发布个人版的C#数据库操作类源码
一直以来,我都是习惯用Vb.net来开发网站。但最近与俺相处了3年的同事调走了,部分的项目由我来接管,他较擅长C#,因此近段时间恶补C#的东西。以前我写过几个Vb.net版的数据库访问类——其实我觉得叫模块更为合适,前天试着把它转为C#版。不妥之处望大家能提出改进意见,具体原码如下:
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/// <summary>
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/// SqlDbAccessVCsharp 的摘要说明。
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/// </summary>
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public class SqlDbAccessVCsharp
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{
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/// <summary>
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/// _ConectionString 局部变量:连接字符串。
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/// </summary>
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private string _ConectionString;
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/// <summary>
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/// _QuryValue 局部变量:查询结果,数据类型32位整型数。
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/// </summary>
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private Int32 _IntQuryValue;
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/// <summary>
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/// SqlConnection局部变量:查询结果,数据类型字符串。
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/// </summary>
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private String _StrQuryValue;
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/// <summary>
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/// SqlConnection 局部变量:数据库连接。
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/// </summary>
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private SqlConnection CurrentConnection=new SqlConnection();
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/// <summary>
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/// SqlCmd 局部变量:SqlCommand。
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/// </summary>
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private SqlCommand SqlCmd ;
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/// <summary>
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/// MyDataSet 局部变量:DataSet。
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/// </summary>
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private DataSet MyDataSet=new DataSet();
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/// <summary>
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/// MySqlDataReader 局部变量:SqlDataReader。
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/// </summary>
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private SqlDataReader MySqlDataReader;
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/// <summary>
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/// MySqlDataAdapter 局部变量:SqlDataAdapter。
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/// </summary>
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private SqlDataAdapter MySqlDataAdapter;
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/// <summary>
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/// _CurrentPageCode 局部变量:String。
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/// </summary>
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private int _CurrentPageCode;
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/// <summary>
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/// ConectionString 属性:连接字符串。
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/// </summary>
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public string ConectionString
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{
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get{
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return _ConectionString;
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}
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set{
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_ConectionString=value;
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}
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}
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/// <summary>
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/// IntQuryValue 属性:整型查询结果。
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/// </summary>
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public Int32 IntQuryValue
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{
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get
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{
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return _IntQuryValue;
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}
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set
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{
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_IntQuryValue=value;
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}
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}
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/// <summary>
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/// StrQuryValue 属性:字符串查询结果。
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/// </summary>
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public string StrQuryValue
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{
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get
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{
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return _StrQuryValue;
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}
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set
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{
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_StrQuryValue=value;
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}
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}
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/// <summary>
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/// CurrentPageCode 属性:当前页。
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/// </summary>
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public int CurrentPageCode
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{
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get
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{
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return _CurrentPageCode;
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}
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set
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{
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_CurrentPageCode=value;
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}
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}
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/// <summary>
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/// ConnectToDb 打开数据库连接。
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/// </summary>
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/// <paramref name="Errmsg">
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/// 返回值:错误信息。
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/// </paramref>
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public bool ConnectToDb(ref string ErrMsg)
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{
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try
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{
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if ( ( CurrentConnection.State== ConnectionState.Broken)||( CurrentConnection.State== ConnectionState.Closed))
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{
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CurrentConnection.ConnectionString =ConectionString;
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CurrentConnection.Open();
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}
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return true;
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}
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catch (SqlException e)
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{
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ErrMsg = e.ToString();
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ErrMsg = ErrMsg.Replace("\r", "");
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ErrMsg = ErrMsg.Replace("\n", "");
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return false;
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}
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}
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/// <summary>
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/// CloseDb 关闭数据库连接。
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/// </summary>
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/// <paramref name="Errmsg">
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/// 返回值:错误信息。
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/// </paramref>
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public bool CloseDb(ref string ErrMsg)
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{
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try
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{
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if ( ( CurrentConnection.State!= ConnectionState.Broken) &&( CurrentConnection.State!= ConnectionState.Closed))
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{
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CurrentConnection.Close();
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CurrentConnection.Dispose();
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}
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return true;
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}
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catch (SqlException e)
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{
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ErrMsg = e.ToString();
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ErrMsg = ErrMsg.Replace("\r", "");
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ErrMsg = ErrMsg.Replace("\n", "");
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return false;
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}
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}
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/// <summary>
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/// ExecuteSql 执行Sql命令。
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/// </summary>
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/// <param name="SqlStr">
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/// 传入参数:Sql语句
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/// </param>
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/// <paramref name="Errmg">
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/// 引用参数:错误信息
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/// </paramref>
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public bool ExecuteSql(string SqlStr,ref string ErrMsg)
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{
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try
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{
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if (ConnectToDb(ref ErrMsg) == true)
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{
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SqlCmd=new SqlCommand(SqlStr,CurrentConnection);
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SqlCmd.ExecuteNonQuery();
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SqlCmd.Dispose();
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CloseDb(ref ErrMsg);
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return true;
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}
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else
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return false;
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}
