知识大全 网购系统——通用数据库访问函数

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    一 try…catch…finally结构        [csharp]  using System;        using System Data;        using System Data SqlClient;        using System Configuration;        using System Collections Generic;        using WestGarden Model;        namespace WestGarden Web                public partial class Default : System Web UI Page                protected void Page_Load(object sender EventArgs e)                IList<CategoryInfo> catogories = new List<CategoryInfo>()         string connectionString = ConfigurationManager ConnectionStrings[ NetShopConnString ] ConnectionString;        string cmdText = SELECT * FROM Category ;        SqlCommand cmd = new SqlCommand()         SqlConnection conn = new SqlConnection(connectionString)         try                cmd Connection = conn;        cmd CommandType = CommandType Text;        cmd CommandText = cmdText;        conn Open()         SqlDataReader rdr = cmd ExecuteReader()         while (rdr Read())                CategoryInfo category = new CategoryInfo(rdr GetString( ) rdr GetString( ) rdr GetString( ))         catogories Add(category)                 rdr Close()                 finally                conn Close()                 ddlCategories DataSource = catogories;        ddlCategories DataTextField = Name ;        ddlCategories DataValueField = CategoryId ;        ddlCategories DataBind()                                 using System;        using System Data;        using System Data SqlClient;        using System Configuration;        using System Collections Generic;        using WestGarden Model;        namespace WestGarden Web                public partial class Default : System Web UI Page                protected void Page_Load(object sender EventArgs e)                IList<CategoryInfo> catogories = new List<CategoryInfo>()         string connectionString = ConfigurationManager ConnectionStrings[ NetShopConnString ] ConnectionString;        string cmdText = SELECT * FROM Category ;        SqlCommand cmd = new SqlCommand()         SqlConnection conn = new SqlConnection(connectionString)         try                cmd Connection = conn;        cmd CommandType = CommandType Text;        cmd CommandText = cmdText;        conn Open()         SqlDataReader rdr = cmd ExecuteReader()         while (rdr Read())                CategoryInfo category = new CategoryInfo(rdr GetString( ) rdr GetString( ) rdr GetString( ))         catogories Add(category)                 rdr Close()                 finally                conn Close()                 ddlCategories DataSource = catogories;        ddlCategories DataTextField = Name ;        ddlCategories DataValueField = CategoryId ;        ddlCategories DataBind()                                 二 using()结构        [csharp] using System;        using System Data;        using System Data SqlClient;        using System Configuration;        using System Collections Generic;        using WestGarden Model;        namespace WestGarden Web                public partial class Default : System Web UI Page                protected void Page_Load(object sender EventArgs e)                IList<CategoryInfo> catogories = new List<CategoryInfo>()         string connectionString = ConfigurationManager ConnectionStrings[ NetShopConnString ] ConnectionString;        string cmdText = SELECT * FROM Category ;        SqlCommand cmd = new SqlCommand() [nextpage]        //简单地说 using()结构等同于前面的try…finally结构 隐式关闭了conn         using(SqlConnection conn = new SqlConnection(connectionString))                cmd Connection = conn;        cmd CommandType = CommandType Text;        cmd CommandText = cmdText;        conn Open()         SqlDataReader rdr = cmd ExecuteReader()         while (rdr Read())                CategoryInfo category = new CategoryInfo(rdr GetString( ) rdr GetString( ) rdr GetString( ))         catogories Add(category)                 rdr Close()                 ddlCategories DataSource = catogories;        ddlCategories DataTextField = Name ;        ddlCategories DataValueField = CategoryId ;        ddlCategories DataBind()                                 using System;        using System Data;        using System Data SqlClient;        using System Configuration;        using System Collections Generic;        using WestGarden Model;        namespace WestGarden Web                public partial class Default : System Web UI Page                protected void Page_Load(object sender EventArgs e)                IList<CategoryInfo> catogories = new List<CategoryInfo>()         string connectionString = ConfigurationManager ConnectionStrings[ NetShopConnString ] ConnectionString;        string cmdText = SELECT * FROM Category ;        SqlCommand cmd = new SqlCommand()         //简单地说 using()结构等同于前面的try…finally结构 隐式关闭了conn         using(SqlConnection conn = new SqlConnection(connectionString))                cmd Connection = conn;        cmd CommandType = CommandType Text;        cmd CommandText = cmdText;        conn Open()         SqlDataReader rdr = cmd ExecuteReader()         while (rdr Read())                CategoryInfo category = new CategoryInfo(rdr GetString( ) rdr GetString( ) rdr GetString( ))         catogories Add(category)                 rdr Close()                 ddlCategories DataSource = catogories;        ddlCategories DataTextField = Name ;        ddlCategories DataValueField = CategoryId ;        ddlCategories DataBind()                                 三 通用的数据库访问函数        [csharp] using System;        using System Data;        using System Data SqlClient;        using System Configuration;        using System Collections Generic;        using WestGarden Model;        namespace WestGarden Web                public partial class Default : System Web UI Page                protected void Page_Load(object sender EventArgs e)                IList<CategoryInfo> catogories = new List<CategoryInfo>()         string connectionString = ConfigurationManager ConnectionStrings[ NetShopConnString ] ConnectionString;        string cmdText = SELECT * FROM Category ;        SqlDataReader rdr = ExecuteReader(connectionString CommandType Text cmdText)         while (rdr Read())                CategoryInfo category = new CategoryInfo(rdr GetString( ) rdr GetString( ) rdr GetString( ))         catogories Add(category)                 