Merge pull request #21906 from owncloud/querybuilder-clob-comparison

Querybuilder clob comparison

lib/private/db/connection.php

@@ -29,8 +29,8 @@ use Doctrine\DBAL\Driver;
 use Doctrine\DBAL\Configuration;
 use Doctrine\DBAL\Cache\QueryCacheProfile;
 use Doctrine\Common\EventManager;
-use OC\DB\QueryBuilder\ExpressionBuilder;
 use OC\DB\QueryBuilder\QueryBuilder;
+use OCP\DB\QueryBuilder\IQueryBuilder;
 use OCP\IDBConnection;
 use OCP\PreconditionNotMetException;
 
@@ -244,11 +244,11 @@ class Connection extends \Doctrine\DBAL\Connection implements IDBConnection {
 
 	private function getType($value) {
 		if (is_bool($value)) {
-			return \PDO::PARAM_BOOL;
+			return IQueryBuilder::PARAM_BOOL;
 		} else if (is_int($value)) {
-			return \PDO::PARAM_INT;
+			return IQueryBuilder::PARAM_INT;
 		} else {
-			return \PDO::PARAM_STR;
+			return IQueryBuilder::PARAM_STR;
 		}
 	}
 
@@ -278,7 +278,7 @@ class Connection extends \Doctrine\DBAL\Connection implements IDBConnection {
 			$updateQb = $this->getQueryBuilder();
 			$updateQb->update($table);
 			foreach ($values as $name => $value) {
-				$updateQb->set($name, $updateQb->createNamedParameter($value), $this->getType($value));
+				$updateQb->set($name, $updateQb->createNamedParameter($value, $this->getType($value)));
 			}
 			$where = $updateQb->expr()->andx();
 			$whereValues = array_merge($keys, $updatePreconditionValues);

