22
22
variables must declare the size_of() member function.
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25
#ifndef DRIZZLED_FIELD_H
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26
#define DRIZZLED_FIELD_H
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28
#include <drizzled/sql_error.h>
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#include <drizzled/type/decimal.h>
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#include <drizzled/key_map.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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#include <drizzled/charset_info.h>
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#include <drizzled/item_result.h>
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#include <drizzled/charset_info.h>
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#include <drizzled/visibility.h>
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36
#define DATETIME_DEC 6
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37
#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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52
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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class DRIZZLED_API Field
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/* Prevent use of these */
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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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Field(const Item &); /* Prevent use of these */
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62
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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bool isUnsigned() const
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return flags & UNSIGNED_FLAG;
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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
174
105
value. This means that the type of the field is just a guess, and the type
177
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@see create_tmp_field_from_item
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109
@see Item_type_holder::get_real_type
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bool is_created_from_null_item;
182
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
118
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 type::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.
217
Needs to be changed if/when we want to support different time formats.
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virtual int store_time(type::Time <ime, type::timestamp_t t_type);
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virtual double val_real() const=0;
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virtual int64_t val_int() const =0;
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virtual type::Decimal *val_decimal(type::Decimal *) const;
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String *val_str_internal(String *str) const
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return val_str(str, str);
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virtual int store_decimal(const my_decimal *d)=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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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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190
virtual bool eq(Field *field);
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* Returns true if the fields are equally defined
291
* true This Field is equally defined to supplied Field
293
* false This Field is NOT equally defined to supplied Field
295
191
virtual bool eq_def(Field *field);
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virtual bool is_timestamp() const
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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,
305
* 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;
310
* 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
203
table, which is located on disk).
314
205
virtual uint32_t pack_length_in_rec() const;
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* Return the "real size" of the data in memory.
318
* For varstrings, this does _not_ include the length bytes.
206
virtual int compatible_field_size(uint32_t field_metadata);
207
virtual uint32_t pack_length_from_metadata(uint32_t field_metadata);
210
This method is used to return the size of the data in a row-based
211
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)
213
from compatible_field_size() which uses this function in the comparison.
214
The default value for field metadata for fields that do not have
215
metadata is 0. Thus, 0 == 0 means the fields are compatible in size.
217
Note: While most classes that override this method return pack_length(),
218
the classes Field_varstring, and Field_blob return
219
field_length + 1, field_length, and pack_length_no_ptr() respectfully.
221
virtual uint32_t row_pack_length();
222
virtual int save_field_metadata(unsigned char *first_byte);
225
data_length() return the "real size" of the data in memory.
226
For varstrings, this does _not_ include the length bytes.
320
228
virtual uint32_t data_length();
322
* Returns the number of bytes actually used to store the data
323
* of the field. So for a varstring it includes both lenght byte(s) and
324
* string data, and anything after data_length() bytes are unused.
230
used_length() returns the number of bytes actually used to store the data
231
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();
327
235
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) const;
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bool is_real_null(ptrdiff_t row_offset= 0) const;
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bool is_null_in_record(const unsigned char *record) const;
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bool is_null_in_record_with_offset(ptrdiff_t offset) const;
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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 maybe_null(void) const;
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bool real_maybe_null(void) const;
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virtual void make_field(SendField *);
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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(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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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
301
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
380
* 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
382
* use field->val_int() for comparison. Used to optimize clauses like
383
* '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
310
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
312
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,
396
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uint32_t new_null_bit);
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/** This is used to generate a field in Table from TableShare */
398
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)
402
null_ptr= null_ptr_arg;
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null_bit= null_bit_arg;
325
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*);
330
ptr=ADD_TO_PTR(ptr,ptr_diff, unsigned char*);
410
null_ptr= ADD_TO_PTR(null_ptr,ptr_diff,unsigned char*);
412
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)
418
buff.append(ptr,length);
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virtual void set_image(const unsigned char *buff,uint32_t length, const CHARSET_INFO * const)
422
memcpy(ptr,buff,length);
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* Copy a field part into an output buffer.
