相关方法如下：
///// <summary>
///// 获得数据列表
///// </summary>
public DataSet GetList(string strWhere)
{
StringBuilder strSql = new StringBuilder();
strSql.Append("select OpenGameNumID,OpenNumName,OpenNum,Remark ");
strSql.Append(" FROM OpenGameNum ");
if (strWhere.Trim() != "")
{
strSql.Append(" where " + strWhere);
}
using (SqlDataReader rdr = SqlHelper2.ExecuteReader(SqlHelper2.ConnectionStringLocalTransaction, CommandType.Text, strSql.ToString(), null))
{
while (rdr.Read())
{
ds = ConvertDataReaderToDataSet(rdr);//这边的rdr的值已经少了一条了
}
}
//DataSet ds = SqlHelper2.ExecuteDataSet(SqlHelper2.ConnectionStringLocalTransaction, CommandType.Text, strSql.ToString(), null);
//用这种方法查询出来的结果是正确的
return ds;
}
以下为最终调用的方法：
/// <summary>
/// Execute a SqlCommand that returns a resultset against the database specified in the connection string
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
/// SqlDataReader r = ExecuteReader(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString">a valid connection string for a SqlConnection</param>
/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
/// <param name="commandText">the stored procedure name or T-SQL command</param>
/// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
/// <returns>A SqlDataReader containing the results</returns>
public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
SqlConnection conn = new SqlConnection(connectionString);
SqlDataReader rdr = null;
// we use a try/catch here because if the method throws an exception we want to
// close the connection throw code, because no datareader will exist, hence the
// commandBehaviour.CloseConnection will not work
try
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
//cmd.Parameters.Clear();
return rdr;
}
catch
{
conn.Close();
throw;
}
}
相关的个方法：
/// <summary>
/// Prepare a command for execution
/// </summary>
/// <param name="cmd">SqlCommand object</param>
/// <param name="conn">SqlConnection object</param>
/// <param name="trans">SqlTransaction object</param>
/// <param name="cmdType">Cmd type e.g. stored procedure or text</param>
/// <param name="cmdText">Command text, e.g. Select * from Products</param>
/// <param name="cmdParms">SqlParameters to use in the command</param>
private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
{
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.Connection = conn;
cmd.CommandText = cmdText;
if (trans != null)
cmd.Transaction = trans;
cmd.CommandType = cmdType;
if (cmdParms != null)
{
foreach (SqlParameter parm in cmdParms)
cmd.Parameters.Add(parm);
}
}
/// <summary>
/// 执行SQL语句并返回DataSet
/// </summary>
/// <param name="Sqlstr">SQL语句</param>
/// <returns></returns>
public static DataSet ExecuteDataSet(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
DataSet ds = new DataSet();
using (SqlConnection conn = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
SqlDataAdapter da = new SqlDataAdapter(cmdText, conn);
da.Fill(ds);
conn.Close();
return ds;
}
}
请高手指点！
