USE database1 SELECT 表名 = CASE a.colorder WHEN 1 THEN c.name ELSE '' END, 序 = a.colorder, 字段名 = a.name, 标识 = CASE COLUMNPROPERTY(a.id,a.name,'IsIdentity') WHEN 1 THEN '√' ELSE '' END, 主键 = CASE WHEN EXISTS ( SELECT * FROM sysobjects WHERE xtype='PK' AND name IN ( SELECT name FROM sysindexes WHERE id=a.id AND indid IN ( SELECT indid FROM sysindexkeys WHERE id=a.id AND colid IN ( SELECT colid FROM syscolumns WHERE id=a.id AND name=a.name ) ) ) ) THEN '√' ELSE '' END, 类型 = b.name, 字节数 = a.length, 长度 = COLUMNPROPERTY(a.id,a.name,'Precision'), 小数 = CASE ISNULL(COLUMNPROPERTY(a.id,a.name,'Scale'),0) WHEN 0 THEN '' ELSE CAST(COLUMNPROPERTY(a.id,a.name,'Scale') AS VARCHAR) END, 允许空 = CASE a.isnullable WHEN 1 THEN '√' ELSE '' END, 默认值 = ISNULL(d.[text],''), 说明 = ISNULL(e.[value],'') FROM syscolumns a LEFT JOIN systypes b ON a.xtype=b.xusertype INNER JOIN sysobjects c ON a.id=c.id AND c.xtype='U' AND c.name<>'dtproperties' LEFT JOIN syscomments d ON a.cdefault=d.id LEFT JOIN sysproperties e ON a.id=e.id AND a.colid=e.smallid ORDER BY c.name, a.colorder
using System; using System.Data; using System.Data.SqlClient; using System.Configuration;namespace TOTO { public class DbClass { private SqlConnection SqlConnection; string _ConnString = "server=127.0.0.1;uid=sa;pwd=123;database=TOTO"; //string _ConnString = ""; /// <summary> /// 设置链接字符串,如果不设置,默认读取WebConfig文件的连接点 /// </summary> public string ConnString { set { _ConnString = value; } } string _ConfigAppSettings = "ConnString"; /// <summary> /// WebConfig数据节点名称,默认为ConnString /// </summary> public string ConfigAppSettings { set { _ConfigAppSettings = value; } } public DbClass() { } #region 初始化数据 /// <summary> /// 初始化数据库链接 /// </summary> private void InitConnection() { if (_ConnString == "") { _ConnString = ConfigurationManager.ConnectionStrings["Conn_DB"].ConnectionString; } if (_ConnString != "" || _ConfigAppSettings != "") { SqlConnection = new SqlConnection(_ConnString); } } /// <summary> /// 初始化数据并打开数据库链接 /// </summary> private void OpenConnection() { InitConnection(); SqlConnection.Open(); } #endregion #region 运行无结果集的Sql语句--ExecutenonQuery
SQLDMO是操作SQLServer的理想的方式,如果您的数据库是SQLServer就可以考虑使用这种方式。在C#中使用SQLDMO需要添加SQLDMO的引用,然后在当前的文件中using SQLDMO;即可以使用SQLDMO。SQLDMO的对象模型大家可以在SQLServer的帮助中获得。 private void GetTabels_DMO(string strServerName,string strUser,string strPWD,string strDatabase)
{
SQLDMO.SQLServer Server = new SQLDMO.SQLServerClass();
//连接到服务器
Server.Connect(strServerName,strUser,strPWD);
//对所有的数据库遍历,获得指定数据库
for(int i=0;i<Server.Databases.Count;i++)
{
//判断当前数据库是否是指定数据库
if(Server.Databases.Item(i+1,"dbo").Name ==strDatabase)
{
//获得指定数据库
SQLDMO._Database db= Server.Databases.Item(i+1,"dbo");
//获得指定数据库中的所有表
for(int j=0;j<db.Tables.Count;j++)
{
MessageBox.Show(db.Tables.Item(j+1,"dbo").Name);
}
}
}
}2、adoxadox是ado Extensions for DDL and Security,是微软对ADO技术的扩展,使用它我们可以操作数据库的结构。它是一个COM组件,估计以后在ADO.NET中会增加ADOX的一些功能。如果大家需要ADOX的一些资料,我可以提供。下面的一个例子就是使用ADOX来获得当前数据库的所有表。 private void GetTables_ADOX()
{
//ADO的数据库连接
ADODB.ConnectionClass cn=new ADODB.ConnectionClass();
string ConnectionString="Provider=SQLOLEDB.1;Integrated Security=SSPI;Initial Catalog=Test;Data Source=HBXP";
cn.Open(ConnectionString,"sa","",0);
//操作ADOX的Catalog对象
CatalogClass cat=new CatalogClass();
cat.ActiveConnection=cn;
