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#ifndef DRIZZLED_FIELD_H
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#define DRIZZLED_FIELD_H
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#include "drizzled/sql_error.h"
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#include "drizzled/decimal.h"
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#include "drizzled/key_map.h"
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#include "drizzled/sql_list.h"
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#include "drizzled/structs.h"
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#include "drizzled/charset_info.h"
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#include "drizzled/item_result.h"
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#include <drizzled/sql_error.h>
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#include <drizzled/my_decimal.h>
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#include <drizzled/sql_bitmap.h>
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#include <drizzled/sql_list.h>
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/* System-wide common data structures */
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#include <drizzled/structs.h>
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#define DATETIME_DEC 6
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#define DOUBLE_TO_STRING_CONVERSION_BUFFER_SIZE FLOATING_POINT_BUFFER
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#define ASSERT_COLUMN_MARKED_FOR_READ assert(!getTable() || (getTable()->read_set == NULL || isReadSet()))
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#define ASSERT_COLUMN_MARKED_FOR_WRITE assert(!getTable() || (getTable()->write_set == NULL || isWriteSet()))
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#define ASSERT_COLUMN_MARKED_FOR_READ assert(getTable())
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#define ASSERT_COLUMN_MARKED_FOR_WRITE assert(getTable())
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typedef struct st_typelib TYPELIB;
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const uint32_t max_field_size= (uint32_t) 4294967295U;
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class virtual_column_info;
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struct st_cache_field;
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int field_conv(Field *to,Field *from);
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* Class representing a Field in a Table
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* The value stored in the Field object is stored in the
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* unsigned char pointer member variable called ptr. The
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* val_xxx() methods retrieve this raw byte value and
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* convert the byte into the appropriate output (int, decimal, etc).
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* The store_xxx() methods take various input and convert
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* the input into the raw bytes stored in the ptr member variable.
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inline uint32_t get_enum_pack_length(int elements)
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return elements < 256 ? 1 : 2;
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/* Prevent use of these */
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Field(const Item &); /* Prevent use of these */
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void operator=(Field &);
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unsigned char *ptr; /**< Position to field in record. Stores raw field value */
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unsigned char *null_ptr; /**< Byte where null_bit is */
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* Pointer to the Table object containing this Field
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* @note You can use table->in_use as replacement for current_session member
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* only inside of val_*() and store() members (e.g. you can't use it in cons)
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Table *getTable() const
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void setTable(Table *table_arg)
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Table *orig_table; /**< Pointer to the original Table. @TODO What is "the original table"? */
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const char *field_name; /**< Name of the field */
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LEX_STRING comment; /**< A comment about the field */
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/** The field is part of the following keys */
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key_map part_of_key_not_clustered;
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key_map part_of_sortkey;
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We use three additional unireg types for TIMESTAMP for hysterical
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raisins and limitations in the MySQL FRM file format.
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A good TODO is to clean this up as we can support just about
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anything in the table proto message now.
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uint32_t field_length; /**< Length of this field in bytes */
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uint16_t field_index; /**< Index of this Field in Table::fields array */
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uint16_t position() const
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void setPosition(uint32_t arg)
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unsigned char null_bit; /**< Bit used to test null bit */
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static void *operator new(size_t size) {return sql_alloc(size); }
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static void *operator new(size_t size, MEM_ROOT *mem_root)
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{ return (void*) alloc_root(mem_root, (uint32_t) size); }
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static void operator delete(void *, size_t)
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{ TRASH(ptr_arg, size); }
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unsigned char *ptr; // Position to field in record
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unsigned char *null_ptr; // Byte where null_bit is
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Note that you can use table->in_use as replacement for current_session member
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only inside of val_*() and store() members (e.g. you can't use it in cons)
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Table *table; // Pointer for table
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Table *orig_table; // Pointer to original table
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const char **table_name, *field_name;
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/* Field is part of the following keys */
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key_map key_start, part_of_key, part_of_key_not_clustered;
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key_map part_of_sortkey;
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We use three additional unireg types for TIMESTAMP to overcome limitation
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of current binary format of .frm file. We'd like to be able to support
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NOW() as default and on update value for such fields but unable to hold
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this info anywhere except unireg_check field. This issue will be resolved
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in more clean way with transition to new text based .frm format.