430
* This function makes a copy of field part of size equal to or
431
* less than "length" parameter value.
432
* For fields of string types (VARCHAR, TEXT) the rest of buffer
433
* is padded by zero byte.
435
* @param output buffer
436
* @param output buffer size
440
* 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
442
* characters have maximal possible size (mbmaxlen). In the other words,
443
* "length" parameter is a number of characters multiplied by
444
* field_charset->mbmaxlen.
447
* Number of copied bytes (excluding padded zero bytes -- see above).
449
virtual uint32_t get_key_image(unsigned char *buff, uint32_t length)
332
null_ptr=ADD_TO_PTR(null_ptr,ptr_diff,unsigned char*);
334
virtual void get_image(unsigned char *buff, uint32_t length,
335
const CHARSET_INFO * const)
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{ memcpy(buff,ptr,length); }
337
virtual void get_image(std::basic_string<unsigned char> &buff,
339
const CHARSET_INFO * const)
340
{ buff.append(ptr,length); }
341
virtual void set_image(const unsigned char *buff,uint32_t length,
342
const CHARSET_INFO * const)
343
{ memcpy(ptr,buff,length); }
347
Copy a field part into an output buffer.
350
Field::get_key_image()
351
buff [out] output buffer
352
length output buffer size
353
type itMBR for geometry blobs, otherwise itRAW
356
This function makes a copy of field part of size equal to or
357
less than "length" parameter value.
358
For fields of string types (CHAR, VARCHAR, TEXT) the rest of buffer
359
is padded by zero byte.
362
For variable length character fields (i.e. UTF-8) the "length"
363
parameter means a number of output buffer bytes as if all field
364
characters have maximal possible size (mbmaxlen). In the other words,
365
"length" parameter is a number of characters multiplied by
366
field_charset->mbmaxlen.
369
Number of copied bytes (excluding padded zero bytes -- see above).
372
virtual uint32_t get_key_image(unsigned char *buff, uint32_t length, imagetype)
451
374
get_image(buff, length, &my_charset_bin);
454
virtual uint32_t get_key_image(std::basic_string<unsigned char> &buff, uint32_t length)
377
virtual uint32_t get_key_image(std::basic_string<unsigned char> &buff,
378
uint32_t length, imagetype)
456
380
get_image(buff, length, &my_charset_bin);
459
383
virtual void set_key_image(const unsigned char *buff,uint32_t length)
461
set_image(buff,length, &my_charset_bin);
463
int64_t val_int_offset(uint32_t row_offset)
384
{ set_image(buff,length, &my_charset_bin); }
385
inline int64_t val_int_offset(uint32_t row_offset)
466
388
int64_t tmp=val_int();
471
int64_t val_int_internal(const unsigned char *new_ptr)
393
inline int64_t val_int(const unsigned char *new_ptr)
473
395
unsigned char *old_ptr= ptr;
474
ptr= const_cast<unsigned char*>(new_ptr);
475
int64_t return_value= val_int();
396
int64_t return_value;
397
ptr= (unsigned char*) new_ptr;
398
return_value= val_int();
477
400
return return_value;
480
String *val_str_internal(String *str, const unsigned char *new_ptr)
402
inline String *val_str(String *str, const unsigned char *new_ptr)
482
404
unsigned char *old_ptr= ptr;
483
ptr= const_cast<unsigned char*>(new_ptr);
484
val_str_internal(str);
405
ptr= (unsigned char*) new_ptr;
490
Pack the field into a format suitable for storage and transfer.
492
To implement packing functionality, only the virtual function
493
should be overridden. The other functions are just convenience
494
functions and hence should not be overridden.
