VB.NET中Ssqlhelper类

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'**********************************************'说明: 用于封装增 删 改 查 的 操作，在DAL层用的时候直接调用即可'命名空间：SqlHelper'机器名称：晓'创建日期：2014/12/15 16:41:31'作者：郑浩'版本号：V1.00'**********************************************Imports System.DataImports System.Data.SqlClientImports System.Configuration  '必须要在管理器中添加引用  Public Class SqlHelper    '定义全局变量变量，获得数据库的连接字符串                                                              Private Shared ReadOnly strConnection As String = ConfigurationManager.AppSettings("ConnStr")    '定义全局变量，设置连接        Shared conn As SqlConnection = New SqlConnection(strConnection)    '定义全局cmd命令        Shared cmd As New SqlCommand    ''' <summary>        ''' 执行非查询操作（增删改）有参数，        ''' </summary>        ''' <param name="cmdText">执行增删改查SQL语句或者存储过程</param>        ''' <param name="cmdType">命令类型文本或者是存储过程</param>        ''' <param name="paras">参数数组,无法确认有多少参数</param>        ''' <returns></returns>        ''' <remarks></remarks>        Public Shared Function ExecuteNoQuery(ByVal cmdText As String, ByVal cmdType As CommandType, ByVal paras As SqlParameter()) As Integer        '将传入的值,分别为cmd的属性赋值          Dim result As Integer   '定义变量用来存放执行的结果        cmd.Parameters.AddRange(paras)   '将参数传入            cmd.CommandType = cmdType            '设置一个值,解释cmdText            cmd.Connection = conn                '设置连接,全局变量            cmd.CommandText = cmdText            '设置查询的语句            Try            conn.Open()                      '打开连接                result = cmd.ExecuteNonQuery()     '执行增删改操作                cmd.Parameters.Clear()           '清除参数            Catch ex As Exception            MsgBox(ex.Message, , "数据库操作")                        '如果出错,返回0            Finally            '关闭数据连接            Call CloseConn(conn)            Call CloseCmd(cmd)        End Try        Return result        '返回受影响的行数    End Function    ''' <summary>        ''' 执行增删改三个操作,(无参)        ''' </summary>        ''' <param name="cmdText">需要执行语句,一般是Sql语句,也有存储过程</param>        ''' <param name="cmdType">判断Sql语句的类型,一般都不是存储过程</param>        ''' <returns>Interger,受影响的行数</returns>        Public Shared Function ExecAddDelUpdateNo(ByVal cmdText As String, ByVal cmdType As CommandType) As Integer        '为要执行的命令cmd赋值            cmd.CommandText = cmdText       '先是查询的sql语句            cmd.CommandType = cmdType       '设置Sql语句如何解释            cmd.Connection = conn           '设置连接            Dim result As Integer        '执行操作            Try            conn.Open()            result = cmd.ExecuteNonQuery()        Catch ex As Exception            MsgBox(ex.Message, , "数据库操作")        Finally            Call CloseConn(conn)              Call CloseCmd(cmd)        End Try        Return result          '返回受影响的行数    End Function    '''' <summary>      '''' 执行查询的操作,(有参),参数不限        '''' </summary>        ''' <param name="cmdText">需要执行语句,一般是Sql语句,也有存储过程</param>        ''' <param name="cmdType">判断Sql语句的类型,一般都不是存储过程</param>        ''' <param name="paras">传入的参数</param>        ''' <returns></returns>        ''' <remarks></remarks>        Public Shared Function ExecSelect(ByVal cmdText As String, ByVal cmdType As CommandType, ByVal paras As SqlParameter()) As DataTable        Dim sqlAdapter As SqlDataAdapter        Dim dt As New DataTable        Dim ds As New DataSet        '还是给cmd赋值            cmd.CommandText = cmdText        cmd.CommandType = cmdType        cmd.Connection = conn        cmd.Parameters.AddRange(paras)  '参数添加            sqlAdapter = New SqlDataAdapter(cmd)  '实例化adapter            Try            sqlAdapter.Fill(ds)           '用adapter将dataSet填充                 dt = ds.Tables(0)             'datatable为dataSet的第一个表                cmd.Parameters.Clear()        '清除参数            Catch ex As Exception            MsgBox(ex.Message, , "数据库操作")        Finally                            '最后一定要销毁cmd                Call CloseCmd(cmd)        End Try        Return dt    End Function    'Public Shared Function GetDataTable(ByVal cmdTxt As String, ByVal cmdType As CommandType, ByVal paras As SqlParameter()) As DataTable    '    Dim strConnStr As String = System.Configuration.ConfigurationManager.AppSettings("ConnStr")    '    定义一个数据库连接对象()    '    Dim conn As SqlConnection = New SqlConnection(strConnStr)    '    Dim cmd As New SqlCommand '定义一个命令对象      '    Dim adataset As DataSet    '    Dim adaptor As SqlDataAdapter '定义一个适配器对象      '    cmd = New SqlCommand(cmdTxt,    '    adaptor = New SqlDataAdapter(cmd)    '    adataset = New DataSet    '    cmd.CommandType = cmdType    '    cmd.Parameters.AddRange(paras)    '    Try    '        打开数据库连接()    '        If conn.State = ConnectionState.Closed Then    '            conn.Open()    '        End If    '        填充数据集()    '        adaptor.Fill(adataset)    '    Catch ex As Exception    '        MsgBox(ex.Message, , "数据库操作")    '    Finally    '        关闭数据库连接()    '        Call CloseConn(conn)    '        Call CloseCmd(cmd)    '    End Try    '    Return adataset.Tables(0)    'End Function    ''' <summary>        ''' 执行查询的操作,(无参)        ''' </summary>        ''' <param name="cmdText">需要执行语句,一般是Sql语句,也有存储过程</param>        ''' <param name="cmdType">判断Sql语句的类型,一般都不是存储过程</param>        ''' <returns>dataTable,查询到的表格</returns>        ''' <remarks></remarks>        Public Shared Function ExecSelectNo(ByVal cmdText As String, ByVal cmdType As CommandType) As DataTable        Dim sqlAdapter As SqlDataAdapter        Dim ds As New DataSet        '还是给cmd赋值            cmd.CommandText = cmdText        cmd.CommandType = cmdType        cmd.Connection = conn        sqlAdapter = New SqlDataAdapter(cmd)  '实例化adapter            Try            sqlAdapter.Fill(ds)           '用adapter将dataSet填充                 Return ds.Tables(0)             'datatable为dataSet的第一个表            Catch ex As Exception            Return Nothing        Finally                            '最后一定要销毁cmd                Call CloseCmd(cmd)        End Try    End Function    ''' <summary>        ''' 关闭连接        ''' </summary>        ''' <param name="conn">需要关闭的连接</param>        ''' <remarks></remarks>        Public Shared Sub CloseConn(ByVal conn As SqlConnection)        If (conn.State <> ConnectionState.Closed) Then  '如果没有关闭                conn.Close()                    '关闭连接                conn = Nothing                  '不指向原对象            End If    End Sub    ''' <summary>        ''' 关闭命令        ''' </summary>        ''' <param name="cmd">需要关闭的命令</param>        ''' <remarks></remarks>        Public Shared Sub CloseCmd(ByVal cmd As SqlCommand)        If Not IsNothing(cmd) Then          '如果cmd命令存在                cmd.Dispose()                   '销毁                cmd = Nothing        End If    End SubEnd Class
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