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See also comment for Field_timestamp::Field_timestamp().
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TIMESTAMP_DN_FIELD, TIMESTAMP_UN_FIELD, TIMESTAMP_DNUN_FIELD};
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enum imagetype { itRAW, itMBR};
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uint32_t field_length; // Length of field
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uint16_t field_index; // field number in fields array
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unsigned char null_bit; // Bit used to test null bit
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If true, this field was created in create_tmp_field_from_item from a NULL
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value. This means that the type of the field is just a guess, and the type
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@see create_tmp_field_from_item
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@see Item_type_holder::get_real_type
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bool is_created_from_null_item;
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static void *operator new(size_t size);
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static void *operator new(size_t size, memory::Root *mem_root);
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static void operator delete(void *, size_t)
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static void operator delete(void *, memory::Root *)
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/* Virtual column data */
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virtual_column_info *vcol_info;
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Indication that the field is physically stored in tables
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rather than just generated on SQL queries.
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As of now, false can only be set for generated-only virtual columns.
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Field(unsigned char *ptr_arg,
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unsigned char *null_ptr_arg,
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unsigned char null_bit_arg,
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utype unireg_check_arg,
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Field(unsigned char *ptr_arg,uint32_t length_arg,unsigned char *null_ptr_arg,
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unsigned char null_bit_arg, utype unireg_check_arg,
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const char *field_name_arg);
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virtual ~Field() {}
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bool hasDefault() const
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return not (flags & NO_DEFAULT_VALUE_FLAG);
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/* Store functions returns 1 on overflow and -1 on fatal error */
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virtual int store(const char *to,
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virtual int store(const char *to, uint32_t length,
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const CHARSET_INFO * const cs)=0;
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virtual int store(double nr)=0;
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virtual int store(int64_t nr, bool unsigned_val)=0;
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virtual int store_decimal(const my_decimal *d)=0;
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int store_and_check(enum_check_fields check_level,
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const CHARSET_INFO * const cs);
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This is called when storing a date in a string.
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Needs to be changed if/when we want to support different time formats.
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virtual int store_time(DRIZZLE_TIME *ltime, enum enum_drizzle_timestamp_type t_type);
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virtual double val_real()=0;
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virtual int64_t val_int()=0;
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int store(const char *to, uint32_t length,
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const CHARSET_INFO * const cs,
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enum_check_fields check_level);
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virtual int store_time(DRIZZLE_TIME *ltime,
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enum enum_drizzle_timestamp_type t_type);
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virtual double val_real(void)=0;
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virtual int64_t val_int(void)=0;
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virtual my_decimal *val_decimal(my_decimal *);
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String *val_str_internal(String *str)
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return val_str(str, str);
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inline String *val_str(String *str) { return val_str(str, str); }
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val_str(buf1, buf2) gets two buffers and should use them as follows:
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if it needs a temp buffer to convert result to string - use buf1
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static Item_result result_merge_type(enum_field_types);
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virtual bool eq(Field *field);
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* Returns true if the fields are equally defined
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* true This Field is equally defined to supplied Field
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* false This Field is NOT equally defined to supplied Field
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virtual bool eq_def(Field *field);
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* Returns size (in bytes) used to store field data in memory
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* (i.e. it returns the maximum size of the field in a row of the table,
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* which is located in RAM).
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pack_length() returns size (in bytes) used to store field data in memory
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(i.e. it returns the maximum size of the field in a row of the table,
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which is located in RAM).
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virtual uint32_t pack_length() const;
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* Returns size (in bytes) used to store field data on
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* storage (i.e. it returns the maximal size of the field in a row of the
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* table, which is located on disk).