496
The value of <code>low_byte_first</code> is dependent on how the
497
packed data is going to be used: for local use, e.g., temporary
498
store on disk or in memory, use the native format since that is
499
faster. For data that is going to be transfered to other machines
500
(e.g., when writing data to the binary log), data should always be
501
stored in little-endian format.
503
@note The default method for packing fields just copy the raw bytes
504
of the record into the destination, but never more than
505
<code>max_length</code> characters.
508
Pointer to memory area where representation of field should be put.
511
Pointer to memory area where record representation of field is
515
Maximum length of the field, as given in the column definition. For
516
example, for <code>CHAR(1000)</code>, the <code>max_length</code>
517
is 1000. This information is sometimes needed to decide how to pack
520
@param low_byte_first
521
@c true if integers should be stored little-endian, @c false if
522
native format should be used. Note that for little-endian machines,
523
the value of this flag is a moot point since the native format is
526
411
virtual unsigned char *pack(unsigned char *to,
527
412
const unsigned char *from,
528
413
uint32_t max_length,
531
416
unsigned char *pack(unsigned char *to, const unsigned char *from);
534
Unpack a field from row data.
536
This method is used to unpack a field from a master whose size of
537
the field is less than that of the slave.
539
The <code>param_data</code> parameter is a two-byte integer (stored
540
in the least significant 16 bits of the unsigned integer) usually
541
consisting of two parts: the real type in the most significant byte
542
and a original pack length in the least significant byte.
544
The exact layout of the <code>param_data</code> field is given by
545
the <code>Table_map_log_event::save_field_metadata()</code>.
547
This is the default method for unpacking a field. It just copies
548
the memory block in byte order (of original pack length bytes or
549
length of field, whichever is smaller).
551
@param to Destination of the data
552
@param from Source of the data
553
@param param_data Real type and original pack length of the field
556
@param low_byte_first
557
If this flag is @c true, all composite entities (e.g., lengths)
558
should be unpacked in little-endian format; otherwise, the entities
559
are unpacked in native order.
561
@return New pointer into memory based on from + length of the data
563
418
virtual const unsigned char *unpack(unsigned char* to,
564
419
const unsigned char *from,
565
420
uint32_t param_data,
586
446
return unpack(to, from, max_length, low_byte_first);
448
virtual uint32_t packed_col_length(const unsigned char *to, uint32_t length);
588
449
virtual uint32_t max_packed_col_length(uint32_t max_length)
593
uint32_t offset(const unsigned char *record)
450
{ return max_length;}
452
virtual int pack_cmp(const unsigned char *a,const unsigned char *b,
453
uint32_t key_length_arg,
454
bool insert_or_update);
455
virtual int pack_cmp(const unsigned char *b,
456
uint32_t key_length_arg,
457
bool insert_or_update);
459
uint32_t offset(unsigned char *record)
595
461
return (uint32_t) (ptr - record);
597
463
void copy_from_tmp(int offset);
598
uint32_t fill_cache_field(CacheField *copy);
599
virtual bool get_date(type::Time <ime,uint32_t fuzzydate) const;
600
virtual bool get_time(type::Time <ime) const;
464
uint32_t fill_cache_field(struct st_cache_field *copy);
465
virtual bool get_date(DRIZZLE_TIME *ltime,uint32_t fuzzydate);
466
virtual bool get_time(DRIZZLE_TIME *ltime);
601
467
virtual const CHARSET_INFO *charset(void) const { return &my_charset_bin; }
602
468
virtual const CHARSET_INFO *sort_charset(void) const { return charset(); }
603
469
virtual bool has_charset(void) const { return false; }
604
470
virtual void set_charset(const CHARSET_INFO * const)
606
472
virtual enum Derivation derivation(void) const
608
return DERIVATION_IMPLICIT;
473
{ return DERIVATION_IMPLICIT; }
610
474
virtual void set_derivation(enum Derivation)
613
Produce warning or note about data saved into field.