for(int i=0;i<cat.Tables.Count;i++)
{
MessageBox.Show(cat.Tables[i].Name);
}
}
注意:在上面的代码中cat.ActiveConnection不能是ADO.Net中的Connection,而应该是ADO的Connection。3、ado.net中的oledbconnection在c#中我们首先会考虑使用ado.net来解决问题,如果没有方法才会考虑使用adox或者sqldmo来解决这个问题。虽然adox和sqldmo也能够解决这个问题,但是他们毕竟是com组件,在.net中使用起来和在非.net平台会有一些差异,不是很顺手。下面的示例就显示了在ado.net中的oledbconnection的方法getoledbschematable来获得数据库的架构。大家可以在msdn中看到这个方法的说明:public DataTable GetOleDbSchemaTable(
Guid schema,
object[] restrictions);
参数
schema
OleDbSchemaGuid 的值之一,它指定要返回的架构表。
restrictions
限制值的 Object 数组。这些值按照限制列的顺序来应用。即,第一个限制值应用于第一个限制列,第二个限制值应用于第二个限制列,依此类推。
返回值
包含请求的架构信息的 DataTable。
更多的信息大家可以查询MSDN,下面将示例如何实现。
private void GetTables_ADONET()
{
//处理OleDbConnection
string strConnectionString=@"Integrated Security=SSPI;Data Source=HBXP;Initial Catalog=Test;Provider=SQLOLEDB.1";
OleDbConnection cn=new OleDbConnection(strConnectionString);
cn.Open();
//利用OleDbConnection的GetOleDbSchemaTable来获得数据库的结构
DataTable dt = cn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables,new object[] {null, null, null, "TABLE"});
foreach (DataRow dr in dt.Rows)
{
MessageBox.Show((String)dr["TABLE_NAME"]);
}
}4、信息架构视图信息架构视图是sql-92 标准中定义的架构视图,这些视图独立于系统表。信息架构视图的最大优点是,即使我们对系统表进行了重要的修改,应用程序也可以正常地使用这些视图进行访问。下面的示例使用信息架构视图来工作。
private void GetTables_INFORMATION_SCHEMA()
{
//打开连接
string strConnectionString=System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
sqlcn=new SqlConnection(strConnectionString);
sqlcn.Open();
//使用信息架构视图
SqlCommand sqlcmd=new SqlCommand("SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = 'BASE TABLE'",sqlcn);
SqlDataReader dr=sqlcmd.ExecuteReader();
while(dr.Read())
{
MessageBox.Show(dr.GetString(0));
}
}5、使用系统表如果您的数据库系统是sqlserver,就可以使用如下的方式来获得当前数据库的所有表: private void GetTables_SystemTable()
{
//打开连接
string strConnectionString=System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
sqlcn=new SqlConnection(strConnectionString);
sqlcn.Open();
//使用信息架构视图
SqlCommand sqlcmd=new SqlCommand("SELECT OBJECT_NAME (id) FROM sysobjects WHERE xtype = 'U' AND OBJECTPROPERTY (id, 'IsMSShipped') = 0",sqlcn);
SqlDataReader dr=sqlcmd.ExecuteReader();
while(dr.Read())
{
MessageBox.Show(dr.GetString(0));
}
}6、使用sqlserver的存储过程“sp_tables”
下面是“盛国军”朋友提出的使用存储过程的方法的补充代码。 public void GetTables_StoredProcedure()
{
//处理OleDbConnection
string strConnectionString=@"Integrated Security=SSPI;Data Source=HBXP;Initial Catalog=Test;Provider=SQLOLEDB.1";
OleDbConnection cn=new OleDbConnection(strConnectionString);
cn.Open();
//执行存储过程
OleDbCommand cmd=new OleDbCommand("sp_tables",cn);
cmd.CommandType=CommandType.StoredProcedure;
OleDbDataReader dr=cmd.ExecuteReader();
while(dr.Read())
{
MessageBox.Show(dr["TABLE_NAME"].ToString());
}
}
USE database1
SELECT
表名 = CASE a.colorder WHEN 1 THEN c.name ELSE '' END,
序 = a.colorder,
字段名 = a.name,
标识 = CASE COLUMNPROPERTY(a.id,a.name,'IsIdentity') WHEN 1 THEN '√' ELSE '' END,
主键 = CASE
WHEN EXISTS (
SELECT *
FROM sysobjects
WHERE xtype='PK' AND name IN (
SELECT name
FROM sysindexes
WHERE id=a.id AND indid IN (
SELECT indid
FROM sysindexkeys
WHERE id=a.id AND colid IN (
SELECT colid
FROM syscolumns
WHERE id=a.id AND name=a.name
)
)
)
)
THEN '√'
ELSE ''
END,
类型 = b.name,
字节数 = a.length,
长度 = COLUMNPROPERTY(a.id,a.name,'Precision'),
小数 = CASE ISNULL(COLUMNPROPERTY(a.id,a.name,'Scale'),0)