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pack_length_in_rec() returns size (in bytes) used to store field data on
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storage (i.e. it returns the maximal size of the field in a row of the
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table, which is located on disk).
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virtual uint32_t pack_length_in_rec() const;
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* Return the "real size" of the data in memory.
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* For varstrings, this does _not_ include the length bytes.
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virtual int compatible_field_size(uint32_t field_metadata);
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virtual uint32_t pack_length_from_metadata(uint32_t field_metadata);
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This method is used to return the size of the data in a row-based
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replication row record. The default implementation of returning 0 is
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designed to allow fields that do not use metadata to return true (1)
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from compatible_field_size() which uses this function in the comparison.
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The default value for field metadata for fields that do not have
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metadata is 0. Thus, 0 == 0 means the fields are compatible in size.
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Note: While most classes that override this method return pack_length(),
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the classes Field_varstring, and Field_blob return
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field_length + 1, field_length, and pack_length_no_ptr() respectfully.
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virtual uint32_t row_pack_length();
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virtual int save_field_metadata(unsigned char *first_byte);
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data_length() return the "real size" of the data in memory.
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For varstrings, this does _not_ include the length bytes.
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virtual uint32_t data_length();
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* Returns the number of bytes actually used to store the data
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* of the field. So for a varstring it includes both lenght byte(s) and
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* string data, and anything after data_length() bytes are unused.
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used_length() returns the number of bytes actually used to store the data
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of the field. So for a varstring it includes both lenght byte(s) and
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string data, and anything after data_length() bytes are unused.
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virtual uint32_t used_length();
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virtual uint32_t sort_length() const;
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virtual uint32_t size_of() const =0;
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bool is_null(ptrdiff_t row_offset= 0);
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bool is_real_null(ptrdiff_t row_offset= 0);
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bool is_null(my_ptrdiff_t row_offset= 0);
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bool is_real_null(my_ptrdiff_t row_offset= 0);
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bool is_null_in_record(const unsigned char *record);
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bool is_null_in_record_with_offset(ptrdiff_t offset);
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void set_null(ptrdiff_t row_offset= 0);
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void set_notnull(ptrdiff_t row_offset= 0);
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bool is_null_in_record_with_offset(my_ptrdiff_t offset);
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void set_null(my_ptrdiff_t row_offset= 0);
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void set_notnull(my_ptrdiff_t row_offset= 0);
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bool maybe_null(void);
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bool real_maybe_null(void);
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virtual void make_field(SendField *);
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LAST_NULL_BYTE_UNDEF= 0
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Find the position of the last null byte for the field.
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Return a pointer to the last byte of the null bytes where the
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field conceptually is placed.
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The position of the last null byte relative to the beginning of
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the record. If the field does not use any bits of the null
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bytes, the value 0 (LAST_NULL_BYTE_UNDEF) is returned.
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size_t last_null_byte() const;
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virtual void make_field(Send_field *);
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virtual void sort_string(unsigned char *buff,uint32_t length)=0;
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virtual bool optimize_range(uint32_t idx, uint32_t part);
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* Returns true for fields which, when compared with constant
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* items, can be casted to int64_t. In this case we will at 'fix_fields'
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* stage cast the constant items to int64_ts and at the execution stage
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* use field->val_int() for comparison. Used to optimize clauses like
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* 'a_column BETWEEN date_const AND date_const'.
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virtual bool can_be_compared_as_int64_t() const
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This should be true for fields which, when compared with constant
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items, can be casted to int64_t. In this case we will at 'fix_fields'
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stage cast the constant items to int64_ts and at the execution stage
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use field->val_int() for comparison. Used to optimize clauses like
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'a_column BETWEEN date_const, date_const'.
