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Merged
merged 6 commits into from
Oct 10, 2025
Merged

Add support for CHECK constraints #257

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b2377fa
Add support for CHECK constraints
JanJakes Oct 2, 2025
ea0826c
Implement DROP CONSTRAINT for CHECK constraints
JanJakes Oct 10, 2025
9cc84c0
Implement DROP CHECK statement
JanJakes Oct 10, 2025
b5ba184
Add information schema data tests for CHECK constraints
JanJakes Oct 10, 2025
638bab9
Improve tests
JanJakes Oct 10, 2025
09a2385
Add a test for CHECK constraint with NOT ENFORCED
JanJakes Oct 10, 2025
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217 changes: 217 additions & 0 deletions tests/WP_SQLite_Driver_Metadata_Tests.php
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Original file line number Diff line number Diff line change
Expand Up @@ -1878,4 +1878,221 @@ public function testInformationSchemaAlterTableDropConstraintWithAmbiguousName()
$this->expectExceptionCode( 'HY000' );
$this->assertQuery( 'ALTER TABLE t2 DROP CONSTRAINT cnst' );
}

public function testInformationSchemaCheckConstraints(): void {
$this->assertQuery(
"CREATE TABLE t (
id INT NOT NULL CHECK (id > 0),
name VARCHAR(255) NOT NULL CHECK (name != ''),
score DOUBLE NOT NULL CHECK (score > 0 AND score < 100),
data JSON CHECK (json_valid(data)),
start_timestamp TIMESTAMP NOT NULL,
end_timestamp TIMESTAMP NOT NULL,
CONSTRAINT c1 CHECK (id < 10),
CONSTRAINT c2 CHECK (start_timestamp < end_timestamp),
CONSTRAINT c3 CHECK (length(data) < 20)
)"
);

// INFORMATION_SCHEMA.TABLE_CONSTRAINTS
$result = $this->assertQuery( "SELECT * FROM information_schema.table_constraints WHERE table_name = 't' ORDER BY CONSTRAINT_NAME" );
$this->assertEquals(
array(
(object) array(
'CONSTRAINT_CATALOG' => 'def',
'CONSTRAINT_SCHEMA' => 'wp',
'CONSTRAINT_NAME' => 'c1',
'TABLE_SCHEMA' => 'wp',
'TABLE_NAME' => 't',
'CONSTRAINT_TYPE' => 'CHECK',
'ENFORCED' => 'YES',
),
(object) array(
'CONSTRAINT_CATALOG' => 'def',
'CONSTRAINT_SCHEMA' => 'wp',
'CONSTRAINT_NAME' => 'c2',
'TABLE_SCHEMA' => 'wp',
'TABLE_NAME' => 't',
'CONSTRAINT_TYPE' => 'CHECK',
'ENFORCED' => 'YES',
),
(object) array(
'CONSTRAINT_CATALOG' => 'def',
'CONSTRAINT_SCHEMA' => 'wp',
'CONSTRAINT_NAME' => 'c3',
'TABLE_SCHEMA' => 'wp',
'TABLE_NAME' => 't',
'CONSTRAINT_TYPE' => 'CHECK',
'ENFORCED' => 'YES',
),
(object) array(
'CONSTRAINT_CATALOG' => 'def',
'CONSTRAINT_SCHEMA' => 'wp',
'CONSTRAINT_NAME' => 't_chk_1',
'TABLE_SCHEMA' => 'wp',
'TABLE_NAME' => 't',
'CONSTRAINT_TYPE' => 'CHECK',
'ENFORCED' => 'YES',
),
(object) array(
'CONSTRAINT_CATALOG' => 'def',
'CONSTRAINT_SCHEMA' => 'wp',
'CONSTRAINT_NAME' => 't_chk_2',
'TABLE_SCHEMA' => 'wp',
'TABLE_NAME' => 't',
'CONSTRAINT_TYPE' => 'CHECK',
'ENFORCED' => 'YES',
),
(object) array(
'CONSTRAINT_CATALOG' => 'def',
'CONSTRAINT_SCHEMA' => 'wp',
'CONSTRAINT_NAME' => 't_chk_3',
'TABLE_SCHEMA' => 'wp',
'TABLE_NAME' => 't',
'CONSTRAINT_TYPE' => 'CHECK',
'ENFORCED' => 'YES',
),
(object) array(
'CONSTRAINT_CATALOG' => 'def',
'CONSTRAINT_SCHEMA' => 'wp',
'CONSTRAINT_NAME' => 't_chk_4',
'TABLE_SCHEMA' => 'wp',
'TABLE_NAME' => 't',
'CONSTRAINT_TYPE' => 'CHECK',
'ENFORCED' => 'YES',
),
),
$result
);

// INFORMATION_SCHEMA.CHECK_CONSTRAINTS
$result = $this->assertQuery( 'SELECT * FROM information_schema.check_constraints ORDER BY CONSTRAINT_NAME' );
$this->assertCount( 7, $result );

