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Code Issues Releases Wiki Activity

[ticket/12012] Correctly drop default value constraints on MSSQL

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We need to drop the default constraints of a column,
before being able to change their type or deleting them.

PHPBB3-12012
This commit is contained in:
Joas Schilling 2014-04-11 17:08:01 +02:00
parent 0da5e3bee9
commit 743d816631
1 changed files with 59 additions and 85 deletions
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144
phpBB/phpbb/db/tools.php
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@ -1846,49 +1846,7 @@ class tools
case 'mssql':
case 'mssqlnative':
$sql = "SELECT CAST(SERVERPROPERTY('productversion') AS VARCHAR(25)) AS mssql_version";
$result = $this->db->sql_query($sql);
$row = $this->db->sql_fetchrow($result);
$this->db->sql_freeresult($result);
// Remove default constraints
if ($row['mssql_version'][0] == '8') // SQL Server 2000
{
// http://msdn.microsoft.com/en-us/library/aa175912%28v=sql.80%29.aspx
// Deprecated in SQL Server 2005
$statements[] = "DECLARE @drop_default_name VARCHAR(100), @cmd VARCHAR(1000)
SET @drop_default_name =
(SELECT so.name FROM sysobjects so
JOIN sysconstraints sc ON so.id = sc.constid
WHERE object_name(so.parent_obj) = '{$table_name}'
AND so.xtype = 'D'
AND sc.colid = (SELECT colid FROM syscolumns
WHERE id = object_id('{$table_name}')
AND name = '{$column_name}'))
IF @drop_default_name <> ''
BEGIN
SET @cmd = 'ALTER TABLE [{$table_name}] DROP CONSTRAINT [' + @drop_default_name + ']'
EXEC(@cmd)
END";
}
else
{
$sql = "SELECT dobj.name AS def_name
FROM sys.columns col
LEFT OUTER JOIN sys.objects dobj ON (dobj.object_id = col.default_object_id AND dobj.type = 'D')
WHERE col.object_id = object_id('{$table_name}')
AND col.name = '{$column_name}'
AND dobj.name IS NOT NULL";
$result = $this->db->sql_query($sql);
$row = $this->db->sql_fetchrow($result);
$this->db->sql_freeresult($result);
if ($row)
{
$statements[] = 'ALTER TABLE [' . $table_name . '] DROP CONSTRAINT [' . $row['def_name'] . ']';
}
}
$statements = $this->mssql_drop_default_constraints($table_name, $column_name);
$statements[] = 'ALTER TABLE [' . $table_name . '] DROP COLUMN [' . $column_name . ']';
break;
@ -2371,52 +2329,12 @@ class tools
case 'mssql':
case 'mssqlnative':
$statements = $this->mssql_drop_default_constraints($table_name, $column_name);
$statements[] = 'ALTER TABLE [' . $table_name . '] ALTER COLUMN [' . $column_name . '] ' . $column_data['column_type_sql'];
if (!empty($column_data['default']))
{
$sql = "SELECT CAST(SERVERPROPERTY('productversion') AS VARCHAR(25)) AS mssql_version";
$result = $this->db->sql_query($sql);
$row = $this->db->sql_fetchrow($result);
$this->db->sql_freeresult($result);
// Using TRANSACT-SQL for this statement because we do not want to have colliding data if statements are executed at a later stage
if ($row['mssql_version'][0] == '8') // SQL Server 2000
{
$statements[] = "DECLARE @drop_default_name VARCHAR(100), @cmd VARCHAR(1000)
SET @drop_default_name =
(SELECT so.name FROM sysobjects so
JOIN sysconstraints sc ON so.id = sc.constid
WHERE object_name(so.parent_obj) = '{$table_name}'
AND so.xtype = 'D'
AND sc.colid = (SELECT colid FROM syscolumns
WHERE id = object_id('{$table_name}')
AND name = '{$column_name}'))
IF @drop_default_name <> ''
BEGIN
SET @cmd = 'ALTER TABLE [{$table_name}] DROP CONSTRAINT [' + @drop_default_name + ']'
EXEC(@cmd)
END
SET @cmd = 'ALTER TABLE [{$table_name}] ADD CONSTRAINT [DF_{$table_name}_{$column_name}_1] {$column_data['default']} FOR [{$column_name}]'
EXEC(@cmd)";
}
else
{
$statements[] = "DECLARE @drop_default_name VARCHAR(100), @cmd VARCHAR(1000)
SET @drop_default_name =
(SELECT dobj.name FROM sys.columns col
LEFT OUTER JOIN sys.objects dobj ON (dobj.object_id = col.default_object_id AND dobj.type = 'D')
WHERE col.object_id = object_id('{$table_name}')
AND col.name = '{$column_name}'
AND dobj.name IS NOT NULL)
IF @drop_default_name <> ''
BEGIN
SET @cmd = 'ALTER TABLE [{$table_name}] DROP CONSTRAINT [' + @drop_default_name + ']'
EXEC(@cmd)
END
SET @cmd = 'ALTER TABLE [{$table_name}] ADD CONSTRAINT [DF_{$table_name}_{$column_name}_1] {$column_data['default']} FOR [{$column_name}]'
EXEC(@cmd)";
}
$statements[] = 'ALTER TABLE [' . $table_name . '] ADD CONSTRAINT [DF_' . $table_name . '_' . $column_name . '_1] ' . $this->db->sql_escape($column_data['default']) . ' FOR [' . $column_name . ']';
}
break;
@ -2551,4 +2469,60 @@ class tools
return $this->_sql_run_sql($statements);
}
/**
* Drop the default constraints of a column
*
* We need to drop the default constraints of a column,
* before being able to change their type or deleting them.
*
* @param string $table_name
* @param string $column_name
* @return array Array with SQL statements
*/
protected function mssql_drop_default_constraints($table_name, $column_name)
{
$statements = array();
$sql = "SELECT CAST(SERVERPROPERTY('productversion') AS VARCHAR(25)) AS mssql_version";
$result = $this->db->sql_query($sql);
$mssql_server_properties = $this->db->sql_fetchrow($result);
$this->db->sql_freeresult($result);
// Remove default constraints
if ($mssql_server_properties['mssql_version'][0] == '8') // SQL Server 2000
{
// http://msdn.microsoft.com/en-us/library/aa175912%28v=sql.80%29.aspx
// Deprecated in SQL Server 2005
$sql = "SELECT so.name AS def_name FROM sysobjects so
JOIN sysconstraints sc ON so.id = sc.constid
WHERE object_name(so.parent_obj) = '{$table_name}'
AND so.xtype = 'D'
AND sc.colid = (SELECT colid FROM syscolumns
WHERE id = object_id('{$table_name}')
AND name = '{$column_name}')";
$result = $this->db->sql_query($sql);
while ($row = $this->db->sql_fetchrow($result))
{
$statements[] = 'ALTER TABLE [' . $table_name . '] DROP CONSTRAINT [' . $row['def_name'] . ']';
}
$this->db->sql_freeresult($result);
}
else
{
$sql = "SELECT dobj.name AS def_name
FROM sys.columns col
LEFT OUTER JOIN sys.objects dobj ON (dobj.object_id = col.default_object_id AND dobj.type = 'D')
WHERE col.object_id = object_id('{$table_name}')
AND col.name = '{$column_name}'
AND dobj.name IS NOT NULL";
$result = $this->db->sql_query($sql);
while ($row = $this->db->sql_fetchrow($result))
{
$statements[] = 'ALTER TABLE [' . $table_name . '] DROP CONSTRAINT [' . $row['def_name'] . ']';
}
$this->db->sql_freeresult($result);
}
return $statements;
}
}