615
@param level - level of message (Note/Warning/Error)
616
@param code - error code of message to be produced
617
@param cuted_increment - whenever we should increase cut fields count or not
620
This function won't produce warning and increase cut fields counter
621
if count_cuted_fields == CHECK_FIELD_IGNORE for current thread.
623
if count_cuted_fields == CHECK_FIELD_IGNORE then we ignore notes.
624
This allows us to avoid notes in optimisation, like convert_constant_item().
627
1 if count_cuted_fields == CHECK_FIELD_IGNORE and error level is not NOTE
631
bool set_warning(DRIZZLE_ERROR::enum_warning_level,
632
drizzled::error_t code,
476
bool set_warning(DRIZZLE_ERROR::enum_warning_level, unsigned int code,
633
477
int cuted_increment);
635
Produce warning or note about datetime string data saved into field.
637
@param level level of message (Note/Warning/Error)
638
@param code error code of message to be produced
639
@param str string value which we tried to save
640
@param str_length length of string which we tried to save
641
@param ts_type type of datetime value (datetime/date/time)
642
@param cuted_increment whenever we should increase cut fields count or not
645
This function will always produce some warning but won't increase cut
646
fields counter if count_cuted_fields ==FIELD_CHECK_IGNORE for current
649
void set_datetime_warning(DRIZZLE_ERROR::enum_warning_level,
650
drizzled::error_t code,
653
type::timestamp_t ts_type,
654
int cuted_increment);
656
Produce warning or note about integer datetime value 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 numeric value which we tried to save
661
@param ts_type type of datetime value (datetime/date/time)
662
@param cuted_increment whenever we should increase cut fields count or not
665
This function will always produce some warning but won't increase cut
666
fields counter if count_cuted_fields == FIELD_CHECK_IGNORE for current
669
void set_datetime_warning(DRIZZLE_ERROR::enum_warning_level,
670
drizzled::error_t code,
672
type::timestamp_t ts_type,
673
int cuted_increment);
675
Produce warning or note about double datetime data saved into field.
677
@param level level of message (Note/Warning/Error)
678
@param code error code of message to be produced
679
@param nr double value which we tried to save
680
@param ts_type type of datetime value (datetime/date/time)
683
This function will always produce some warning but won't increase cut
684
fields counter if count_cuted_fields == FIELD_CHECK_IGNORE for current
687
void set_datetime_warning(DRIZZLE_ERROR::enum_warning_level,
688
const drizzled::error_t code,
690
type::timestamp_t ts_type);
691
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)
693
488
return (op_result == E_DEC_OVERFLOW);
696
Process decimal library return codes and issue warnings for overflow and
699
@param op_result decimal library return code (E_DEC_* see include/decimal.h)
702
E_DEC_OVERFLOW there was overflow
703
E_DEC_TRUNCATED there was truncation
705
0 no error or there was some other error except overflow or truncation
707
490
int warn_if_overflow(int op_result);
708
491
void init(Table *table_arg);
710
493
/* maximum possible display length */
711
494
virtual uint32_t max_display_length()= 0;
713
virtual uint32_t is_equal(CreateField *new_field);
715
Conversion from decimal to int64_t with checking overflow and
716
setting correct value (min/max) in case of overflow.