WHEN 0 THEN ''
ELSE CAST(COLUMNPROPERTY(a.id,a.name,'Scale') AS VARCHAR)
END,
允许空 = CASE a.isnullable WHEN 1 THEN '√' ELSE '' END,
默认值 = ISNULL(d.[text],''),
说明 = ISNULL(e.[value],'')
FROM syscolumns a
LEFT JOIN systypes b ON a.xtype=b.xusertype
INNER JOIN sysobjects c ON a.id=c.id AND c.xtype='U' AND c.name<>'dtproperties'
LEFT JOIN syscomments d ON a.cdefault=d.id
LEFT JOIN sysproperties e ON a.id=e.id AND a.colid=e.smallid
ORDER BY c.name, a.colorder
using System.Data;
using System.Data.SqlClient;
using System.Configuration;namespace TOTO
{
public class DbClass
{
private SqlConnection SqlConnection; string _ConnString = "server=127.0.0.1;uid=sa;pwd=123;database=TOTO";
//string _ConnString = "";
/// <summary>
/// 设置链接字符串,如果不设置,默认读取WebConfig文件的连接点
/// </summary>
public string ConnString
{
set { _ConnString = value; }
} string _ConfigAppSettings = "ConnString";
/// <summary>
/// WebConfig数据节点名称,默认为ConnString
/// </summary>
public string ConfigAppSettings
{
set { _ConfigAppSettings = value; }
} public DbClass()
{
} #region 初始化数据 /// <summary>
/// 初始化数据库链接
/// </summary>
private void InitConnection()
{
if (_ConnString == "")
{
_ConnString = ConfigurationManager.ConnectionStrings["Conn_DB"].ConnectionString;
}
if (_ConnString != "" || _ConfigAppSettings != "")
{
SqlConnection = new SqlConnection(_ConnString);
}
} /// <summary>
/// 初始化数据并打开数据库链接
/// </summary>
private void OpenConnection()
{
InitConnection();
SqlConnection.Open();
} #endregion #region 运行无结果集的Sql语句--ExecutenonQuery
/// <summary>
/// 执行无结果集的Sql语句,返回Sql影响的记录行数
/// </summary>
/// <param name="strSql">要执行的Sql语句</param>
/// <returns>返回Sql影响的记录行数</returns>
public int ExecuteNonQuery(string strSql)
{
try
{
OpenConnection();
SqlCommand sqlcmd = new SqlCommand(strSql, SqlConnection);
return sqlcmd.ExecuteNonQuery();
}
catch (Exception e)
{
throw e;
}
finally
{
SqlConnection.Close();
}
} /// <summary>
/// 执行无结果集的Sql语句,返回Sql影响的记录行数
/// </summary>
/// <param name="strSql">要执行的Sql语句</param>
/// <param name="sqlParameter">Sql的参数</param>
/// <returns>返回Sql影响的记录行数</returns>
public int ExecuteNonQuery(string strSql, SqlParameter sqlParameter)
{
try
{
OpenConnection();
SqlCommand sqlcmd = new SqlCommand(strSql, SqlConnection);
sqlcmd.Parameters.Add(sqlParameter); return sqlcmd.ExecuteNonQuery();
}
catch (Exception e)
{
throw e;
}
finally
{
SqlConnection.Close();
}
} /// <summary>
/// 执行无结果集的Sql语句,返回Sql影响的记录行数
/// </summary>
/// <param name="strSql">要执行的Sql语句</param>
/// <param name="sqlParameter">Sql的参数集合</param>
/// <returns>返回Sql影响的记录行数</returns>
public int ExecuteNonQuery(string strSql, SqlParameter[] SqlParameters)
{
try
{
OpenConnection();
SqlCommand sqlcmd = new SqlCommand(strSql, SqlConnection);
for (int i = 0; i < SqlParameters.Length; i++)
{
sqlcmd.Parameters.Add(SqlParameters[i]);
}
return sqlcmd.ExecuteNonQuery();
}
catch (Exception e)
{
throw e;
}
finally
{
SqlConnection.Close();
}
}
#endregion #region 按照ExecuteQuery方式运行sql并返回结果集 /// <summary>
/// 运行sql并返回结果集DataSet
/// </summary>
/// <param name="Sql">要运行的Sql语句</param>
/// <returns>sql运行结果集DataSet</returns>
public DataSet ExecuteQuery(string Sql)
{
try
{
OpenConnection();
DataSet ds = new DataSet();
new SqlDataAdapter(Sql, SqlConnection).Fill(ds);
return ds;
}
catch (Exception e)
{
throw e;
}
finally
{