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virtual bool can_be_compared_as_int64_t() const { return false; }
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virtual void free() {}
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virtual Field *new_field(memory::Root *root,
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virtual Field *new_field(MEM_ROOT *root, Table *new_table,
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virtual Field *new_key_field(memory::Root *root, Table *new_table,
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unsigned char *new_ptr,
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unsigned char *new_null_ptr,
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virtual Field *new_key_field(MEM_ROOT *root, Table *new_table,
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unsigned char *new_ptr, unsigned char *new_null_ptr,
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uint32_t new_null_bit);
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/** This is used to generate a field in Table from TableShare */
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Field *clone(memory::Root *mem_root, Table *new_table);
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void move_field(unsigned char *ptr_arg,unsigned char *null_ptr_arg,unsigned char null_bit_arg)
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Field *clone(MEM_ROOT *mem_root, Table *new_table);
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inline void move_field(unsigned char *ptr_arg,unsigned char *null_ptr_arg,unsigned char null_bit_arg)
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null_ptr= null_ptr_arg;
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null_bit= null_bit_arg;
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ptr=ptr_arg; null_ptr=null_ptr_arg; null_bit=null_bit_arg;
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void move_field(unsigned char *ptr_arg) { ptr=ptr_arg; }
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virtual void move_field_offset(ptrdiff_t ptr_diff)
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inline void move_field(unsigned char *ptr_arg) { ptr=ptr_arg; }
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virtual void move_field_offset(my_ptrdiff_t ptr_diff)
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ptr= ADD_TO_PTR(ptr,ptr_diff, unsigned char*);
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ptr=ADD_TO_PTR(ptr,ptr_diff, unsigned char*);
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null_ptr= ADD_TO_PTR(null_ptr,ptr_diff,unsigned char*);
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virtual void get_image(unsigned char *buff, uint32_t length, const CHARSET_INFO * const)
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memcpy(buff,ptr,length);
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virtual void get_image(std::basic_string<unsigned char> &buff, uint32_t length, const CHARSET_INFO * const)
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buff.append(ptr,length);
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virtual void set_image(const unsigned char *buff,uint32_t length, const CHARSET_INFO * const)
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memcpy(ptr,buff,length);
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* Copy a field part into an output buffer.
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* This function makes a copy of field part of size equal to or
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* less than "length" parameter value.
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* For fields of string types (VARCHAR, TEXT) the rest of buffer
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* is padded by zero byte.
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* @param output buffer
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* @param output buffer size
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* For variable length character fields (i.e. UTF-8) the "length"
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* parameter means a number of output buffer bytes as if all field
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* characters have maximal possible size (mbmaxlen). In the other words,
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* "length" parameter is a number of characters multiplied by
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* field_charset->mbmaxlen.
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* Number of copied bytes (excluding padded zero bytes -- see above).
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virtual uint32_t get_key_image(unsigned char *buff, uint32_t length)
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null_ptr=ADD_TO_PTR(null_ptr,ptr_diff,unsigned char*);
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virtual void get_image(unsigned char *buff, uint32_t length,
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const CHARSET_INFO * const)
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{ memcpy(buff,ptr,length); }
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virtual void get_image(std::basic_string<unsigned char> &buff,
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const CHARSET_INFO * const)
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{ buff.append(ptr,length); }
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virtual void set_image(const unsigned char *buff,uint32_t length,
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const CHARSET_INFO * const)
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{ memcpy(ptr,buff,length); }
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Copy a field part into an output buffer.
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Field::get_key_image()
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buff [out] output buffer
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length output buffer size
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type itMBR for geometry blobs, otherwise itRAW
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This function makes a copy of field part of size equal to or
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less than "length" parameter value.
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For fields of string types (CHAR, VARCHAR, TEXT) the rest of buffer
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is padded by zero byte.
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For variable length character fields (i.e. UTF-8) the "length"
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parameter means a number of output buffer bytes as if all field
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characters have maximal possible size (mbmaxlen). In the other words,
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"length" parameter is a number of characters multiplied by
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field_charset->mbmaxlen.
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Number of copied bytes (excluding padded zero bytes -- see above).
