利用数据集实现对数据库的操作

新客网 XKER.COM 2004-12-08 来源：收藏本文

/// <summary>
/// 说明: 本类主要实现对数据库的操作(查询|SP)
/// 建立者: 黄宗银
/// 建立时间: 2004-12-4
/// </summary>
public class DB
{
/// <summary>
/// 从数据库查询数据
/// </summary>
/// <param name="Columns">查询列名</param>
/// <param name="Target">查询目标</param>
/// <param name="PKColumn">主键列名</param>
/// <param name="PKValue">主键值</param>
/// <param name="Q">是否加引号</param>
/// <param name="strEx">异常信息</param>
/// <returns>返回查询结果</returns>
public static DataView GetDBData( string Columns, string Target, string PKColumn, string PKValue, bool Q, ref string strEx )
{
string strCondition = "[" + PKColumn + "] = ";
if( Q )
{
strCondition += "'" + PKValue + "'";
}
else
{
strCondition += PKValue;
}

DataSet ds = GetDBData( Columns, Target, strCondition, ref strEx );

if( strEx != string.Empty )
{
return null;
}

return ds.Tables[0].DefaultView;
}

/// <summary>
/// 从数据库查询数据
/// </summary>
/// <param name="Columns">查询列名</param>
/// <param name="Target">查询目标</param>
/// <param name="Condition">查询条件</param>
/// <param name="strEx">异常信息</param>
/// <returns>查询结果</returns>
public static DataSet GetDBData( string Columns, string Target, string Condition, ref string strEx )
{
strEx = string.Empty;
string strConnect = ConfigurationSettings.AppSettings["ConnectString"];
SqlConnection sqlConnection = new SqlConnection( strConnect );
try
{
string strQuery = "SELECT " + Columns + "FROM [" + Target + "]";

if( Condition.Trim() != string.Empty )
{
strQuery += "WHERE [" + Condition;
}

SqlDataAdapter sqlDataAdapter = new SqlDataAdapter( strQuery, sqlConnection );

DataSet ds = new DataSet();
sqlDataAdapter.Fill( ds );

sqlConnection.Close();
return ds;
}
catch( SqlException ex )
{
sqlConnection.Close();
strEx = ex.Message;
return null;
}
}

/// <summary>
/// 执行某个存储过程
/// </summary>
/// <param name="SP">存储过程名</param>
/// <param name="xsd">数据集对象</param>
/// <param name="strEx">异常信息</param>
/// <returns>执行结果</returns>
public static void ExecSP( string SP, DataSet xsd, ref string strEx )
{
string strConnect = ConfigurationSettings.AppSettings["ConnectString"];
SqlConnection sqlConnection = new SqlConnection( strConnect );

try
{
SqlDataAdapter sqlDataAdapter = new SqlDataAdapter( SP, sqlConnection );
sqlDataAdapter.SelectCommand.CommandType = CommandType.StoredProcedure;

for( int i = 0; i < xsd.Tables["IN"].Columns.Count; i++ )
{
string strColumnName = xsd.Tables["IN"].Columns[i].ColumnName;
sqlDataAdapter.SelectCommand.Parameters.Add( "@" + strColumnName, (xsd.Tables["IN"].Rows[0])[i] );
}

for( int j = 0; j < xsd.Tables["OUT"].Columns.Count; j++ )
{
string strColumnName = xsd.Tables["OUT"].Columns[j].ColumnName;
sqlDataAdapter.SelectCommand.Parameters.Add( "@" + strColumnName, xsd.Tables["OUT"].Columns[j].DataType );
sqlDataAdapter.SelectCommand.Parameters["@" + strColumnName].Direction = ParameterDirection.Output;
}

sqlDataAdapter.Fill( xsd, "OUT" );
}
catch( SqlException ex )
{
strEx = ex.Message;
}
finally
{
sqlConnection.Close();
}
}
}

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