prepare.sql

来自「postgresql8.3.4源码,开源数据库」· SQL 代码 · 共 79 行

-- Regression tests for prepareable statements. We query the content
-- of the pg_prepared_statements view as prepared statements are
-- created and removed.

SELECT name, statement, parameter_types FROM pg_prepared_statements;

PREPARE q1 AS SELECT 1 AS a;
EXECUTE q1;

SELECT name, statement, parameter_types FROM pg_prepared_statements;

-- should fail
PREPARE q1 AS SELECT 2;

-- should succeed
DEALLOCATE q1;
PREPARE q1 AS SELECT 2;
EXECUTE q1;

PREPARE q2 AS SELECT 2 AS b;
SELECT name, statement, parameter_types FROM pg_prepared_statements;

-- sql92 syntax
DEALLOCATE PREPARE q1;

SELECT name, statement, parameter_types FROM pg_prepared_statements;

DEALLOCATE PREPARE q2;
-- the view should return the empty set again
SELECT name, statement, parameter_types FROM pg_prepared_statements;

-- parameterized queries
PREPARE q2(text) AS
	SELECT datname, datistemplate, datallowconn
	FROM pg_database WHERE datname = $1;

EXECUTE q2('regression');

PREPARE q3(text, int, float, boolean, oid, smallint) AS
	SELECT * FROM tenk1 WHERE string4 = $1 AND (four = $2 OR
	ten = $3::bigint OR true = $4 OR oid = $5 OR odd = $6::int)
	ORDER BY unique1;

EXECUTE q3('AAAAxx', 5::smallint, 10.5::float, false, 500::oid, 4::bigint);

-- too few params
EXECUTE q3('bool');

-- too many params
EXECUTE q3('bytea', 5::smallint, 10.5::float, false, 500::oid, 4::bigint, true);

-- wrong param types
EXECUTE q3(5::smallint, 10.5::float, false, 500::oid, 4::bigint, 'bytea');

-- invalid type
PREPARE q4(nonexistenttype) AS SELECT $1;

-- create table as execute
PREPARE q5(int, text) AS
	SELECT * FROM tenk1 WHERE unique1 = $1 OR stringu1 = $2
	ORDER BY unique1;
CREATE TEMPORARY TABLE q5_prep_results AS EXECUTE q5(200, 'DTAAAA');
SELECT * FROM q5_prep_results;

-- unknown or unspecified parameter types: should succeed
PREPARE q6 AS
    SELECT * FROM tenk1 WHERE unique1 = $1 AND stringu1 = $2;
PREPARE q7(unknown) AS
    SELECT * FROM road WHERE thepath = $1;

SELECT name, statement, parameter_types FROM pg_prepared_statements
    ORDER BY name;

-- test DEALLOCATE ALL;
DEALLOCATE ALL;
SELECT name, statement, parameter_types FROM pg_prepared_statements
    ORDER BY name;