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virtual uint32_t get_key_image(unsigned char *buff, uint32_t length, imagetype)
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get_image(buff, length, &my_charset_bin);
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virtual uint32_t get_key_image(std::basic_string<unsigned char> &buff, uint32_t length)
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virtual uint32_t get_key_image(std::basic_string<unsigned char> &buff,
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uint32_t length, imagetype)
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get_image(buff, length, &my_charset_bin);
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virtual void set_key_image(const unsigned char *buff,uint32_t length)
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set_image(buff,length, &my_charset_bin);
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int64_t val_int_offset(uint32_t row_offset)
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{ set_image(buff,length, &my_charset_bin); }
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inline int64_t val_int_offset(uint32_t row_offset)
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int64_t tmp=val_int();
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int64_t val_int_internal(const unsigned char *new_ptr)
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inline int64_t val_int(const unsigned char *new_ptr)
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unsigned char *old_ptr= ptr;
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int64_t return_value;
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ptr= const_cast<unsigned char*>(new_ptr);
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ptr= (unsigned char*) new_ptr;
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return_value= val_int();
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return return_value;
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String *val_str_internal(String *str, const unsigned char *new_ptr)
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inline String *val_str(String *str, const unsigned char *new_ptr)
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unsigned char *old_ptr= ptr;
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ptr= const_cast<unsigned char*>(new_ptr);
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val_str_internal(str);
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ptr= (unsigned char*) new_ptr;
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Pack the field into a format suitable for storage and transfer.
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To implement packing functionality, only the virtual function
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should be overridden. The other functions are just convenience
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functions and hence should not be overridden.
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The value of <code>low_byte_first</code> is dependent on how the
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packed data is going to be used: for local use, e.g., temporary
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store on disk or in memory, use the native format since that is
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faster. For data that is going to be transfered to other machines
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(e.g., when writing data to the binary log), data should always be
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stored in little-endian format.
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@note The default method for packing fields just copy the raw bytes
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of the record into the destination, but never more than
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<code>max_length</code> characters.
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Pointer to memory area where representation of field should be put.
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Pointer to memory area where record representation of field is
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Maximum length of the field, as given in the column definition. For
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example, for <code>CHAR(1000)</code>, the <code>max_length</code>
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is 1000. This information is sometimes needed to decide how to pack
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@param low_byte_first
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@c true if integers should be stored little-endian, @c false if
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native format should be used. Note that for little-endian machines,
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the value of this flag is a moot point since the native format is
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virtual unsigned char *pack(unsigned char *to,
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const unsigned char *from,
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uint32_t max_length,
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unsigned char *pack(unsigned char *to, const unsigned char *from);
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Unpack a field from row data.
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This method is used to unpack a field from a master whose size of
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the field is less than that of the slave.
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The <code>param_data</code> parameter is a two-byte integer (stored
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in the least significant 16 bits of the unsigned integer) usually
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consisting of two parts: the real type in the most significant byte
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and a original pack length in the least significant byte.
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The exact layout of the <code>param_data</code> field is given by
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the <code>Table_map_log_event::save_field_metadata()</code>.
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This is the default method for unpacking a field. It just copies
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the memory block in byte order (of original pack length bytes or
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length of field, whichever is smaller).
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@param to Destination of the data
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@param from Source of the data
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@param param_data Real type and original pack length of the field
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@param low_byte_first
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If this flag is @c true, all composite entities (e.g., lengths)
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should be unpacked in little-endian format; otherwise, the entities
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are unpacked in native order.
