SQL DDL一次性生成全库建表语句(包括字段默认值，主键约束等内容）

╰+哭是因爲堅強的太久メ 2023-10-04 13:11 5阅读 0赞

select  'CREATE TABLE [' + so.name + '] (' + o.list + ')' + CASE WHEN tc.Constraint_Name IS NULL THEN '' ELSE 'ALTER TABLE ' + so.Name + ' ADD CONSTRAINT ' + tc.Constraint_Name  + ' PRIMARY KEY ' + ' (' + LEFT(j.List, Len(j.List)-1) + ')' END
    from    sysobjects so
    cross apply
        (SELECT 
            '  ['+column_name+'] ' + 
            data_type + case data_type
                    when 'sql_variant' then ''
                    when 'text' then ''
                    when 'decimal' then '(' + cast(numeric_precision as varchar) + ', ' + cast(numeric_scale as varchar) + ')'
                    else coalesce('('+case when character_maximum_length = -1 then 'MAX' else cast(character_maximum_length as varchar) end +')','') end + ' ' +
            case when exists ( 
            select id from syscolumns
            where object_name(id)=so.name
            and name=column_name
            and columnproperty(id,name,'IsIdentity') = 1 
            ) then
            'IDENTITY(' + 
            cast(ident_seed(so.name) as varchar) + ',' + 
            cast(ident_incr(so.name) as varchar) + ')'
            else ''
            end + ' ' +
             (case when IS_NULLABLE = 'No' then 'NOT ' else '' end ) + 'NULL ' + 
              case when information_schema.columns.COLUMN_DEFAULT IS NOT NULL THEN 'DEFAULT '+ information_schema.columns.COLUMN_DEFAULT ELSE '' END + ', ' 
     
         from information_schema.columns where table_name = so.name
         order by ordinal_position
        FOR XML PATH('')) o (list)
    left join
        information_schema.table_constraints tc
    on  tc.Table_name               = so.Name
    AND tc.Constraint_Type  = 'PRIMARY KEY'
    cross apply
        (select '[' + Column_Name + '], '
         FROM       information_schema.key_column_usage kcu
         WHERE      kcu.Constraint_Name     = tc.Constraint_Name
         ORDER BY
            ORDINAL_POSITION
         FOR XML PATH('')) j (list)
    where   xtype = 'U'
    AND name  NOT IN ('dtproperties') --排除掉dtproperties表

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[20210511235838893.png]: https://img-blog.csdnimg.cn/20210511235838893.png