framework/db/mssql/QueryBuilder.php
<?php
/**
* @link https://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license https://www.yiiframework.com/license/
*/
namespace yii\db\mssql;
use yii\base\InvalidArgumentException;
use yii\base\NotSupportedException;
use yii\db\Constraint;
use yii\db\Expression;
use yii\db\TableSchema;
/**
* QueryBuilder is the query builder for MS SQL Server databases (version 2008 and above).
*
* @author Timur Ruziev <resurtm@gmail.com>
* @since 2.0
*/
class QueryBuilder extends \yii\db\QueryBuilder
{
/**
* @var array mapping from abstract column types (keys) to physical column types (values).
*/
public $typeMap = [
Schema::TYPE_PK => 'int IDENTITY PRIMARY KEY',
Schema::TYPE_UPK => 'int IDENTITY PRIMARY KEY',
Schema::TYPE_BIGPK => 'bigint IDENTITY PRIMARY KEY',
Schema::TYPE_UBIGPK => 'bigint IDENTITY PRIMARY KEY',
Schema::TYPE_CHAR => 'nchar(1)',
Schema::TYPE_STRING => 'nvarchar(255)',
Schema::TYPE_TEXT => 'nvarchar(max)',
Schema::TYPE_TINYINT => 'tinyint',
Schema::TYPE_SMALLINT => 'smallint',
Schema::TYPE_INTEGER => 'int',
Schema::TYPE_BIGINT => 'bigint',
Schema::TYPE_FLOAT => 'float',
Schema::TYPE_DOUBLE => 'float',
Schema::TYPE_DECIMAL => 'decimal(18,0)',
Schema::TYPE_DATETIME => 'datetime',
Schema::TYPE_TIMESTAMP => 'datetime',
Schema::TYPE_TIME => 'time',
Schema::TYPE_DATE => 'date',
Schema::TYPE_BINARY => 'varbinary(max)',
Schema::TYPE_BOOLEAN => 'bit',
Schema::TYPE_MONEY => 'decimal(19,4)',
];
/**
* {@inheritdoc}
*/
protected function defaultExpressionBuilders()
{
return array_merge(parent::defaultExpressionBuilders(), [
'yii\db\conditions\InCondition' => 'yii\db\mssql\conditions\InConditionBuilder',
'yii\db\conditions\LikeCondition' => 'yii\db\mssql\conditions\LikeConditionBuilder',
]);
}
/**
* {@inheritdoc}
*/
public function buildOrderByAndLimit($sql, $orderBy, $limit, $offset)
{
if (!$this->hasOffset($offset) && !$this->hasLimit($limit)) {
$orderBy = $this->buildOrderBy($orderBy);
return $orderBy === '' ? $sql : $sql . $this->separator . $orderBy;
}
if (version_compare($this->db->getSchema()->getServerVersion(), '11', '<')) {
return $this->oldBuildOrderByAndLimit($sql, $orderBy, $limit, $offset);
}
return $this->newBuildOrderByAndLimit($sql, $orderBy, $limit, $offset);
}
/**
* Builds the ORDER BY/LIMIT/OFFSET clauses for SQL SERVER 2012 or newer.
* @param string $sql the existing SQL (without ORDER BY/LIMIT/OFFSET)
* @param array $orderBy the order by columns. See [[\yii\db\Query::orderBy]] for more details on how to specify this parameter.
* @param int $limit the limit number. See [[\yii\db\Query::limit]] for more details.
* @param int $offset the offset number. See [[\yii\db\Query::offset]] for more details.
* @return string the SQL completed with ORDER BY/LIMIT/OFFSET (if any)
*/
protected function newBuildOrderByAndLimit($sql, $orderBy, $limit, $offset)
{
$orderBy = $this->buildOrderBy($orderBy);
if ($orderBy === '') {
// ORDER BY clause is required when FETCH and OFFSET are in the SQL
$orderBy = 'ORDER BY (SELECT NULL)';
}
$sql .= $this->separator . $orderBy;
// http://technet.microsoft.com/en-us/library/gg699618.aspx
$offset = $this->hasOffset($offset) ? $offset : '0';
$sql .= $this->separator . "OFFSET $offset ROWS";
if ($this->hasLimit($limit)) {
$sql .= $this->separator . "FETCH NEXT $limit ROWS ONLY";
}
return $sql;
}
/**
* Builds the ORDER BY/LIMIT/OFFSET clauses for SQL SERVER 2005 to 2008.