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@return New pointer into memory based on from + length of the data
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virtual const unsigned char *unpack(unsigned char* to,
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const unsigned char *from,
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uint32_t param_data,
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return unpack(to, from, max_length, low_byte_first);
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virtual uint32_t packed_col_length(const unsigned char *to, uint32_t length);
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virtual uint32_t max_packed_col_length(uint32_t max_length)
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uint32_t offset(const unsigned char *record)
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{ return max_length;}
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virtual int pack_cmp(const unsigned char *a,const unsigned char *b,
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uint32_t key_length_arg,
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bool insert_or_update);
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virtual int pack_cmp(const unsigned char *b,
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uint32_t key_length_arg,
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bool insert_or_update);
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uint32_t offset(unsigned char *record)
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return (uint32_t) (ptr - record);
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void copy_from_tmp(int offset);
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uint32_t fill_cache_field(CacheField *copy);
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uint32_t fill_cache_field(struct st_cache_field *copy);
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virtual bool get_date(DRIZZLE_TIME *ltime,uint32_t fuzzydate);
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virtual bool get_time(DRIZZLE_TIME *ltime);
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virtual const CHARSET_INFO *charset(void) const { return &my_charset_bin; }
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virtual const CHARSET_INFO *sort_charset(void) const { return charset(); }
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virtual bool has_charset(void) const { return false; }
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virtual void set_charset(const CHARSET_INFO * const)
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virtual enum Derivation derivation(void) const
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return DERIVATION_IMPLICIT;
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{ return DERIVATION_IMPLICIT; }
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virtual void set_derivation(enum Derivation)
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Produce warning or note about data saved into field.
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@param level - level of message (Note/Warning/Error)
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@param code - error code of message to be produced
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@param cuted_increment - whenever we should increase cut fields count or not
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This function won't produce warning and increase cut fields counter
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if count_cuted_fields == CHECK_FIELD_IGNORE for current thread.
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if count_cuted_fields == CHECK_FIELD_IGNORE then we ignore notes.
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This allows us to avoid notes in optimisation, like convert_constant_item().
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1 if count_cuted_fields == CHECK_FIELD_IGNORE and error level is not NOTE
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bool set_warning(DRIZZLE_ERROR::enum_warning_level,
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bool set_warning(DRIZZLE_ERROR::enum_warning_level, unsigned int code,
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int cuted_increment);
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Produce warning or note about datetime string data saved into field.
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@param level level of message (Note/Warning/Error)
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@param code error code of message to be produced
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@param str string value which we tried to save
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@param str_length length of string which we tried to save
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@param ts_type type of datetime value (datetime/date/time)
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@param cuted_increment whenever we should increase cut fields count or not
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This function will always produce some warning but won't increase cut
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fields counter if count_cuted_fields ==FIELD_CHECK_IGNORE for current
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void set_datetime_warning(DRIZZLE_ERROR::enum_warning_level,
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enum enum_drizzle_timestamp_type ts_type,
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int cuted_increment);
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Produce warning or note about integer datetime value saved into field.
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@param level level of message (Note/Warning/Error)
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@param code error code of message to be produced
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@param nr numeric value which we tried to save
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@param ts_type type of datetime value (datetime/date/time)
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@param cuted_increment whenever we should increase cut fields count or not
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This function will always produce some warning but won't increase cut
647
fields counter if count_cuted_fields == FIELD_CHECK_IGNORE for current
650
void set_datetime_warning(DRIZZLE_ERROR::enum_warning_level,
653
enum enum_drizzle_timestamp_type ts_type,
654
int cuted_increment);
656
Produce warning or note about double datetime data saved into field.
