数据库字段格式

你是指获取字段的类型?

--查询出各（某）表字段的属性

SQL code

--sql server 2000
SELECT 
    表名       = case when a.colorder=1 then d.name else '' end,
    表说明     = case when a.colorder=1 then isnull(f.value,'') else '' end,
    字段序号   = a.colorder,
    字段名     = a.name,
    标识       = case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end,
    主键       = 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 '√' else '' end,
    类型       = b.name,
    占用字节数 = a.length,
    长度       = COLUMNPROPERTY(a.id,a.name,'PRECISION'),
    小数位数   = isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0),
    允许空     = case when a.isnullable=1 then '√'else '' end,
    默认值     = isnull(e.text,''),
    字段说明   = 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='要查询的表' --如果只查询指定表,加上此条件
order by 
    a.id,a.colorder

/*
表名    表说明 字段序号 字段名    标识 主键    类型    占用字节数 长度 小数位数 允许空  默认值      字段说明 
------- ----- -------  -------- ---- ------- ------ ------- --------------- ------ ---------- ---------- 
authors       1        au_id          √     id      11     11      0                          
              2        au_lname              varchar 40     40      0                          
              3        au_fname              varchar 20     20      0                          
              4        phone                 char    12     12      0              ('UNKNOWN') 
              5        address               varchar 40     40      0       √                 
              6        city                  varchar 20     20      0       √                 
              7        state                 char    2      2       0       √                 
              8        zip                   char    5      5       0       √                 
              9        contract              bit     1      1       0                          
（所影响的行数为 9 行）
*/

SQL code

--sql server 2005
-- 1. 表结构信息查询 
-- ========================================================================
-- 表结构信息查询
-- 邹建 2005.08(引用请保留此信息)
-- ========================================================================
SELECT 
    TableName=CASE WHEN C.column_id=1 THEN O.name ELSE N'' END,
    TableDesc=ISNULL(CASE WHEN C.column_id=1 THEN PTB.[value] END,N''),
    Column_id=C.column_id,
    ColumnName=C.name,
    PrimaryKey=ISNULL(IDX.PrimaryKey,N''),
    [IDENTITY]=CASE WHEN C.is_identity=1 THEN N'√'ELSE N'' END,
    Computed=CASE WHEN C.is_computed=1 THEN N'√'ELSE N'' END,
    Type=T.name,
    Length=C.max_length,
    Precision=C.precision,
    Scale=C.scale,
    NullAble=CASE WHEN C.is_nullable=1 THEN N'√'ELSE N'' END,
    [Default]=ISNULL(D.definition,N''),
    ColumnDesc=ISNULL(PFD.[value],N''),
    IndexName=ISNULL(IDX.IndexName,N''),
    IndexSort=ISNULL(IDX.Sort,N''),
    Create_Date=O.Create_Date,
    Modify_Date=O.Modify_date
FROM sys.columns C
    INNER JOIN sys.objects O
        ON C.[object_id]=O.[object_id]
            AND O.type='U'
            AND O.is_ms_shipped=0
    INNER JOIN sys.types T
        ON C.user_type_id=T.user_type_id
    LEFT JOIN sys.default_constraints D
        ON C.[object_id]=D.parent_object_id
            AND C.column_id=D.parent_column_id
            AND C.default_object_id=D.[object_id]
    LEFT JOIN sys.extended_properties PFD
        ON PFD.class=1 
            AND C.[object_id]=PFD.major_id 
            AND C.column_id=PFD.minor_id
--             AND PFD.name='Caption'  -- 字段说明对应的描述名称(一个字段可以添加多个不同name的描述)
 LEFT JOIN sys.extended_properties PTB
        ON PTB.class=1 
            AND PTB.minor_id=0 
            AND C.[object_id]=PTB.major_id
--             AND PFD.name='Caption'  -- 表说明对应的描述名称(一个表可以添加多个不同name的描述) 
 LEFT JOIN -- 索引及主键信息
    (
        SELECT 
            IDXC.[object_id],
            IDXC.column_id,
            Sort=CASE INDEXKEY_PROPERTY(IDXC.[object_id],IDXC.index_id,IDXC.index_column_id,'IsDescending')
                WHEN 1 THEN 'DESC' WHEN 0 THEN 'ASC' ELSE '' END,
            PrimaryKey=CASE WHEN IDX.is_primary_key=1 THEN N'√'ELSE N'' END,
            IndexName=IDX.Name
        FROM sys.indexes IDX
        INNER JOIN sys.index_columns IDXC
            ON IDX.[object_id]=IDXC.[object_id]
                AND IDX.index_id=IDXC.index_id
        LEFT JOIN sys.key_constraints KC
            ON IDX.[object_id]=KC.[parent_object_id]
                AND IDX.index_id=KC.unique_index_id
        INNER JOIN -- 对于一个列包含多个索引的情况,只显示第1个索引信息
        (
            SELECT [object_id], Column_id, index_id=MIN(index_id)
            FROM sys.index_columns
            GROUP BY [object_id], Column_id
        ) IDXCUQ
            ON IDXC.[object_id]=IDXCUQ.[object_id]
                AND IDXC.Column_id=IDXCUQ.Column_id
                AND IDXC.index_id=IDXCUQ.index_id
    ) IDX
        ON C.[object_id]=IDX.[object_id]
            AND C.column_id=IDX.column_id 
-- WHERE O.name=N'要查询的表'       -- 如果只查询指定表,加上此条件
ORDER BY O.name,C.column_id 

