MSSQL 是这样 select syscolumns.name AS ColumnName,systypes.name AS TypeName,syscolumns.length as length from syscolumns,sysobjects,systypes where syscolumns.id=sysobjects.id and syscolumns.xtype= systypes.xtype and systypes.name<>'sysname' and sysobjects.name= '表名' order by syscolumns.colid
ACCESS不懂,sql的话,看看邹老大写的: 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],''), 索引名称=isnull(h.索引名称,''), 索引顺序=isnull(h.排序,'') FROM syscolumns a left join systypes b on a.xtype=b.xusertype inner join sysobjects d on a.id=d.id and d.xtype='U' and d.status>=0 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 left join(--这部分是索引信息,如果要显示索引与表及字段的对应关系,可以只要此部分 select 索引名称=a.name,c.id,d.colid ,排序=case indexkey_property(c.id,b.indid,b.keyno,'isdescending') when 1 then '降序' when 0 then '升序' end from sysindexes a join sysindexkeys b on a.id=b.id and a.indid=b.indid join (--这里的作用是有多个索引时,取索引号最小的那个 select id,colid,indid=min(indid) from sysindexkeys group by id,colid) b1 on b.id=b1.id and b.colid=b1.colid and b.indid=b1.indid join sysobjects c on b.id=c.id and c.xtype='U' and c.status>=0 join syscolumns d on b.id=d.id and b.colid=d.colid where a.indid not in(0,255) ) h on a.id=h.id and a.colid=h.colid --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
2楼大佬,您可以简单解说一下您的SQL语句含义吗‘?比如: 表名=case when a.colorder=1 then d.name else '' end, a 是什么?colorder是什么?a.colorder=1又是什么意义? 多谢!
access没系统表吧,你这个需求很难实现
这些Access里都没有的MsysXXX的表都没有权限问的
差点忘了用DataReader可以的到字段名和类型
using (OleDbConnection conn = new OleDbConnection("strConn")) { conn.Open(); using (OleDbDataReader dr = new OleDbCommand("select * from tableName", conn).ExecuteReader()) { for (int i = 0; i < dr.FieldCount; ++i) { dr.GetName(i); //字段名 dr.GetFieldType(i); //字段类型 } } }
select syscolumns.name AS ColumnName,systypes.name AS TypeName,syscolumns.length as length
from syscolumns,sysobjects,systypes where syscolumns.id=sysobjects.id and syscolumns.xtype= systypes.xtype
and systypes.name<>'sysname' and sysobjects.name= '表名' order by syscolumns.colid
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],''),
索引名称=isnull(h.索引名称,''),
索引顺序=isnull(h.排序,'')
FROM syscolumns a
left join systypes b on a.xtype=b.xusertype
inner join sysobjects d on a.id=d.id and d.xtype='U' and d.status>=0
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
left join(--这部分是索引信息,如果要显示索引与表及字段的对应关系,可以只要此部分
select 索引名称=a.name,c.id,d.colid
,排序=case indexkey_property(c.id,b.indid,b.keyno,'isdescending')
when 1 then '降序' when 0 then '升序' end
from sysindexes a
join sysindexkeys b on a.id=b.id and a.indid=b.indid
join (--这里的作用是有多个索引时,取索引号最小的那个
select id,colid,indid=min(indid) from sysindexkeys
group by id,colid) b1 on b.id=b1.id and b.colid=b1.colid and b.indid=b1.indid
join sysobjects c on b.id=c.id and c.xtype='U' and c.status>=0
join syscolumns d on b.id=d.id and b.colid=d.colid
where a.indid not in(0,255)
) h on a.id=h.id and a.colid=h.colid
--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
a 是什么?colorder是什么?a.colorder=1又是什么意义?
多谢!
using (OleDbConnection conn = new OleDbConnection("strConn"))
{
conn.Open();
using (OleDbDataReader dr = new OleDbCommand("select * from tableName", conn).ExecuteReader())
{
for (int i = 0; i < dr.FieldCount; ++i)
{
dr.GetName(i); //字段名
dr.GetFieldType(i); //字段类型
}
}
}
conn.ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\Backup\我的文档\db1.mdb;";
conn.Open(); OleDbDataReader odr = new OleDbCommand("select * from tablename ", conn).ExecuteReader(); DataTable dt = odr.GetSchemaTable();
odr.Close();
conn.Close(); DataGridView grid = new DataGridView();
this.Controls.Add(grid);
grid.Dock = DockStyle.Fill;
grid.BringToFront(); grid.DataSource = dt;
grid.Refresh(); conn.Close();///////////////////////
ColumnName 字段名
ProviderType Access中的字段类型,在access中建一个表然后对照一下。
其他列的含义自己看看应该能明白的。
conn.ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\Backup\我的文档\db1.mdb;";
conn.Open(); OleDbDataReader odr = new OleDbCommand("select * from tablename ", conn).ExecuteReader(); DataTable dt = odr.GetSchemaTable();
odr.Close();
conn.Close(); DataGridView grid = new DataGridView();
this.Controls.Add(grid);
grid.Dock = DockStyle.Fill;
grid.BringToFront(); grid.DataSource = dt;
grid.Refresh(); conn.Close();/////////////////////////
ColumnName 字段名
ProviderType Access中的字段类型,在access中建一个表然后对照一下。
其他列的含义自己看看应该能明白的。
不是原创啊,以前收藏的,原作者记不得了。好象是个老外。
conn.ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\Backup\我的文档\db1.mdb;";
conn.Open(); OleDbDataReader odr = new OleDbCommand("select * from tablename ", conn).ExecuteReader(); DataTable dt = odr.GetSchemaTable();
odr.Close();
conn.Close(); DataGridView grid = new DataGridView();
this.Controls.Add(grid);
grid.Dock = DockStyle.Fill;
grid.BringToFront(); grid.DataSource = dt;
grid.Refresh(); conn.Close();/////////////////////////
ColumnName 字段名
ProviderType Access中的字段类型,在access中建一个表然后对照一下。
其他列的含义自己看看应该能明白的。
不是原创啊,以前收藏的,原作者记不得了。好象是个老外。
DataTable schemaTable = con.GetOleDbSchemaTable(OleDbSchemaGuid.Columns, new object[] { null, null, sTableName, null });
表字段,类型等信息
DataTable key_index = con.GetOleDbSchemaTable(OleDbSchemaGuid.Indexes, new object[] { null, null });
表主键,索引信息