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1.首先找到yii2解析mssql的scheme：

vendor/yiisoft/yii2/db/mssql/Schema.php

2.更改解析代码：

⑴找到findColumns 的函数 大概在232行左右

⑵替代解析 代码如下 ：

/**

* Collects the metadata of table columns.

* @param TableSchema $table the table metadata

* @return boolean whether the table exists in the database

*/

protected function findColumns($table)

{

$pdo = $this->db->getSlavePdo();

$version = explode('.', $pdo->getAttribute(\PDO::ATTR_SERVER_VERSION));

//var_dump($version);exit;

if (intval($version[0]<9)) { 　　$sql = << 　　SELECT 　　column_name = a.name, 　　is_identity = case when exists(SELECT 1 FROM sysobjects where xtype='PK' and parent_obj=a.id and name in ( 　　SELECT name FROM sysindexes WHERE indid in( 　　SELECT indid FROM sysindexkeys WHERE id = a.id AND colid=a.colid))) then 1 else 0 end, 　　data_type = case 　　when b.name in ('ntext','datetime') then b.name 　　when isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0)>0 then

b.name + '(' + convert(varchar(20), COLUMNPROPERTY(a.id,a.name,'PRECISION')) + ','+convert(varchar(10), COLUMNPROPERTY(a.id,a.name,'Scale'))+')'

else b.name + '(' + convert(varchar(20), COLUMNPROPERTY(a.id,a.name,'PRECISION')) + ')' end ,

is_nullable = case when a.isnullable=1 then 'Yes' else 'No' end,

column_default = isnull(e.text,''),

comment = isnull(g.[value],'')

FROM

syscolumns a

left join

systypes b

on

a.xusertype=b.xusertype

inner join

sysobjects d

on

a.id=d.id and d.xtype='U' and d.name<>'dtproperties'

left join

syscomments e

on

a.cdefault=e.id

left join

sysproperties g

on

a.id=g.id and a.colid=g.smallid

left join

sysproperties f

on

d.id=f.id and f.smallid=0

where

d.name='{$table->fullName}'

order by

a.id,a.colorder

SQL2000;

}

else {

$columnsTableName = 'INFORMATION_SCHEMA.COLUMNS';

$whereSql = "[t1].[table_name] = '{$table->name}'";

if ($table->catalogName !== null) {

$columnsTableName = "{$table->catalogName}.{$columnsTableName}";

$whereSql .= " AND [t1].[table_catalog] = '{$table->catalogName}'";

}

if ($table->schemaName !== null) {

$whereSql .= " AND [t1].[table_schema] = '{$table->schemaName}'";

}

$columnsTableName = $this->quoteTableName($columnsTableName);

$sql = << 　　SELECT 　　[t1].[column_name], [t1].[is_nullable], [t1].[data_type], [t1].[column_default], 　　COLUMNPROPERTY(OBJECT_ID([t1].[table_schema] + '.' + [t1].[table_name]), [t1].[column_name], 'IsIdentity') AS is_identity, 　　CONVERT(VARCHAR, [t2].[value]) AS comment 　　FROM {$columnsTableName} AS [t1] 　　LEFT OUTER JOIN [sys].[extended_properties] AS [t2] ON 　　[t2].[minor_id] = COLUMNPROPERTY(OBJECT_ID([t1].[TABLE_SCHEMA] + '.' + [t1].[TABLE_NAME]), [t1].[COLUMN_NAME], 'ColumnID') AND 　　OBJECT_NAME([t2].[major_id]) = [t1].[table_name] AND 　　[t2].[class] = 1 AND 　　[t2].[class_desc] = 'OBJECT_OR_COLUMN' AND 　　[t2].[name] = 'MS_Description' 　　WHERE {$whereSql} 　　SQL; 　　} 　　try { 　　$columns = $this->db->createCommand($sql)->queryAll();

if (empty($columns)) {

return false;

}

} catch (\Exception $e) {

return false;

}

foreach ($columns as $column) {

$column = $this->loadColumnSchema($column);

foreach ($table->primaryKey as $primaryKey) {

if (strcasecmp($column->name, $primaryKey) === 0) {

$column->isPrimaryKey = true;

break;

}

}

if ($column->isPrimaryKey && $column->autoIncrement) {

$table->sequenceName = '';

}

$table->columns[$column->name] = $column;

}

return true;

}

3.分析这段代码：

⑴获取数据库的版本：

$pdo = $this->db->getSlavePdo();

$version = explode('.', $pdo->getAttribute(\PDO::ATTR_SERVER_VERSION));

⑵根据版本解析：

if (intval($version[0]<9)) { }else{} 　　⑶解析sql2000： 　　$sql = << 　　SELECT 　　column_name = a.name, 　　is_identity = case when exists(SELECT 1 FROM sysobjects where xtype='PK' and parent_obj=a.id and name in ( 　　SELECT name FROM sysindexes WHERE indid in( 　　SELECT indid FROM sysindexkeys WHERE id = a.id AND colid=a.colid))) then 1 else 0 end, 　　data_type = case 　　when b.name in ('ntext','datetime') then b.name 　　when isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0)>0 then

b.name + '(' + convert(varchar(20), COLUMNPROPERTY(a.id,a.name,'PRECISION')) + ','+convert(varchar(10), COLUMNPROPERTY(a.id,a.name,'Scale'))+')'

else b.name + '(' + convert(varchar(20), COLUMNPROPERTY(a.id,a.name,'PRECISION')) + ')' end ,

is_nullable = case when a.isnullable=1 then 'Yes' else 'No' end,

column_default = isnull(e.text,''),

comment = isnull(g.[value],'')

FROM

syscolumns a

left join

systypes b

on

a.xusertype=b.xusertype

inner join

sysobjects d

on

a.id=d.id and d.xtype='U' and d.name<>'dtproperties'

left join

syscomments e

on

a.cdefault=e.id

left join

sysproperties g

on

a.id=g.id and a.colid=g.smallid

left join

sysproperties f

on

d.id=f.id and f.smallid=0

where

d.name='{$table->fullName}'

order by

a.id,a.colorder

SQL2000;

⑷else 就是原来的解析方式 3.打开sql的数据库scheme的缓存，在db.php文件中添加 ：'enableSchemaCache'=>true 既可以。

以上就是Yii2中mssql和sql server数据库如何使用，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注创新互联行业资讯频道。

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