658
@param level level of message (Note/Warning/Error)
659
@param code error code of message to be produced
660
@param nr double value which we tried to save
661
@param ts_type type of datetime value (datetime/date/time)
664
This function will always produce some warning but won't increase cut
665
fields counter if count_cuted_fields == FIELD_CHECK_IGNORE for current
668
void set_datetime_warning(DRIZZLE_ERROR::enum_warning_level,
671
enum enum_drizzle_timestamp_type ts_type);
672
bool check_overflow(int op_result)
478
void set_datetime_warning(DRIZZLE_ERROR::enum_warning_level, uint32_t code,
479
const char *str, uint32_t str_len,
480
enum enum_drizzle_timestamp_type ts_type, int cuted_increment);
481
void set_datetime_warning(DRIZZLE_ERROR::enum_warning_level, uint32_t code,
482
int64_t nr, enum enum_drizzle_timestamp_type ts_type,
483
int cuted_increment);
484
void set_datetime_warning(DRIZZLE_ERROR::enum_warning_level, const uint32_t code,
485
double nr, enum enum_drizzle_timestamp_type ts_type);
486
inline bool check_overflow(int op_result)
674
488
return (op_result == E_DEC_OVERFLOW);
677
Process decimal library return codes and issue warnings for overflow and
680
@param op_result decimal library return code (E_DEC_* see include/decimal.h)
683
E_DEC_OVERFLOW there was overflow
684
E_DEC_TRUNCATED there was truncation
686
0 no error or there was some other error except overflow or truncation
688
490
int warn_if_overflow(int op_result);
689
491
void init(Table *table_arg);
691
493
/* maximum possible display length */
692
494
virtual uint32_t max_display_length()= 0;
694
virtual uint32_t is_equal(CreateField *new_field);
696
Conversion from decimal to int64_t with checking overflow and
697
setting correct value (min/max) in case of overflow.
699
@param val value which have to be converted
700
@param unsigned_flag type of integer in which we convert val
701
@param err variable to pass error code
704
value converted from val
706
int64_t convert_decimal2int64_t(const my_decimal *val,
496
virtual uint32_t is_equal(Create_field *new_field);
497
/* convert decimal to int64_t with overflow check */
498
int64_t convert_decimal2int64_t(const my_decimal *val, bool unsigned_flag,
709
500
/* The max. number of characters */
710
uint32_t char_length() const
501
inline uint32_t char_length() const
712
503
return field_length / charset()->mbmaxlen;
715
enum column_format_type column_format() const
506
inline enum column_format_type column_format() const
717
508
return (enum column_format_type)
718
509
((flags >> COLUMN_FORMAT_FLAGS) & COLUMN_FORMAT_MASK);
735
527
friend class Item_sum_max;
736
528
friend class Item_func_group_concat;
740
void setReadSet(bool arg= true);
741
void setWriteSet(bool arg= true);
744
std::ostream& operator<<(std::ostream& output, const Field &field);
746
} /* namespace drizzled */
748
/** @TODO Why is this in the middle of the file???*/
749
#include "drizzled/create_field.h"
532
Primitive for implementing last_null_byte().
538
Primitive for the implementation of the last_null_byte()
539
function. This represents the inheritance interface and can be
540
overridden by subclasses.
542
virtual size_t do_last_null_byte() const;
755
* A class for sending field information to a client.
759
* Send_field is basically a stripped-down POD class for
760
* representing basic information about a field...
545
Retrieve the field metadata for fields.
547
This default implementation returns 0 and saves 0 in the metadata_ptr
550
@param metadata_ptr First byte of field metadata
552
@returns 0 no bytes written.
554
virtual int do_save_field_metadata(unsigned char *)
559
Create field class for CREATE TABLE
562
class Create_field :public Sql_alloc
565
const char *field_name;
566
const char *change; // If done with alter table
567
const char *after; // Put column after this one
568
LEX_STRING comment; // Comment for field
569
Item *def; // Default value
570
enum enum_field_types sql_type;
572
At various stages in execution this can be length of field in bytes or
573
max number of characters.
577
The value of `length' as set by parser: is the number of characters
578
for most of the types, or of bytes for BLOBs or numeric types.
580
uint32_t char_length;
581
uint32_t decimals, flags, pack_length, key_length;
582
Field::utype unireg_check;
583
TYPELIB *interval; // Which interval to use
584
TYPELIB *save_interval; // Temporary copy for the above
585
// Used only for UCS2 intervals
586
List<String> interval_list;
587
const CHARSET_INFO *charset;
588
Field *field; // For alter table
590
uint8_t interval_id; // For rea_create_table
591
uint32_t offset,pack_flag;
593
/* Virtual column expression statement */
594
virtual_column_info *vcol_info;
596
Indication that the field is phycically stored in tables
597
rather than just generated on SQL queries.
