PREPARE
Function
PREPARE creates a prepared statement.
A prepared statement is a performance optimizing object on the server. When the PREPARE statement is executed, the specified query is parsed, analyzed, and rewritten. When EXECUTE is executed, the prepared statement is planned and executed. This avoids repetitive parsing and analysis. After the **PREPARE **statement is created, it exists throughout the database session. Once it is created (even if in a transaction block), it will not be deleted when a transaction is rolled back. It can only be deleted by explicitly invoking DEALLOCATE or automatically deleted when the session ends.
Precautions
None
Syntax
PREPARE name [ ( data_type [, ...] ) ] AS statement;
Parameter Description
name
Specifies the name of a prepared statement. It must be unique in the session.
data_type
Specifies the type of an argument.
statement
Specifies a SELECT, INSERT, UPDATE, DELETE, MERGE INTO, or VALUES statement.
Examples
See Examples in EXECUTE.