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catch (SqlException e)
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{
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ErrMsg = e.ToString();
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ErrMsg = ErrMsg.Replace("\r", "");
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ErrMsg = ErrMsg.Replace("\n", "");
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return false;
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}
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}
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/// <summary>
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/// QuerySingleIntValue 查询出一个单值。
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/// </summary>
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/// <param name="SqlStr">
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/// 传入参数:Sql语句。
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/// </param>
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/// <paramref name="Errmg">
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/// 引用参数:错误信息。
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/// </paramref>
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public bool QuerySingleIntValue(string SqlStr,ref string ErrMsg)
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{
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try
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{
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if (ConnectToDb(ref ErrMsg) == true)
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{
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SqlCmd=new SqlCommand(SqlStr,CurrentConnection);
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MySqlDataReader=SqlCmd.ExecuteReader();
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while(MySqlDataReader.Read())
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{
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IntQuryValue =Convert.ToInt32(MySqlDataReader[0]);
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}
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MySqlDataReader.Close();
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SqlCmd.Dispose();
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CloseDb(ref ErrMsg);
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return true;
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}
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return false;
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}
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catch (SqlException e)
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{
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ErrMsg = e.ToString();
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ErrMsg = ErrMsg.Replace("\r", "");
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ErrMsg = ErrMsg.Replace("\n", "");
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return false;
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}
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}
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/// <summary>
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/// QuerySingleStrValue 查询出一个单值。
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/// </summary>
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/// <param name="SqlStr">
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/// 传入参数:Sql语句。
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/// </param>
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/// <paramref name="Errmg">
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/// 引用参数:错误信息。
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/// </paramref>
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public bool QuerySingleStrValue(string SqlStr,ref string ErrMsg)
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{
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try
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{
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if (ConnectToDb(ref ErrMsg) == true)
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{
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SqlCmd=new SqlCommand(SqlStr,CurrentConnection);
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MySqlDataReader=SqlCmd.ExecuteReader();
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while(MySqlDataReader.Read())
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{
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StrQuryValue = Convert.ToString(MySqlDataReader[0]);
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}
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MySqlDataReader.Close();
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SqlCmd.Dispose();
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CloseDb(ref ErrMsg);
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return true;
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}
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return false;
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}
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catch (SqlException e)
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{
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ErrMsg = e.ToString();
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ErrMsg = ErrMsg.Replace("\r", "");
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ErrMsg = ErrMsg.Replace("\n", "");
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return false;
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}
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}
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/// <summary>
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/// MoreValueQuery 查询出多值。
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/// </summary>
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/// <param name="SqlStr">
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/// 查询语句
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/// </param>
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/// <param name="FieldCount">
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/// 读取字段数
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/// </param>
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///<paramref name="ValueArrlist">
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///引用参数:查询结果,保存在动态数组当中。
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///</paramref>
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///<paramref name="ErrMsg">
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///引用参数:错误信息。
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///</paramref>
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public bool MoreValueQuery(string SqlStr,int FieldCount,ref ArrayList ValueArrlist,string ErrMsg)
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{
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try
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{
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if (ConnectToDb(ref ErrMsg) == true)
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{
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SqlCmd=new SqlCommand(SqlStr,CurrentConnection);
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MySqlDataReader=SqlCmd.ExecuteReader();
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while(MySqlDataReader.Read())
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{
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for (int i = 0; i <= FieldCount-1; i++)
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{
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if (!MySqlDataReader.IsDBNull(i))
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{
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ValueArrlist.Add("无");
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}
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else
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{
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ValueArrlist.Add(MySqlDataReader.GetString(i));
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}
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}
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}
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MySqlDataReader.Close();
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SqlCmd.Dispose();
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CloseDb(ref ErrMsg);
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return true;
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}
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return false;
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}
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catch (SqlException e)
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{
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ErrMsg = e.ToString();
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ErrMsg = ErrMsg.Replace("\r", "");
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ErrMsg = ErrMsg.Replace("\n", "");
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return false;
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}
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}
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public DataView GetTableData(int PageShow,string SqlStr,string TableName,ref string ErrMsg)
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{
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try
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{
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if (ConnectToDb(ref ErrMsg) == true)
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{
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int StartIndex=0;
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MySqlDataAdapter=new SqlDataAdapter(SqlStr,CurrentConnection);
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if (PageShow==0)
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{
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MySqlDataAdapter.Fill(MyDataSet,TableName);
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}
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else
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{
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StartIndex = CurrentPageCode * PageShow;
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MySqlDataAdapter.Fill(MyDataSet,StartIndex,PageShow,TableName);
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}
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DataView MyDataView;//=new DataView();
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MyDataView = MyDataSet.Tables[TableName].DefaultView;
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SqlCmd.Dispose();
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CloseDb(ref ErrMsg);
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return MyDataView;
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}
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else
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return null;
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}
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catch (SqlException e)
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{
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ErrMsg = e.ToString();
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ErrMsg = ErrMsg.Replace("\r", "");
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ErrMsg = ErrMsg.Replace("\n", "");
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return null;
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}
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}
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}
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