* @param string $sql the existing SQL (without ORDER BY/LIMIT/OFFSET)
* @param array $orderBy the order by columns. See [[\yii\db\Query::orderBy]] for more details on how to specify this parameter.
* @param int|Expression $limit the limit number. See [[\yii\db\Query::limit]] for more details.
* @param int $offset the offset number. See [[\yii\db\Query::offset]] for more details.
* @return string the SQL completed with ORDER BY/LIMIT/OFFSET (if any)
*/
protected function oldBuildOrderByAndLimit($sql, $orderBy, $limit, $offset)
{
$orderBy = $this->buildOrderBy($orderBy);
if ($orderBy === '') {
// ROW_NUMBER() requires an ORDER BY clause
$orderBy = 'ORDER BY (SELECT NULL)';
}
$sql = preg_replace('/^([\s(])*SELECT(\s+DISTINCT)?(?!\s*TOP\s*\()/i', "\\1SELECT\\2 rowNum = ROW_NUMBER() over ($orderBy),", $sql);
if ($this->hasLimit($limit)) {
if ($limit instanceof Expression) {
$limit = '(' . (string)$limit . ')';
}
$sql = "SELECT TOP $limit * FROM ($sql) sub";
} else {
$sql = "SELECT * FROM ($sql) sub";
}
if ($this->hasOffset($offset)) {
$sql .= $this->separator . "WHERE rowNum > $offset";
}
return $sql;
}
/**
* Builds a SQL statement for renaming a DB table.
* @param string $oldName the table to be renamed. The name will be properly quoted by the method.
* @param string $newName the new table name. The name will be properly quoted by the method.
* @return string the SQL statement for renaming a DB table.
*/
public function renameTable($oldName, $newName)
{
return 'sp_rename ' . $this->db->quoteTableName($oldName) . ', ' . $this->db->quoteTableName($newName);
}
/**
* Builds a SQL statement for renaming a column.
* @param string $table the table whose column is to be renamed. The name will be properly quoted by the method.
* @param string $oldName the old name of the column. The name will be properly quoted by the method.
* @param string $newName the new name of the column. The name will be properly quoted by the method.
* @return string the SQL statement for renaming a DB column.
*/
public function renameColumn($table, $oldName, $newName)
{
$table = $this->db->quoteTableName($table);
$oldName = $this->db->quoteColumnName($oldName);
$newName = $this->db->quoteColumnName($newName);
return "sp_rename '{$table}.{$oldName}', {$newName}, 'COLUMN'";
}
/**
* Builds a SQL statement for changing the definition of a column.
* @param string $table the table whose column is to be changed. The table name will be properly quoted by the method.
* @param string $column the name of the column to be changed. The name will be properly quoted by the method.
* @param string $type the new column type. The [[getColumnType]] method will be invoked to convert abstract column type (if any)
* into the physical one. Anything that is not recognized as abstract type will be kept in the generated SQL.
* For example, 'string' will be turned into 'varchar(255)', while 'string not null' will become 'varchar(255) not null'.
* @return string the SQL statement for changing the definition of a column.
* @throws NotSupportedException if this is not supported by the underlying DBMS.
*/
public function alterColumn($table, $column, $type)
{
$sqlAfter = [$this->dropConstraintsForColumn($table, $column, 'D')];
$columnName = $this->db->quoteColumnName($column);
$tableName = $this->db->quoteTableName($table);
$constraintBase = preg_replace('/[^a-z0-9_]/i', '', $table . '_' . $column);
if ($type instanceof \yii\db\mssql\ColumnSchemaBuilder) {
$type->setAlterColumnFormat();
$defaultValue = $type->getDefaultValue();
if ($defaultValue !== null) {
$sqlAfter[] = $this->addDefaultValue(
"DF_{$constraintBase}",
$table,
$column,
$defaultValue instanceof Expression ? $defaultValue : new Expression($defaultValue)
);
}
$checkValue = $type->getCheckValue();
if ($checkValue !== null) {
$sqlAfter[] = "ALTER TABLE {$tableName} ADD CONSTRAINT " .
$this->db->quoteColumnName("CK_{$constraintBase}") .
