MySQL PREPARE Statement Guide

In MySQL, the PREPARE statement is used to create a prepared statement. By using a prepared statement, SQL statements and parameters are separated, enhancing the security and performance of SQL statements.

The basic syntax of the PREPARE statement is as follows:

PREPARE statement_name FROM 'sql_statement';

Among them, statement_name is the name of the prepared statement, and sql_statement is the SQL statement to be prepared.

After the preprocessing statement is created, it can be executed using the EXECUTE statement.

EXECUTE statement_name;

After executing the preprocessing statements, you can use the DEALLOCATE statement to release the resources occupied by the preprocessing statements.

DEALLOCATE PREPARE statement_name;

In a pre-processing statement, you can use parameters to replace specific values. Parameters use “?” as a placeholder, and when executing the pre-processing statement, specific parameter values are passed in. For example:

PREPARE stmt FROM 'SELECT * FROM customers WHERE id = ?';
EXECUTE stmt USING @customer_id;

In the above example, stmt is the name of the prepared statement and @customer_id is the value of the parameter.

By using prepared statements, SQL injection attacks can be avoided, increasing the security of SQL statements. Additionally, prepared statements can also cache compiled execution plans, improving the performance of SQL statements.