lib/private/db/querybuilder/expressionbuilder.php

@@ -86,12 +86,14 @@ class ExpressionBuilder implements IExpressionBuilder {
 	 * Creates a comparison expression.
 	 *
 	 * @param mixed $x The left expression.
-	 * @param string $operator One of the ExpressionBuilder::* constants.
+	 * @param string $operator One of the IExpressionBuilder::* constants.
 	 * @param mixed $y The right expression.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
 	 */
-	public function comparison($x, $operator, $y) {
+	public function comparison($x, $operator, $y, $type = null) {
 		$x = $this->helper->quoteColumnName($x);
 		$y = $this->helper->quoteColumnName($y);
 		return $this->expressionBuilder->comparison($x, $operator, $y);
@@ -109,7 +111,7 @@ class ExpressionBuilder implements IExpressionBuilder {
 	 *
 	 * @param mixed $x The left expression.
 	 * @param mixed $y The right expression.
-	 * @param int|null $type one of the \PDO::PARAM_* constants
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
 	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
@@ -131,10 +133,12 @@ class ExpressionBuilder implements IExpressionBuilder {
 	 *
 	 * @param mixed $x The left expression.
 	 * @param mixed $y The right expression.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
 	 */
-	public function neq($x, $y) {
+	public function neq($x, $y, $type = null) {
 		$x = $this->helper->quoteColumnName($x);
 		$y = $this->helper->quoteColumnName($y);
 		return $this->expressionBuilder->neq($x, $y);
@@ -151,10 +155,12 @@ class ExpressionBuilder implements IExpressionBuilder {
 	 *
 	 * @param mixed $x The left expression.
 	 * @param mixed $y The right expression.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
 	 */
-	public function lt($x, $y) {
+	public function lt($x, $y, $type = null) {
 		$x = $this->helper->quoteColumnName($x);
 		$y = $this->helper->quoteColumnName($y);
 		return $this->expressionBuilder->lt($x, $y);
@@ -171,10 +177,12 @@ class ExpressionBuilder implements IExpressionBuilder {
 	 *
 	 * @param mixed $x The left expression.
 	 * @param mixed $y The right expression.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
 	 */
-	public function lte($x, $y) {
+	public function lte($x, $y, $type = null) {
 		$x = $this->helper->quoteColumnName($x);
 		$y = $this->helper->quoteColumnName($y);
 		return $this->expressionBuilder->lte($x, $y);
@@ -191,10 +199,12 @@ class ExpressionBuilder implements IExpressionBuilder {
 	 *
 	 * @param mixed $x The left expression.
 	 * @param mixed $y The right expression.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
 	 */
-	public function gt($x, $y) {
+	public function gt($x, $y, $type = null) {
 		$x = $this->helper->quoteColumnName($x);
 		$y = $this->helper->quoteColumnName($y);
 		return $this->expressionBuilder->gt($x, $y);
@@ -211,10 +221,12 @@ class ExpressionBuilder implements IExpressionBuilder {
 	 *
 	 * @param mixed $x The left expression.
 	 * @param mixed $y The right expression.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
 	 */
-	public function gte($x, $y) {
+	public function gte($x, $y, $type = null) {
 		$x = $this->helper->quoteColumnName($x);
 		$y = $this->helper->quoteColumnName($y);
 		return $this->expressionBuilder->gte($x, $y);
@@ -249,10 +261,12 @@ class ExpressionBuilder implements IExpressionBuilder {
 	 *
 	 * @param string $x Field in string format to be inspected by LIKE() comparison.
 	 * @param mixed $y Argument to be used in LIKE() comparison.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
 	 */
-	public function like($x, $y) {
+	public function like($x, $y, $type = null) {
 		$x = $this->helper->quoteColumnName($x);
 		$y = $this->helper->quoteColumnName($y);
 		return $this->expressionBuilder->like($x, $y);
@@ -263,10 +277,12 @@ class ExpressionBuilder implements IExpressionBuilder {
 	 *
 	 * @param string $x Field in string format to be inspected by NOT LIKE() comparison.
 	 * @param mixed $y Argument to be used in NOT LIKE() comparison.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
 	 */
-	public function notLike($x, $y) {
+	public function notLike($x, $y, $type = null) {
 		$x = $this->helper->quoteColumnName($x);
 		$y = $this->helper->quoteColumnName($y);
 		return $this->expressionBuilder->notLike($x, $y);
@@ -277,10 +293,12 @@ class ExpressionBuilder implements IExpressionBuilder {
 	 *
 	 * @param string $x The field in string format to be inspected by IN() comparison.
 	 * @param string|array $y The placeholder or the array of values to be used by IN() comparison.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
 	 */
-	public function in($x, $y) {
+	public function in($x, $y, $type = null) {
 		$x = $this->helper->quoteColumnName($x);
 		$y = $this->helper->quoteColumnNames($y);
 		return $this->expressionBuilder->in($x, $y);
@@ -291,10 +309,12 @@ class ExpressionBuilder implements IExpressionBuilder {
 	 *
 	 * @param string $x The field in string format to be inspected by NOT IN() comparison.
 	 * @param string|array $y The placeholder or the array of values to be used by NOT IN() comparison.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
 	 */
-	public function notIn($x, $y) {
+	public function notIn($x, $y, $type = null) {
 		$x = $this->helper->quoteColumnName($x);
 		$y = $this->helper->quoteColumnNames($y);
 		return $this->expressionBuilder->notIn($x, $y);
@@ -304,7 +324,7 @@ class ExpressionBuilder implements IExpressionBuilder {
 	 * Quotes a given input parameter.
 	 *
 	 * @param mixed $input The parameter to be quoted.
-	 * @param string|null $type The type of the parameter.
+	 * @param mixed|null $type One of the IQueryBuilder::PARAM_* constants
 	 *
 	 * @return Literal
 	 */

lib/private/db/querybuilder/ociexpressionbuilder.php

@@ -21,13 +21,115 @@
 
 namespace OC\DB\QueryBuilder;
 