' CHECK (' . ($defaultValue instanceof Expression ? $checkValue : new Expression($checkValue)) . ')';
}
if ($type->isUnique()) {
$sqlAfter[] = "ALTER TABLE {$tableName} ADD CONSTRAINT " . $this->db->quoteColumnName("UQ_{$constraintBase}") . " UNIQUE ({$columnName})";
}
}
return 'ALTER TABLE ' . $tableName . ' ALTER COLUMN '
. $columnName . ' '
. $this->getColumnType($type) . "\n"
. implode("\n", $sqlAfter);
}
/**
* {@inheritdoc}
*/
public function addDefaultValue($name, $table, $column, $value)
{
return 'ALTER TABLE ' . $this->db->quoteTableName($table) . ' ADD CONSTRAINT '
. $this->db->quoteColumnName($name) . ' DEFAULT ' . $this->db->quoteValue($value) . ' FOR '
. $this->db->quoteColumnName($column);
}
/**
* {@inheritdoc}
*/
public function dropDefaultValue($name, $table)
{
return 'ALTER TABLE ' . $this->db->quoteTableName($table)
. ' DROP CONSTRAINT ' . $this->db->quoteColumnName($name);
}
/**
* Creates a SQL statement for resetting the sequence value of a table's primary key.
* The sequence will be reset such that the primary key of the next new row inserted
* will have the specified value or 1.
* @param string $tableName the name of the table whose primary key sequence will be reset
* @param mixed $value the value for the primary key of the next new row inserted. If this is not set,
* the next new row's primary key will have a value 1.
* @return string the SQL statement for resetting sequence
* @throws InvalidArgumentException if the table does not exist or there is no sequence associated with the table.
*/
public function resetSequence($tableName, $value = null)
{
$table = $this->db->getTableSchema($tableName);
if ($table !== null && $table->sequenceName !== null) {
$tableName = $this->db->quoteTableName($tableName);
if ($value === null) {
$key = $this->db->quoteColumnName(reset($table->primaryKey));
$value = "(SELECT COALESCE(MAX({$key}),0) FROM {$tableName})+1";
} else {
$value = (int) $value;
}
return "DBCC CHECKIDENT ('{$tableName}', RESEED, {$value})";
} elseif ($table === null) {
throw new InvalidArgumentException("Table not found: $tableName");
}
throw new InvalidArgumentException("There is not sequence associated with table '$tableName'.");
}
/**
* Builds a SQL statement for enabling or disabling integrity check.
* @param bool $check whether to turn on or off the integrity check.
* @param string $schema the schema of the tables.
* @param string $table the table name.
* @return string the SQL statement for checking integrity
*/
public function checkIntegrity($check = true, $schema = '', $table = '')
{
$enable = $check ? 'CHECK' : 'NOCHECK';
$schema = $schema ?: $this->db->getSchema()->defaultSchema;
$tableNames = $this->db->getTableSchema($table) ? [$table] : $this->db->getSchema()->getTableNames($schema);
$viewNames = $this->db->getSchema()->getViewNames($schema);
$tableNames = array_diff($tableNames, $viewNames);
$command = '';
foreach ($tableNames as $tableName) {
$tableName = $this->db->quoteTableName("{$schema}.{$tableName}");
$command .= "ALTER TABLE $tableName $enable CONSTRAINT ALL; ";
}
return $command;
}
/**
* Builds a SQL command for adding or updating a comment to a table or a column. The command built will check if a comment
* already exists. If so, it will be updated, otherwise, it will be added.
*
* @param string $comment the text of the comment to be added. The comment will be properly quoted by the method.
* @param string $table the table to be commented or whose column is to be commented. The table name will be
* properly quoted by the method.
* @param string|null $column optional. The name of the column to be commented. If empty, the command will add the
* comment to the table instead. The column name will be properly quoted by the method.
* @return string the SQL statement for adding a comment.
* @throws InvalidArgumentException if the table does not exist.
