When the PREPARE statement is executed, the specified statement is parsed, analyzed, and rewritten. When an EXECUTE command is subsequently issued, the prepared statement is planned and executed. This division of labor avoids repetitive parse analysis work, while allowing the execution plan to depend on the specific. It must be unique within a single session and is subsequently used to execute or deallocate a previously prepared statement. data_type The data type of a parameter to the prepared statement. Prepared statements can take parameters: values that are substituted into the statement when it is executed. When creating the prepared statement, refer to parameters by position, using 1, 2, etc. A corresponding list of parameter data types can optionally be specified. Refer to EXECUTE for more information about that. Prepared statements only last for the duration of the current database session. When the session ends, the prepared statement is forgotten, so it must be recreated before being used again.
Calling PDO:prepare and for statements that will be issued multiple times with different parameter values optimizes the performance of your application by allowing the driver to negotiate client and/or server side caching of the query plan and meta information, and helps to prevent SQL injection attacks by.
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Example #2 Prepare an SQL statement with question mark parameters?php / Execute a prepared statement by passing an array of values / sth dbh- prepare SELECT name, colour, calories FROM fruit WHERE calories ? AND colour? sth- execute(array(150, 'red red sth- fetchAll sth- execute(array(175, 'yellow yellow sth- fetchAll? See Also - Execute an SQL statement and return the number of affected rows - Executes an SQL statement.