+
+use OCP\DB\QueryBuilder\ILiteral;
+use OCP\DB\QueryBuilder\IParameter;
+use OCP\DB\QueryBuilder\IQueryBuilder;
+
 class OCIExpressionBuilder extends ExpressionBuilder {
-	public function eq($x, $y, $type = null) {
+
-		$x = $this->helper->quoteColumnName($x);
+	/**
-		$y = $this->helper->quoteColumnName($y);
+	 * @param mixed $column
-		if ($type === \PDO::PARAM_STR) {
+	 * @param mixed|null $type
-			$x = new QueryFunction('to_char(' . $x . ')');
+	 * @return array|QueryFunction|string
+	 */
+	protected function prepareColumn($column, $type) {
+		if ($type === IQueryBuilder::PARAM_STR && !is_array($column) && !($column instanceof IParameter) && !($column instanceof ILiteral)) {
+			$column = $this->helper->quoteColumnName($column);
+			$column = new QueryFunction('to_char(' . $column . ')');
+		} else {
+			$column = $this->helper->quoteColumnNames($column);
 		}
+		return $column;
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function comparison($x, $operator, $y, $type = null) {
+		$x = $this->prepareColumn($x, $type);
+		$y = $this->prepareColumn($y, $type);
+
+		return $this->expressionBuilder->comparison($x, $operator, $y);
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function eq($x, $y, $type = null) {
+		$x = $this->prepareColumn($x, $type);
+		$y = $this->prepareColumn($y, $type);
+
 		return $this->expressionBuilder->eq($x, $y);
 	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function neq($x, $y, $type = null) {
+		$x = $this->prepareColumn($x, $type);
+		$y = $this->prepareColumn($y, $type);
+
+		return $this->expressionBuilder->neq($x, $y);
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function lt($x, $y, $type = null) {
+		$x = $this->prepareColumn($x, $type);
+		$y = $this->prepareColumn($y, $type);
+
+		return $this->expressionBuilder->lt($x, $y);
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function lte($x, $y, $type = null) {
+		$x = $this->prepareColumn($x, $type);
+		$y = $this->prepareColumn($y, $type);
+
+		return $this->expressionBuilder->lte($x, $y);
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function gt($x, $y, $type = null) {
+		$x = $this->prepareColumn($x, $type);
+		$y = $this->prepareColumn($y, $type);
+
+		return $this->expressionBuilder->gt($x, $y);
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function gte($x, $y, $type = null) {
+		$x = $this->prepareColumn($x, $type);
+		$y = $this->prepareColumn($y, $type);
+
+		return $this->expressionBuilder->gte($x, $y);
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function in($x, $y, $type = null) {
+		$x = $this->prepareColumn($x, $type);
+		$y = $this->prepareColumn($y, $type);
+
+		return $this->expressionBuilder->in($x, $y);
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function notIn($x, $y, $type = null) {
+		$x = $this->prepareColumn($x, $type);
+		$y = $this->prepareColumn($y, $type);
+
+		return $this->expressionBuilder->notIn($x, $y);
+	}
 }

lib/public/db/querybuilder/iexpressionbuilder.php

@@ -21,11 +21,39 @@
 
 namespace OCP\DB\QueryBuilder;
 
