This page describes the public data structures used by MariaDB Connector/C.
The MYSQL structure represents one database connection and is used by most of MariaDB Connector/C's API functions. The MYSQL structure needs to be allocated and initialized by the mysql_init() API function. It will be released by the mysql_close() function.
The MYSQL structure should be considered as opaque; copying or changing values of its members might produce unexpected results, errors or program crashes.
The MYSQL_RES structure represents a result set which contains data and metadata information. It will be returned by the mysql_use_result(), mysql_store_result() and mysql_stmt_result_metadata() API functions and needs to be released by mysql_free_result().
The MYSQL_RES structure should be considered as opaque; copying or changing values of its members might produce unexpected results, errors or program crashes.
MYSQL_ROW represents an array of character pointers, pointing to the columns of the actual data row. Data will be received by the mysql_fetch_row() function. The size of the array is the number of columns for the current row.
The MYSQL_STMT structure represents a prepared statement handle and is used by MariaDB Connector/C's prepared statement API functions. The MYSQL_STMT structure needs to be allocated and initialized by the mysql_stmt_init() function and needs to be released by the mysql_stmt_close() function.
The MYSQL_STMT structure should be considered as opaque; copying or changing values of its members might produce unexpected results, errors or program crashes.
The MYSQL_FIELD structure describes the metadata of a column. It can be obtained by the mysql_fetch_field() function.
It has the following members:
The length of column name
The original name of the column
The length of original column name
The original name of the table
The length of original table name
The name of the database (schema)
The length of database name
The catalog name (always 'def')
The length of catalog name
The length of default value
The length (width) of the column definition
The maximum length of the column value
The MYSQL_BIND structure is used to provide parameters for prepared statements or to receive output column value from prepared statements.
Pointer for the length of the buffer (not used for parameters)
Pointer which indicates if column is NULL (not used for parameters)
Pointer which indicates if an error occured
Data buffer which contains or receives data
Array of indicator variables for bulk operation parameter
Used if length pointer is NULL
Used if error pointer is NULL
Used if is_null pointer is NULL
Set if integer type is unsigned
The MYSQL_TIME structure is used for date and time values in prepared statements. It has the following members:
Fractional seconds (max. 6 digits)
enum enum_mysql_timestamp_type
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