* @since 2.0.24
*/
protected function buildAddCommentSql($comment, $table, $column = null)
{
$tableSchema = $this->db->schema->getTableSchema($table);
if ($tableSchema === null) {
throw new InvalidArgumentException("Table not found: $table");
}
$schemaName = $tableSchema->schemaName ? "N'" . $tableSchema->schemaName . "'" : 'SCHEMA_NAME()';
$tableName = 'N' . $this->db->quoteValue($tableSchema->name);
$columnName = $column ? 'N' . $this->db->quoteValue($column) : null;
$comment = 'N' . $this->db->quoteValue($comment);
$functionParams = "
@name = N'MS_description',
@value = $comment,
@level0type = N'SCHEMA', @level0name = $schemaName,
@level1type = N'TABLE', @level1name = $tableName"
. ($column ? ", @level2type = N'COLUMN', @level2name = $columnName" : '') . ';';
return "
IF NOT EXISTS (
SELECT 1
FROM fn_listextendedproperty (
N'MS_description',
'SCHEMA', $schemaName,
'TABLE', $tableName,
" . ($column ? "'COLUMN', $columnName " : ' DEFAULT, DEFAULT ') . "
)
)
EXEC sys.sp_addextendedproperty $functionParams
ELSE
EXEC sys.sp_updateextendedproperty $functionParams
";
}
/**
* {@inheritdoc}
* @since 2.0.8
*/
public function addCommentOnColumn($table, $column, $comment)
{
return $this->buildAddCommentSql($comment, $table, $column);
}
/**
* {@inheritdoc}
* @since 2.0.8
*/
public function addCommentOnTable($table, $comment)
{
return $this->buildAddCommentSql($comment, $table);
}
/**
* Builds a SQL command for removing a comment from a table or a column. The command built will check if a comment
* already exists before trying to perform the removal.
*
* @param string $table the table that will have the comment removed or whose column will have the comment removed.
* The table name will be properly quoted by the method.
* @param string|null $column optional. The name of the column whose comment will be removed. If empty, the command
* will remove the comment from the table instead. The column name will be properly quoted by the method.
* @return string the SQL statement for removing the comment.
* @throws InvalidArgumentException if the table does not exist.
* @since 2.0.24
*/
protected function buildRemoveCommentSql($table, $column = null)
{
$tableSchema = $this->db->schema->getTableSchema($table);
if ($tableSchema === null) {
throw new InvalidArgumentException("Table not found: $table");
}
$schemaName = $tableSchema->schemaName ? "N'" . $tableSchema->schemaName . "'" : 'SCHEMA_NAME()';
$tableName = 'N' . $this->db->quoteValue($tableSchema->name);
$columnName = $column ? 'N' . $this->db->quoteValue($column) : null;
return "
IF EXISTS (
SELECT 1
FROM fn_listextendedproperty (
N'MS_description',
'SCHEMA', $schemaName,
'TABLE', $tableName,
" . ($column ? "'COLUMN', $columnName " : ' DEFAULT, DEFAULT ') . "
)
)
EXEC sys.sp_dropextendedproperty
@name = N'MS_description',
@level0type = N'SCHEMA', @level0name = $schemaName,
@level1type = N'TABLE', @level1name = $tableName"
. ($column ? ", @level2type = N'COLUMN', @level2name = $columnName" : '') . ';';
}
/**
* {@inheritdoc}
* @since 2.0.8
*/
public function dropCommentFromColumn($table, $column)
{
return $this->buildRemoveCommentSql($table, $column);
}
/**
* {@inheritdoc}
* @since 2.0.8
*/
public function dropCommentFromTable($table)
{
return $this->buildRemoveCommentSql($table);
}
/**
* Returns an array of column names given model name.
*
* @param string|null $modelClass name of the model class
* @return array|null array of column names
*/
protected function getAllColumnNames($modelClass = null)
{
if (!$modelClass) {
return null;
}
/* @var $modelClass \yii\db\ActiveRecord */
$schema = $modelClass::getTableSchema();
return array_keys($schema->columns);
}
/**
* @return bool whether the version of the MSSQL being used is older than 2012.
* @throws \yii\base\InvalidConfigException
* @throws \yii\db\Exception
* @deprecated 2.0.14 Use [[Schema::getServerVersion]] with [[\version_compare()]].
*/
protected function isOldMssql()
{
return version_compare($this->db->getSchema()->getServerVersion(), '11', '<');
}
/**
* {@inheritdoc}
* @since 2.0.8
*/
public function selectExists($rawSql)
{
return 'SELECT CASE WHEN EXISTS(' . $rawSql . ') THEN 1 ELSE 0 END';
}
/**
* Normalizes data to be saved into the table, performing extra preparations and type converting, if necessary.
* @param string $table the table that data will be saved into.
* @param array $columns the column data (name => value) to be saved into the table.