+
+use Doctrine\DBAL\Query\Expression\ExpressionBuilder;
+
 /**
  * This class provides a wrapper around Doctrine's ExpressionBuilder
  * @since 8.2.0
  */
 interface IExpressionBuilder {
+	/**
+	 * @since 9.0.0
+	 */
+	const EQ  = ExpressionBuilder::EQ;
+	/**
+	 * @since 9.0.0
+	 */
+	const NEQ = ExpressionBuilder::NEQ;
+	/**
+	 * @since 9.0.0
+	 */
+	const LT  = ExpressionBuilder::LT;
+	/**
+	 * @since 9.0.0
+	 */
+	const LTE = ExpressionBuilder::LTE;
+	/**
+	 * @since 9.0.0
+	 */
+	const GT  = ExpressionBuilder::GT;
+	/**
+	 * @since 9.0.0
+	 */
+	const GTE = ExpressionBuilder::GTE;
+
 	/**
 	 * Creates a conjunction of the given boolean expressions.
 	 *
@@ -64,13 +92,15 @@ interface IExpressionBuilder {
 	 * Creates a comparison expression.
 	 *
 	 * @param mixed $x The left expression.
-	 * @param string $operator One of the ExpressionBuilder::* constants.
+	 * @param string $operator One of the IExpressionBuilder::* constants.
 	 * @param mixed $y The right expression.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
-	 * @since 8.2.0
+	 * @since 8.2.0 - Parameter $type was added in 9.0.0
 	 */
-	public function comparison($x, $operator, $y);
+	public function comparison($x, $operator, $y, $type = null);
 
 	/**
 	 * Creates an equality comparison expression with the given arguments.
@@ -84,11 +114,11 @@ interface IExpressionBuilder {
 	 *
 	 * @param mixed $x The left expression.
 	 * @param mixed $y The right expression.
-	 * @param int|null $type @since 9.0.0 one of the \PDO::PARAM_* constants
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
-	 *                  required when comparing text fields for oci compatibility.
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
-	 * @since 8.2.0
+	 * @since 8.2.0 - Parameter $type was added in 9.0.0
 	 */
 	public function eq($x, $y, $type = null);
 
@@ -103,11 +133,13 @@ interface IExpressionBuilder {
 	 *
 	 * @param mixed $x The left expression.
 	 * @param mixed $y The right expression.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
-	 * @since 8.2.0
+	 * @since 8.2.0 - Parameter $type was added in 9.0.0
 	 */
-	public function neq($x, $y);
+	public function neq($x, $y, $type = null);
 
 	/**
 	 * Creates a lower-than comparison expression with the given arguments.
@@ -120,11 +152,13 @@ interface IExpressionBuilder {
 	 *
 	 * @param mixed $x The left expression.
 	 * @param mixed $y The right expression.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
-	 * @since 8.2.0
+	 * @since 8.2.0 - Parameter $type was added in 9.0.0
 	 */
-	public function lt($x, $y);
+	public function lt($x, $y, $type = null);
 
 	/**
 	 * Creates a lower-than-equal comparison expression with the given arguments.
@@ -137,11 +171,13 @@ interface IExpressionBuilder {
 	 *
 	 * @param mixed $x The left expression.
 	 * @param mixed $y The right expression.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
-	 * @since 8.2.0
+	 * @since 8.2.0 - Parameter $type was added in 9.0.0
 	 */
-	public function lte($x, $y);
+	public function lte($x, $y, $type = null);
 
 	/**
 	 * Creates a greater-than comparison expression with the given arguments.
@@ -154,11 +190,13 @@ interface IExpressionBuilder {
 	 *
 	 * @param mixed $x The left expression.
 	 * @param mixed $y The right expression.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
-	 * @since 8.2.0
+	 * @since 8.2.0 - Parameter $type was added in 9.0.0
 	 */
-	public function gt($x, $y);
+	public function gt($x, $y, $type = null);
 
 	/**
 	 * Creates a greater-than-equal comparison expression with the given arguments.
@@ -171,11 +209,13 @@ interface IExpressionBuilder {
 	 *
 	 * @param mixed $x The left expression.
 	 * @param mixed $y The right expression.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
-	 * @since 8.2.0
+	 * @since 8.2.0 - Parameter $type was added in 9.0.0
 	 */
-	public function gte($x, $y);
+	public function gte($x, $y, $type = null);
 