$this->assertEquals(
array(
(object) array(
'CONSTRAINT_CATALOG' => 'def',
'CONSTRAINT_SCHEMA' => 'wp',
'CONSTRAINT_NAME' => 'c1',
'CHECK_CLAUSE' => '( id < 10 )',
),
(object) array(
'CONSTRAINT_CATALOG' => 'def',
'CONSTRAINT_SCHEMA' => 'wp',
'CONSTRAINT_NAME' => 'c2',
'CHECK_CLAUSE' => '( start_timestamp < end_timestamp )',
),
(object) array(
'CONSTRAINT_CATALOG' => 'def',
'CONSTRAINT_SCHEMA' => 'wp',
'CONSTRAINT_NAME' => 'c3',
'CHECK_CLAUSE' => '( length ( data ) < 20 )',
),
(object) array(
'CONSTRAINT_CATALOG' => 'def',
'CONSTRAINT_SCHEMA' => 'wp',
'CONSTRAINT_NAME' => 't_chk_1',
'CHECK_CLAUSE' => '( id > 0 )',
),
(object) array(
'CONSTRAINT_CATALOG' => 'def',
'CONSTRAINT_SCHEMA' => 'wp',
'CONSTRAINT_NAME' => 't_chk_2',
'CHECK_CLAUSE' => "( name != '' )",
),
(object) array(
'CONSTRAINT_CATALOG' => 'def',
'CONSTRAINT_SCHEMA' => 'wp',
'CONSTRAINT_NAME' => 't_chk_3',
'CHECK_CLAUSE' => '( score > 0 AND score < 100 )',
),
(object) array(
'CONSTRAINT_CATALOG' => 'def',
'CONSTRAINT_SCHEMA' => 'wp',
'CONSTRAINT_NAME' => 't_chk_4',
'CHECK_CLAUSE' => '( json_valid ( data ) )',
),
),
$result
);
}

public function testInformationSchemaAlterTableAddCheckConstraint(): void {
$this->assertQuery( 'CREATE TABLE t (id INT)' );

// ADD CONSTRAINT syntax.
$this->assertQuery( 'ALTER TABLE t ADD CONSTRAINT c CHECK (id > 0)' );

// ADD CHECK syntax.
$this->assertQuery( 'ALTER TABLE t ADD CHECK (id < 10)' );

// INFORMATION_SCHEMA.TABLE_CONSTRAINTS
$result = $this->assertQuery( "SELECT * FROM information_schema.table_constraints WHERE table_name = 't' ORDER BY CONSTRAINT_NAME" );
$this->assertEquals(
array(
(object) array(
'CONSTRAINT_CATALOG' => 'def',
'CONSTRAINT_SCHEMA' => 'wp',
'CONSTRAINT_NAME' => 'c',
'TABLE_SCHEMA' => 'wp',
'TABLE_NAME' => 't',
'CONSTRAINT_TYPE' => 'CHECK',
'ENFORCED' => 'YES',
),
(object) array(
'CONSTRAINT_CATALOG' => 'def',
'CONSTRAINT_SCHEMA' => 'wp',
'CONSTRAINT_NAME' => 't_chk_1',
'TABLE_SCHEMA' => 'wp',
'TABLE_NAME' => 't',
'CONSTRAINT_TYPE' => 'CHECK',
'ENFORCED' => 'YES',
),
),
$result
);

// INFORMATION_SCHEMA.CHECK_CONSTRAINTS
$result = $this->assertQuery( 'SELECT * FROM information_schema.check_constraints ORDER BY CONSTRAINT_NAME' );
$this->assertEquals(
array(
(object) array(
'CONSTRAINT_CATALOG' => 'def',
'CONSTRAINT_SCHEMA' => 'wp',
'CONSTRAINT_NAME' => 'c',
'CHECK_CLAUSE' => '( id > 0 )',
),
(object) array(
'CONSTRAINT_CATALOG' => 'def',
'CONSTRAINT_SCHEMA' => 'wp',
'CONSTRAINT_NAME' => 't_chk_1',
'CHECK_CLAUSE' => '( id < 10 )',
),
),
$result
);
}

public function testInformationSchemaAlterTableDropCheckConstraint(): void {
$this->assertQuery( 'CREATE TABLE t (id INT, CONSTRAINT c1 CHECK (id > 0), CONSTRAINT c2 CHECK (id < 10))' );

$result = $this->assertQuery( "SELECT * FROM information_schema.table_constraints WHERE table_name = 't'" );
$this->assertCount( 2, $result );

$result = $this->assertQuery( 'SELECT * FROM information_schema.check_constraints' );
$this->assertCount( 2, $result );

// DROP CONSTRAINT syntax.
$this->assertQuery( 'ALTER TABLE t DROP CONSTRAINT c1' );

// DROP CHECK syntax.
$this->assertQuery( 'ALTER TABLE t DROP CHECK c2' );

$result = $this->assertQuery( "SELECT * FROM information_schema.table_constraints WHERE table_name = 't'" );
$this->assertCount( 0, $result );

$result = $this->assertQuery( 'SELECT * FROM information_schema.check_constraints' );
$this->assertCount( 0, $result );
}
}
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