* @return array normalized columns
*/
private function normalizeTableRowData($table, $columns, &$params)
{
if (($tableSchema = $this->db->getSchema()->getTableSchema($table)) !== null) {
$columnSchemas = $tableSchema->columns;
foreach ($columns as $name => $value) {
// @see https://github.com/yiisoft/yii2/issues/12599
if (isset($columnSchemas[$name]) && $columnSchemas[$name]->type === Schema::TYPE_BINARY && $columnSchemas[$name]->dbType === 'varbinary' && (is_string($value))) {
// @see https://github.com/yiisoft/yii2/issues/12599
$columns[$name] = new Expression('CONVERT(VARBINARY(MAX), ' . ('0x' . bin2hex($value)) . ')');
}
}
}
return $columns;
}
/**
* {@inheritdoc}
* Added OUTPUT construction for getting inserted data (for SQL Server 2005 or later)
* OUTPUT clause - The OUTPUT clause is new to SQL Server 2005 and has the ability to access
* the INSERTED and DELETED tables as is the case with a trigger.
*/
public function insert($table, $columns, &$params)
{
$columns = $this->normalizeTableRowData($table, $columns, $params);
$version2005orLater = version_compare($this->db->getSchema()->getServerVersion(), '9', '>=');
list($names, $placeholders, $values, $params) = $this->prepareInsertValues($table, $columns, $params);
$cols = [];
$outputColumns = [];
if ($version2005orLater) {
/* @var $schema TableSchema */
$schema = $this->db->getTableSchema($table);
foreach ($schema->columns as $column) {
if ($column->isComputed) {
continue;
}
$dbType = $column->dbType;
if (in_array($dbType, ['char', 'varchar', 'nchar', 'nvarchar', 'binary', 'varbinary'])) {
$dbType .= '(MAX)';
}
if ($column->dbType === Schema::TYPE_TIMESTAMP) {
$dbType = $column->allowNull ? 'varbinary(8)' : 'binary(8)';
}
$quoteColumnName = $this->db->quoteColumnName($column->name);
$cols[] = $quoteColumnName . ' ' . $dbType . ' ' . ($column->allowNull ? 'NULL' : '');
$outputColumns[] = 'INSERTED.' . $quoteColumnName;
}
}
$countColumns = count($outputColumns);
$sql = 'INSERT INTO ' . $this->db->quoteTableName($table)
. (!empty($names) ? ' (' . implode(', ', $names) . ')' : '')
. (($version2005orLater && $countColumns) ? ' OUTPUT ' . implode(',', $outputColumns) . ' INTO @temporary_inserted' : '')
. (!empty($placeholders) ? ' VALUES (' . implode(', ', $placeholders) . ')' : $values);
if ($version2005orLater && $countColumns) {
$sql = 'SET NOCOUNT ON;DECLARE @temporary_inserted TABLE (' . implode(', ', $cols) . ');' . $sql .
';SELECT * FROM @temporary_inserted';
}
return $sql;
}
/**
* {@inheritdoc}
* @see https://docs.microsoft.com/en-us/sql/t-sql/statements/merge-transact-sql
* @see https://weblogs.sqlteam.com/dang/2009/01/31/upsert-race-condition-with-merge/
*/
public function upsert($table, $insertColumns, $updateColumns, &$params)
{
$insertColumns = $this->normalizeTableRowData($table, $insertColumns, $params);
/** @var Constraint[] $constraints */
list($uniqueNames, $insertNames, $updateNames) = $this->prepareUpsertColumns($table, $insertColumns, $updateColumns, $constraints);
if (empty($uniqueNames)) {
return $this->insert($table, $insertColumns, $params);
}
if ($updateNames === []) {
// there are no columns to update
$updateColumns = false;
}
$onCondition = ['or'];
$quotedTableName = $this->db->quoteTableName($table);
foreach ($constraints as $constraint) {
$constraintCondition = ['and'];
foreach ($constraint->columnNames as $name) {
$quotedName = $this->db->quoteColumnName($name);
$constraintCondition[] = "$quotedTableName.$quotedName=[EXCLUDED].$quotedName";
}
$onCondition[] = $constraintCondition;
}
$on = $this->buildCondition($onCondition, $params);
list(, $placeholders, $values, $params) = $this->prepareInsertValues($table, $insertColumns, $params);
/**
* Fix number of select query params for old MSSQL version that does not support offset correctly.