718
@param val value which have to be converted
719
@param unsigned_flag type of integer in which we convert val
720
@param err variable to pass error code
723
value converted from val
725
int64_t convert_decimal2int64_t(const type::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,
728
500
/* The max. number of characters */
729
uint32_t char_length() const
501
inline uint32_t char_length() const
731
503
return field_length / charset()->mbmaxlen;
734
enum column_format_type column_format() const
506
inline enum column_format_type column_format() const
736
508
return (enum column_format_type)
737
509
((flags >> COLUMN_FORMAT_FLAGS) & COLUMN_FORMAT_MASK);
741
virtual void hash(uint32_t *nr, uint32_t *nr2) const;
513
virtual void hash(uint32_t *nr, uint32_t *nr2);
742
514
friend bool reopen_table(Session *,Table *,bool);
744
friend class CopyField;
515
friend int cre_myisam(char * name, register Table *form, uint32_t options,
516
uint64_t auto_increment_value);
517
friend class Copy_field;
745
518
friend class Item_avg_field;
746
519
friend class Item_std_field;
747
520
friend class Item_sum_num;
754
527
friend class Item_sum_max;
755
528
friend class Item_func_group_concat;
757
bool isReadSet() const;
759
void setReadSet(bool arg= true);
760
void setWriteSet(bool arg= true);
764
void pack_num(uint64_t arg, unsigned char *destination= NULL);
765
void pack_num(uint32_t arg, unsigned char *destination= NULL);
766
uint64_t unpack_num(uint64_t &destination, const unsigned char *arg= NULL) const;
767
uint32_t unpack_num(uint32_t &destination, const unsigned char *arg= NULL) const;
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;
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
772
inline bool isDateTime(const enum_field_types &arg)
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
776
case DRIZZLE_TYPE_DATE:
777
case DRIZZLE_TYPE_DATETIME:
778
case DRIZZLE_TYPE_MICROTIME:
779
case DRIZZLE_TYPE_TIME:
780
case DRIZZLE_TYPE_TIMESTAMP:
783
case DRIZZLE_TYPE_BLOB:
784
case DRIZZLE_TYPE_BOOLEAN:
785
case DRIZZLE_TYPE_DECIMAL:
786
case DRIZZLE_TYPE_DOUBLE:
787
case DRIZZLE_TYPE_ENUM:
788
case DRIZZLE_TYPE_LONG:
789
case DRIZZLE_TYPE_LONGLONG:
790
case DRIZZLE_TYPE_NULL:
791
case DRIZZLE_TYPE_UUID:
792
case DRIZZLE_TYPE_VARCHAR:
611
return (enum column_format_type)
612
((flags >> COLUMN_FORMAT_FLAGS) & COLUMN_FORMAT_MASK);
802
std::ostream& operator<<(std::ostream& output, const Field &field);
804
} /* namespace drizzled */
806
/** @TODO Why is this in the middle of the file???*/
807
#include <drizzled/create_field.h>
813
* A class for sending field information to a client.
817
* Send_field is basically a stripped-down POD class for
818
* representing basic information about a field...
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
823
636
const char *db_name;
824
const char *table_name;
825
const char *org_table_name;
826
const char *col_name;
827
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;
832
641
enum_field_types type;
647
A class for quick copying data to fields
650
class Copy_field :public Sql_alloc {
652
Convenience definition of a copy function returned by
655
typedef void Copy_func(Copy_field*);
656
Copy_func *get_copy_func(Field *to, Field *from);
658
unsigned char *from_ptr,*to_ptr;
659
unsigned char *from_null_ptr,*to_null_ptr;
661
uint32_t from_bit,to_bit;
662
uint32_t from_length,to_length;
663
Field *from_field,*to_field;
664
String tmp; // For items
668
void set(Field *to,Field *from,bool save); // Field to field
669
void set(unsigned char *to,Field *from); // Field to string
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);
836
682
uint32_t pack_length_to_packflag(uint32_t type);
683
enum_field_types get_blob_type_from_length(uint32_t length);
837
684
uint32_t calc_pack_length(enum_field_types type,uint32_t length);
838
685
int set_field_to_null(Field *field);
839
686
int set_field_to_null_with_conversions(Field *field, bool no_conversions);
842
* Tests if the given string contains important data:
843
* not spaces for character string, or any data for binary string.
845
* @param pointer to the character set to use
846
* @param String to test
850
* false - If string does not have important data
852
* true - If string has some important data
854
bool test_if_important_data(const CHARSET_INFO * const cs,
858
} /* namespace drizzled */
690
test_if_important_data(const CHARSET_INFO * const cs,
860
695
#endif /* DRIZZLED_FIELD_H */