 	/**
 	 * Creates an IS NULL expression with the given arguments.
@@ -202,50 +242,58 @@ interface IExpressionBuilder {
 	 *
 	 * @param string $x Field in string format to be inspected by LIKE() comparison.
 	 * @param mixed $y Argument to be used in LIKE() comparison.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
-	 * @since 8.2.0
+	 * @since 8.2.0 - Parameter $type was added in 9.0.0
 	 */
-	public function like($x, $y);
+	public function like($x, $y, $type = null);
 
 	/**
 	 * Creates a NOT LIKE() comparison expression with the given arguments.
 	 *
 	 * @param string $x Field in string format to be inspected by NOT LIKE() comparison.
 	 * @param mixed $y Argument to be used in NOT LIKE() comparison.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
-	 * @since 8.2.0
+	 * @since 8.2.0 - Parameter $type was added in 9.0.0
 	 */
-	public function notLike($x, $y);
+	public function notLike($x, $y, $type = null);
 
 	/**
 	 * Creates a IN () comparison expression with the given arguments.
 	 *
 	 * @param string $x The field in string format to be inspected by IN() comparison.
 	 * @param string|array $y The placeholder or the array of values to be used by IN() comparison.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
-	 * @since 8.2.0
+	 * @since 8.2.0 - Parameter $type was added in 9.0.0
 	 */
-	public function in($x, $y);
+	public function in($x, $y, $type = null);
 
 	/**
 	 * Creates a NOT IN () comparison expression with the given arguments.
 	 *
 	 * @param string $x The field in string format to be inspected by NOT IN() comparison.
 	 * @param string|array $y The placeholder or the array of values to be used by NOT IN() comparison.
+	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
+	 *                  required when comparing text fields for oci compatibility
 	 *
 	 * @return string
-	 * @since 8.2.0
+	 * @since 8.2.0 - Parameter $type was added in 9.0.0
 	 */
-	public function notIn($x, $y);
+	public function notIn($x, $y, $type = null);
 
 	/**
 	 * Quotes a given input parameter.
 	 *
 	 * @param mixed $input The parameter to be quoted.
-	 * @param string|null $type The type of the parameter.
+	 * @param mixed|null $type One of the IQueryBuilder::PARAM_* constants
 	 *
 	 * @return string
 	 * @since 8.2.0

tests/lib/db/querybuilder/expressionbuildertest.php

@@ -23,6 +23,8 @@ namespace Test\DB\QueryBuilder;
 
 use Doctrine\DBAL\Query\Expression\ExpressionBuilder as DoctrineExpressionBuilder;
 use OC\DB\QueryBuilder\ExpressionBuilder;
+use OCP\DB\QueryBuilder\IQueryBuilder;
+use Test\TestCase;
 
 /**
  * Class ExpressionBuilderTest
@@ -31,21 +33,24 @@ use OC\DB\QueryBuilder\ExpressionBuilder;
  *
  * @package Test\DB\QueryBuilder
  */
-class ExpressionBuilderTest extends \Test\TestCase {
+class ExpressionBuilderTest extends TestCase {
 	/** @var ExpressionBuilder */
 	protected $expressionBuilder;
 
 	/** @var DoctrineExpressionBuilder */
 	protected $doctrineExpressionBuilder;
 
+	/** @var \Doctrine\DBAL\Connection|\OCP\IDBConnection */
+	protected $connection;
+
 	protected function setUp() {
 		parent::setUp();
 
-		$connection = \OC::$server->getDatabaseConnection();
+		$this->connection = \OC::$server->getDatabaseConnection();
 
-		$this->expressionBuilder = new ExpressionBuilder($connection);
+		$this->expressionBuilder = new ExpressionBuilder($this->connection);
 