* @see QueryBuilder::oldBuildOrderByAndLimit
*/
$insertNamesUsing = $insertNames;
if (strstr($values, 'rowNum = ROW_NUMBER()') !== false) {
$insertNamesUsing = array_merge(['[rowNum]'], $insertNames);
}
$mergeSql = 'MERGE ' . $this->db->quoteTableName($table) . ' WITH (HOLDLOCK) '
. 'USING (' . (!empty($placeholders) ? 'VALUES (' . implode(', ', $placeholders) . ')' : ltrim($values, ' ')) . ') AS [EXCLUDED] (' . implode(', ', $insertNamesUsing) . ') '
. "ON ($on)";
$insertValues = [];
foreach ($insertNames as $name) {
$quotedName = $this->db->quoteColumnName($name);
if (strrpos($quotedName, '.') === false) {
$quotedName = '[EXCLUDED].' . $quotedName;
}
$insertValues[] = $quotedName;
}
$insertSql = 'INSERT (' . implode(', ', $insertNames) . ')'
. ' VALUES (' . implode(', ', $insertValues) . ')';
if ($updateColumns === false) {
return "$mergeSql WHEN NOT MATCHED THEN $insertSql;";
}
if ($updateColumns === true) {
$updateColumns = [];
foreach ($updateNames as $name) {
$quotedName = $this->db->quoteColumnName($name);
if (strrpos($quotedName, '.') === false) {
$quotedName = '[EXCLUDED].' . $quotedName;
}
$updateColumns[$name] = new Expression($quotedName);
}
}
$updateColumns = $this->normalizeTableRowData($table, $updateColumns, $params);
list($updates, $params) = $this->prepareUpdateSets($table, $updateColumns, $params);
$updateSql = 'UPDATE SET ' . implode(', ', $updates);
return "$mergeSql WHEN MATCHED THEN $updateSql WHEN NOT MATCHED THEN $insertSql;";
}
/**
* {@inheritdoc}
*/
public function update($table, $columns, $condition, &$params)
{
return parent::update($table, $this->normalizeTableRowData($table, $columns, $params), $condition, $params);
}
/**
* {@inheritdoc}
*/
public function getColumnType($type)
{
$columnType = parent::getColumnType($type);
// remove unsupported keywords
$columnType = preg_replace("/\s*comment '.*'/i", '', $columnType);
$columnType = preg_replace('/ first$/i', '', $columnType);
return $columnType;
}
/**
* {@inheritdoc}
*/
protected function extractAlias($table)
{
if (preg_match('/^\[.*\]$/', $table)) {
return false;
}
return parent::extractAlias($table);
}
/**
* Builds a SQL statement for dropping constraints for column of table.
*
* @param string $table the table whose constraint is to be dropped. The name will be properly quoted by the method.
* @param string $column the column whose constraint is to be dropped. The name will be properly quoted by the method.
* @param string $type type of constraint, leave empty for all type of constraints(for example: D - default, 'UQ' - unique, 'C' - check)
* @see https://docs.microsoft.com/sql/relational-databases/system-catalog-views/sys-objects-transact-sql
* @return string the DROP CONSTRAINTS SQL
*/
private function dropConstraintsForColumn($table, $column, $type = '')
{
return "DECLARE @tableName VARCHAR(MAX) = '" . $this->db->quoteTableName($table) . "'
DECLARE @columnName VARCHAR(MAX) = '{$column}'
WHILE 1=1 BEGIN
DECLARE @constraintName NVARCHAR(128)
SET @constraintName = (SELECT TOP 1 OBJECT_NAME(cons.[object_id])
FROM (
SELECT sc.[constid] object_id
FROM [sys].[sysconstraints] sc
JOIN [sys].[columns] c ON c.[object_id]=sc.[id] AND c.[column_id]=sc.[colid] AND c.[name]=@columnName
WHERE sc.[id] = OBJECT_ID(@tableName)
UNION
SELECT object_id(i.[name]) FROM [sys].[indexes] i
JOIN [sys].[columns] c ON c.[object_id]=i.[object_id] AND c.[name]=@columnName
JOIN [sys].[index_columns] ic ON ic.[object_id]=i.[object_id] AND i.[index_id]=ic.[index_id] AND c.[column_id]=ic.[column_id]
WHERE i.[is_unique_constraint]=1 and i.[object_id]=OBJECT_ID(@tableName)
) cons
JOIN [sys].[objects] so ON so.[object_id]=cons.[object_id]
" . (!empty($type) ? " WHERE so.[type]='{$type}'" : '') . ")
IF @constraintName IS NULL BREAK
EXEC (N'ALTER TABLE ' + @tableName + ' DROP CONSTRAINT [' + @constraintName + ']')
END";
}
/**
* Drop all constraints before column delete
* {@inheritdoc}
*/
public function dropColumn($table, $column)
{
return $this->dropConstraintsForColumn($table, $column) . "\nALTER TABLE " . $this->db->quoteTableName($table)
. ' DROP COLUMN ' . $this->db->quoteColumnName($column);
}
}