EXECUTE
Synopsis
Use the EXECUTE statement to execute a previously prepared statement. This separation is a performance optimization because a prepared statement would be executed many times with different values while the syntax and semantics analysis and rewriting are done only once during PREPARE processing.
Syntax
execute_statement ::= EXECUTE name [ ( expression [ , ... ] ) ]
execute_statement
Semantics
name
Specify the name of the prepared statement to execute.
expression
Specify the expression. Each expression in EXECUTE must match with the corresponding data type from PREPARE.
Examples
- Create a sample table.
yugabyte=# CREATE TABLE sample(k1 int, k2 int, v1 int, v2 text, PRIMARY KEY (k1, k2));
- Prepare a simple insert.
yugabyte=# PREPARE ins (bigint, double precision, int, text) AS
INSERT INTO sample(k1, k2, v1, v2) VALUES ($1, $2, $3, $4);
- Execute the insert twice (with different parameters).
yugabyte=# EXECUTE ins(1, 2.0, 3, 'a');
yugabyte=# EXECUTE ins(2, 3.0, 4, 'b');
- Check the results.
yugabyte=# SELECT * FROM sample ORDER BY k1;
k1 | k2 | v1 | v2
----+----+----+----
1 | 2 | 3 | a
2 | 3 | 4 | b
(2 rows)