-		$this->doctrineExpressionBuilder = new DoctrineExpressionBuilder($connection);
+		$this->doctrineExpressionBuilder = new DoctrineExpressionBuilder($this->connection);
 	}
 
 	public function dataComparison() {
@@ -342,4 +347,81 @@ class ExpressionBuilderTest extends \Test\TestCase {
 			$actual->__toString()
 		);
 	}
+
+	public function dataClobComparisons() {
+		return [
+			['eq', '5', IQueryBuilder::PARAM_STR, false, 3],
+			['eq', '5', IQueryBuilder::PARAM_STR, true, 1],
+			['neq', '5', IQueryBuilder::PARAM_STR, false, 6],
+			['neq', '5', IQueryBuilder::PARAM_STR, true, 4],
+			['lt', '5', IQueryBuilder::PARAM_STR, false, 3],
+			['lt', '5', IQueryBuilder::PARAM_STR, true, 1],
+			['lte', '5', IQueryBuilder::PARAM_STR, false, 6],
+			['lte', '5', IQueryBuilder::PARAM_STR, true, 4],
+			['gt', '5', IQueryBuilder::PARAM_STR, false, 3],
+			['gt', '5', IQueryBuilder::PARAM_STR, true, 1],
+			['gte', '5', IQueryBuilder::PARAM_STR, false, 6],
+			['gte', '5', IQueryBuilder::PARAM_STR, true, 4],
+			['like', '%5%', IQueryBuilder::PARAM_STR, false, 3],
+			['like', '%5%', IQueryBuilder::PARAM_STR, true, 1],
+			['notLike', '%5%', IQueryBuilder::PARAM_STR, false, 6],
+			['notLike', '%5%', IQueryBuilder::PARAM_STR, true, 4],
+			['in', ['5'], IQueryBuilder::PARAM_STR_ARRAY, false, 3],
+			['in', ['5'], IQueryBuilder::PARAM_STR_ARRAY, true, 1],
+			['notIn', ['5'], IQueryBuilder::PARAM_STR_ARRAY, false, 6],
+			['notIn', ['5'], IQueryBuilder::PARAM_STR_ARRAY, true, 4],
+		];
+	}
+
+	/**
+	 * @dataProvider dataClobComparisons
+	 * @param string $function
+	 * @param mixed $value
+	 * @param mixed $type
+	 * @param bool $compareKeyToValue
+	 * @param int $expected
+	 */
+	public function testClobComparisons($function, $value, $type, $compareKeyToValue, $expected) {
+		$appId = $this->getUniqueID('testing');
+		$this->createConfig($appId, 1, 4);
+		$this->createConfig($appId, 2, 5);
+		$this->createConfig($appId, 3, 6);
+		$this->createConfig($appId, 4, 4);
+		$this->createConfig($appId, 5, 5);
+		$this->createConfig($appId, 6, 6);
+		$this->createConfig($appId, 7, 4);
+		$this->createConfig($appId, 8, 5);
+		$this->createConfig($appId, 9, 6);
+
+		$query = $this->connection->getQueryBuilder();
+		$query->select($query->createFunction('COUNT(*) AS `count`'))
+			->from('appconfig')
+			->where($query->expr()->eq('appid', $query->createNamedParameter($appId)))
+			->andWhere(call_user_func([$query->expr(), $function], 'configvalue', $query->createNamedParameter($value, $type), IQueryBuilder::PARAM_STR));
+
+		if ($compareKeyToValue) {
+			$query->andWhere(call_user_func([$query->expr(), $function], 'configkey', 'configvalue', IQueryBuilder::PARAM_STR));
+		}
+
+		$result = $query->execute();
+
+		$this->assertEquals(['count' => $expected], $result->fetch());
+		$result->closeCursor();
+
+		$query = $this->connection->getQueryBuilder();
+		$query->delete('appconfig')
+			->where($query->expr()->eq('appid', $query->createNamedParameter($appId)))
+			->execute();
+	}
+
+	protected function createConfig($appId, $key, $value) {
+		$query = $this->connection->getQueryBuilder();
+		$query->insert('appconfig')
+			->values([
+				'appid' => $query->createNamedParameter($appId),
+				'configkey' => $query->createNamedParameter((string) $key),
+				'configvalue' => $query->createNamedParameter((string) $value),
+			])
+			->execute();
+	}
 }