SqlConnection.Close();
}
} /// <summary>
/// 运行sql并返回结果集DataSet
/// </summary>
/// <param name="Sql">要运行的Sql语句</param>
/// <param name="sqlParameter">Sql的参数</param>
/// <returns>sql运行结果集DataSet</returns>
public DataSet ExecuteQuery(string Sql, SqlParameter sqlParameter)
{
try
{
OpenConnection();
DataSet ds = new DataSet();
SqlCommand sqlcmd = new SqlCommand(Sql, SqlConnection);
sqlcmd.Parameters.Add(sqlParameter);
new SqlDataAdapter(sqlcmd).Fill(ds);
return ds;
}
catch (Exception e)
{
throw e;
}
finally
{
SqlConnection.Close();
}
} /// <summary>
/// 运行sql并返回结果集DataSet
/// </summary>
/// <param name="Sql">要运行的Sql语句</param>
/// <param name="sqlParameter">Sql的参数集合</param>
/// <returns>sql运行结果集DataSet</returns>
public DataSet ExecuteQuery(string Sql, SqlParameter[] sqlParameters)
{
try
{
OpenConnection();
DataSet ds = new DataSet();
SqlCommand sqlcmd = new SqlCommand(Sql, SqlConnection);
for (int i = 0; i < sqlParameters.Length; i++)
{
sqlcmd.Parameters.Add(sqlParameters[i]);
}
new SqlDataAdapter(sqlcmd).Fill(ds);
return ds;
}
catch (Exception e)
{
throw e;
}
finally
{
SqlConnection.Close();
}
} #endregion #region 事务模式运行sql
/// <summary>
/// 事务模式运行sql语句的集合
/// </summary>
/// <param name="sqls">要运行sql语句的集合</param>
public void ExecuteTran(string[] sqls)
{
OpenConnection();
SqlTransaction myTrans = SqlConnection.BeginTransaction();
SqlCommand sqlcmd = SqlConnection.CreateCommand();
sqlcmd.Transaction = myTrans;
try
{
for (int i = 0; i < sqls.Length; i++)
{
sqlcmd.CommandText = sqls[i];
sqlcmd.ExecuteNonQuery();
}
myTrans.Commit();
}
catch (Exception e)
{
try
{
myTrans.Rollback();
throw e;
}
catch (SqlException ex)
{
throw ex;
}
}
finally
{
SqlConnection.Close();
}
} #endregion #region 获取数据预设链接的SqlCommand对象 /// <summary>
/// 先获取数据预设链接的SqlConnection对象(未打开链接),通常使用在外部装配类的时候进行事务性处理。
/// </summary>
/// <returns>SqlCommand对象</returns>
public SqlCommand GetSqlCommand()
{
InitConnection();
return SqlConnection.CreateCommand();
} #endregion
}
}
还有个问题呵?
我是使用的是windows 登入?并没有设置用户名,密码??? SQl.Connect(@"20090624-1459\SQLEXPRESS", "", "");我在这句上报错?
什么原因?
改成"."或"(local)"看看
select 表名=name,类型=case xtype when 'S' then '系统表' else '用户表' end from sysobjects
where xtype in('U','S')
oracle 用user_tables
SQl.Connect(@"20090624-1459\SQLEXPRESS; Initial Catalog=false;Integrated Security=true", null, null);
[Microsoft][ODBC SQL Server Driver]无效的连接字符串属性
哪里有错啊?
搞那么复杂做什么..直接两个DropdownList 不就能够绑定数据库和这个库的表了么
方法,不行啊?到底哪里写错错了呢?具体如下:
private string serverName = "TAYO-XGP";
private string userName = "sa";
private string password = "sa";
private string database; public string Database
{
get { return database; }
set { database = value; }
}
protected void Page_Load(object sender, EventArgs e)
{
GetTabels_DMO(serverName,userName,password,Database);
}
private void GetTabels_DMO(string serverName,string userName,string password, string strDatabase)
{
SQLDMO.SQLServer Server = new SQLDMO.SQLServerClass(); //连接到服务器
Server.Connect(serverName,userName,password); //对所有的数据库遍历,获得指定数据库 for(int i=0;i<Server.Databases.Count;i++) { //判断当前数据库是否是指定数据库 if(Server.Databases.Item(i+1,"dbo").Name ==strDatabase) { //获得指定数据库 SQLDMO._Database db= Server.Databases.Item(i+1,"dbo"); //获得指定数据库中的所有表 for(int j=0;j<db.Tables.Count;j++) { DropDownList1.Items.Add (db.Tables.Item(j+1,"dbo").Name); }
}
}
}