-- 2. 索引及主键信息 
-- ========================================================================
-- 索引及主键信息
-- 邹建 2005.08(引用请保留此信息)
-- ========================================================================
SELECT 
    TableId=O.[object_id],
    TableName=O.Name,
    IndexId=ISNULL(KC.[object_id],IDX.index_id),
    IndexName=IDX.Name,
    IndexType=ISNULL(KC.type_desc,'Index'),
    Index_Column_id=IDXC.index_column_id,
    ColumnID=C.Column_id,
    ColumnName=C.Name,
    Sort=CASE INDEXKEY_PROPERTY(IDXC.[object_id],IDXC.index_id,IDXC.index_column_id,'IsDescending')
        WHEN 1 THEN 'DESC' WHEN 0 THEN 'ASC' ELSE '' END,
    PrimaryKey=CASE WHEN IDX.is_primary_key=1 THEN N'√'ELSE N'' END,
    [UQIQUE]=CASE WHEN IDX.is_unique=1 THEN N'√'ELSE N'' END,
    Ignore_dup_key=CASE WHEN IDX.ignore_dup_key=1 THEN N'√'ELSE N'' END,
    Disabled=CASE WHEN IDX.is_disabled=1 THEN N'√'ELSE N'' END,
    Fill_factor=IDX.fill_factor,
    Padded=CASE WHEN IDX.is_padded=1 THEN N'√'ELSE N'' END
FROM sys.indexes IDX
    INNER JOIN sys.index_columns IDXC
        ON IDX.[object_id]=IDXC.[object_id]
            AND IDX.index_id=IDXC.index_id
    LEFT JOIN sys.key_constraints KC
        ON IDX.[object_id]=KC.[parent_object_id]
            AND IDX.index_id=KC.unique_index_id
    INNER JOIN sys.objects O
        ON O.[object_id]=IDX.[object_id]
    INNER JOIN sys.columns C
        ON O.[object_id]=C.[object_id]
            AND O.type='U'
            AND O.is_ms_shipped=0
            AND IDXC.Column_id=C.Column_id
--    INNER JOIN  -- 对于一个列包含多个索引的情况,只显示第1个索引信息
--    (
--        SELECT [object_id], Column_id, index_id=MIN(index_id)
--        FROM sys.index_columns
--        GROUP BY [object_id], Column_id
--    ) IDXCUQ
--        ON IDXC.[object_id]=IDXCUQ.[object_id]
--            AND IDXC.Column_id=IDXCUQ.Column_id