598
As of now, FALSE can only be set for generated-only virtual columns.
602
Create_field() :after(0) {}
603
Create_field(Field *field, Field *orig_field);
604
/* Used to make a clone of this object for ALTER/CREATE TABLE */
605
Create_field *clone(MEM_ROOT *mem_root) const
606
{ return new (mem_root) Create_field(*this); }
607
void create_length_to_internal_length(void);
609
inline enum column_format_type column_format() const
611
return (enum column_format_type)
612
((flags >> COLUMN_FORMAT_FLAGS) & COLUMN_FORMAT_MASK);
615
/* Init for a tmp table field. To be extended if need be. */
616
void init_for_tmp_table(enum_field_types sql_type_arg,
617
uint32_t max_length, uint32_t decimals,
618
bool maybe_null, bool is_unsigned);
620
bool init(Session *session, char *field_name, enum_field_types type, char *length,
621
char *decimals, uint32_t type_modifier, Item *default_value,
622
Item *on_update_value, LEX_STRING *comment, char *change,
623
List<String> *interval_list, const CHARSET_INFO * const cs,
624
uint32_t uint_geom_type,
625
enum column_format_type column_format,
626
virtual_column_info *vcol_info);
631
A class for sending info to the client
765
636
const char *db_name;
766
const char *table_name;
767
const char *org_table_name;
768
const char *col_name;
769
const char *org_col_name;
637
const char *table_name,*org_table_name;
638
const char *col_name,*org_col_name;
640
uint32_t charsetnr, flags, decimals;
774
641
enum_field_types type;
779
* A class for quick copying data to fields
781
class CopyField :public memory::SqlAlloc
647
A class for quick copying data to fields
650
class Copy_field :public Sql_alloc {
784
652
Convenience definition of a copy function returned by
787
typedef void Copy_func(CopyField*);
655
typedef void Copy_func(Copy_field*);
788
656
Copy_func *get_copy_func(Field *to, Field *from);
790
unsigned char *from_ptr;
791
unsigned char *to_ptr;
792
unsigned char *from_null_ptr;
793
unsigned char *to_null_ptr;
658
unsigned char *from_ptr,*to_ptr;
659
unsigned char *from_null_ptr,*to_null_ptr;
797
uint32_t from_length;
661
uint32_t from_bit,to_bit;
662
uint32_t from_length,to_length;
663
Field *from_field,*to_field;
801
664
String tmp; // For items
805
668
void set(Field *to,Field *from,bool save); // Field to field
806
669
void set(unsigned char *to,Field *from); // Field to string
807
void (*do_copy)(CopyField *);
808
void (*do_copy2)(CopyField *); // Used to handle null values
670
void (*do_copy)(Copy_field *);
671
void (*do_copy2)(Copy_field *); // Used to handle null values
675
Field *make_field(TABLE_SHARE *share, MEM_ROOT *root, unsigned char *ptr, uint32_t field_length,
676
unsigned char *null_pos, unsigned char null_bit,
677
uint32_t pack_flag, enum_field_types field_type,
678
const CHARSET_INFO * cs,
679
Field::utype unireg_check,
680
TYPELIB *interval, const char *field_name);
811
682
uint32_t pack_length_to_packflag(uint32_t type);
683
enum_field_types get_blob_type_from_length(uint32_t length);
812
684
uint32_t calc_pack_length(enum_field_types type,uint32_t length);
813
685
int set_field_to_null(Field *field);
814
686
int set_field_to_null_with_conversions(Field *field, bool no_conversions);
817
* Tests if the given string contains important data:
818
* not spaces for character string, or any data for binary string.
820
* @param pointer to the character set to use
821
* @param String to test
825
* false - If string does not have important data
827
* true - If string has some important data
829
bool test_if_important_data(const CHARSET_INFO * const cs,
833
} /* namespace drizzled */
690
test_if_important_data(const CHARSET_INFO * const cs,
835
695
#endif /* DRIZZLED_FIELD_H */