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#include <drizzled/global.h>
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#include <drizzled/message/replication.pb.h>
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using namespace drizzled;
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* @file Example application for reading change records and transactions
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static void printInsert(const message::Command &container,
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const message::InsertRecord &record)
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cout << "INSERT INTO `" << container.schema() << "`.`"
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<< container.table() << "` (";
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int32_t num_fields= record.insert_field_size();
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for (x= 0; x < num_fields; x++)
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const message::Table::Field f= record.insert_field(x);
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cout << "`" << f.name() << "`";
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* There may be an INSERT VALUES (),() type statement. We know the
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* number of records is equal to the field_values array size divided
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* by the number of fields.
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* So, we do an inner and an outer loop. Outer loop is on the number
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* of records and the inner loop on the number of fields. In this way,
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* we know that record.field_values(outer_loop * num_fields) + inner_loop))
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* always gives us our correct field value.
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int32_t num_records= (record.insert_value_size() / num_fields);
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for (x= 0; x < num_records; x++)
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for (y= 0; y < num_fields; y++)
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cout << "\"" << record.insert_value((x * num_fields) + y) << "\"";
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static void printDeleteWithPK(const message::Command &container,
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const message::DeleteRecord &record)
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cout << "DELETE FROM `" << container.schema() << "`.`" << container.table() << "`";
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int32_t num_where_fields= record.where_field_size();
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* Make sure we catch anywhere we're not aligning the fields with
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* the field_values arrays...
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assert(num_where_fields == record.where_value_size());
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for (x= 0; x < num_where_fields; x++)
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cout << " AND "; /* Always AND condition with a multi-column PK */
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const message::Table::Field f= record.where_field(x);
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/* Always equality conditions */
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cout << "`" << f.name() << "` = \"" << record.where_value(x) << "\"";
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static void printUpdateWithPK(const message::Command &container,
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const message::UpdateRecord &record)
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int32_t num_update_fields= record.update_field_size();
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cout << "UPDATE `" << container.schema() << "`.`" << container.table() << "` SET ";
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for (x= 0;x < num_update_fields; x++)
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message::Table::Field f= record.update_field(x);
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cout << "`" << f.name() << "` = \"" << record.after_value(x) << "\"";
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int32_t num_where_fields= record.where_field_size();
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* Make sure we catch anywhere we're not aligning the fields with
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* the field_values arrays...
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assert(num_where_fields == record.where_value_size());
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for (x= 0;x < num_where_fields; x++)
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cout << " AND "; /* Always AND condition with a multi-column PK */
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const message::Table::Field f= record.where_field(x);
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/* Always equality conditions */
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cout << "`" << f.name() << "` = \"" << record.where_value(x) << "\"";
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static void printTransaction(const message::Transaction &transaction)
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cout << "/* Start Time: " << transaction.start_timestamp() << " */ START TRANSACTION;"<< endl;
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for (e_size= 0; e_size < transaction.command_size(); e_size++)
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const message::Command command= transaction.command(e_size);
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message::TransactionContext trx= command.transaction_context();
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cout << "/* SID: " << trx.server_id() << " XID: " << trx.transaction_id() << " */ ";
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switch (command.type())
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case message::Command::START_TRANSACTION:
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cout << "START TRANSACTION;";
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case message::Command::COMMIT:
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case message::Command::ROLLBACK:
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case message::Command::INSERT:
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printInsert(command, command.insert_record());
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case message::Command::DELETE:
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printDeleteWithPK(command, command.delete_record());
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case message::Command::UPDATE:
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printUpdateWithPK(command, command.update_record());
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cout << "/* Commit Time: " << transaction.end_timestamp() << " */ COMMIT;" << endl;
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int main(int argc, char* argv[])
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GOOGLE_PROTOBUF_VERIFY_VERSION;
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cerr << "Usage: " << argv[0] << " TRANSACTION_LOG" << endl;
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message::Transaction transaction;
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if ((file= open(argv[1], O_RDONLY)) == -1)
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cerr << "Can not open file: " << argv[1] << endl;
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if (read(file, &length, sizeof(uint64_t)) != sizeof(uint64_t))
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if (length > SIZE_MAX)
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cerr << "Attempted to read record bigger than SIZE_MAX" << endl;
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temp_buffer= (char *)realloc(buffer, (size_t)length);
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if (temp_buffer == NULL)
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cerr << "Memory allocation failure trying to allocate " << length << " bytes." << endl;
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memset(temp_buffer, 0, (size_t)length);
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size_t read_bytes= 0;
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/* Read the transaction */
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if ((read_bytes= read(file, buffer, (size_t)length)) != (size_t)length)
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cerr << "Could not read entire transaction. Read " << read_bytes << " bytes instead of " << length << " bytes." << endl;
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transaction.ParseFromArray(buffer, (int) length);
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/* Print the transaction */
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printTransaction(transaction);