rdr Close()         ddlCategories DataSource = catogories;        ddlCategories DataTextField = Name ;        ddlCategories DataValueField = CategoryId ;        ddlCategories DataBind()                 public static SqlDataReader ExecuteReader(string connectionString CommandType cmdType string cmdText)                SqlCommand cmd = new SqlCommand()         SqlConnection conn = new SqlConnection(connectionString)         try                cmd Connection = conn;        cmd CommandType = cmdType;        cmd CommandText = cmdText;        conn Open()     [nextpage]    //如果创建了 SqlDataReader 并将 CommandBehavior 设置为 CloseConnection         //则关闭 SqlDataReader 会自动关闭此连接        SqlDataReader rdr = cmd ExecuteReader(CommandBehavior CloseConnection)         return rdr;                catch                conn Close()         throw;                //finally        //        //    conn Close()         //                                using System;        using System Data;        using System Data SqlClient;        using System Configuration;        using System Collections Generic;        using WestGarden Model;        namespace WestGarden Web                public partial class Default : System Web UI Page                protected void Page_Load(object sender EventArgs e)                IList<CategoryInfo> catogories = new List<CategoryInfo>()         string connectionString = ConfigurationManager ConnectionStrings[ NetShopConnString ] ConnectionString;        string cmdText = SELECT * FROM Category ;        SqlDataReader rdr = ExecuteReader(connectionString CommandType Text cmdText)         while (rdr Read())                CategoryInfo category = new CategoryInfo(rdr GetString( ) rdr GetString( ) rdr GetString( ))         catogories Add(category)                 rdr Close()         ddlCategories DataSource = catogories;        ddlCategories DataTextField = Name ;        ddlCategories DataValueField = CategoryId ;        ddlCategories DataBind()                 public static SqlDataReader ExecuteReader(string connectionString CommandType cmdType string cmdText)                SqlCommand cmd = new SqlCommand()         SqlConnection conn = new SqlConnection(connectionString)         try                cmd Connection = conn;        cmd CommandType = cmdType;        cmd CommandText = cmdText;        conn Open()         //如果创建了 SqlDataReader 并将 CommandBehavior 设置为 CloseConnection         //则关闭 SqlDataReader 会自动关闭此连接        SqlDataReader rdr = cmd ExecuteReader(CommandBehavior CloseConnection)         return rdr;                catch                conn Close()         throw;                //finally        //        //    conn Close()         //                            [nextpage]    四 完善一下通用数据库访问函数        [csharp] using System;        using System Data;        using System Data SqlClient;        using System Configuration;        using System Collections Generic;        using WestGarden Model;        namespace WestGarden Web                public partial class Default : System Web UI Page                protected void Page_Load(object sender EventArgs e)                IList<CategoryInfo> catogories = new List<CategoryInfo>()         string connectionString = ConfigurationManager ConnectionStrings[ NetShopConnString ] ConnectionString;        string cmdText = SELECT * FROM Category ;        SqlDataReader rdr = ExecuteReader(connectionString CommandType Text cmdText null)         while (rdr Read())                CategoryInfo category = new CategoryInfo(rdr GetString( ) rdr GetString( ) rdr GetString( ))         catogories Add(category)                 rdr Close()         ddlCategories DataSource = catogories;        ddlCategories DataTextField = Name ;        ddlCategories DataValueField = CategoryId ;        ddlCategories DataBind()                 public static SqlDataReader ExecuteReader(string connectionString CommandType cmdType string cmdText params SqlParameter[] mandParameters)                SqlCommand cmd = new SqlCommand()         SqlConnection conn = new SqlConnection(connectionString)         try                //cmd Connection = conn;        //cmd CommandType = cmdType;        //cmd CommandText = cmdText;        //conn Open()         PrepareCommand(cmd conn null cmdType cmdText mandParameters)         //如果创建了 SqlDataReader 并将 CommandBehavior 设置为 CloseConnection         //则关闭 SqlDataReader 会自动关闭此连接         SqlDataReader rdr = cmd ExecuteReader(CommandBehavior CloseConnection)         cmd Parameters Clear()         return rdr;                catch                conn Close()         throw;                //finally        //        //    conn Close()         //                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)                                         using System;        using System Data;        using System Data SqlClient;        using System Configuration;        using System Collections Generic;        using WestGarden Model;        namespace WestGarden Web                public partial class Default : System Web UI Page                protected void Page_Load(object sender EventArgs e)            [nextpage]    IList<CategoryInfo> catogories = new List<CategoryInfo>()         string connectionString = ConfigurationManager ConnectionStrings[ NetShopConnString ] ConnectionString;        string cmdText = SELECT * FROM Category ;        SqlDataReader rdr = ExecuteReader(connectionString CommandType Text cmdText null)         while (rdr Read())                CategoryInfo category = new CategoryInfo(rdr GetString( ) rdr GetString( ) rdr GetString( ))         catogories Add(category)                 rdr Close()         ddlCategories DataSource = catogories;        ddlCategories DataTextField = Name ;        ddlCategories DataValueField = CategoryId ;        ddlCategories DataBind()                 public static SqlDataReader ExecuteReader(string connectionString CommandType cmdType string cmdText params SqlParameter[] mandParameters)                SqlCommand cmd = new SqlCommand()         SqlConnection conn = new SqlConnection(connectionString)         try                //cmd Connection = conn;        //cmd CommandType = cmdType;        //cmd CommandText = cmdText;        //conn Open()         PrepareCommand(cmd conn null cmdType cmdText mandParameters)         //如果创建了 SqlDataReader 并将 CommandBehavior 设置为 CloseConnection         //则关闭 SqlDataReader 会自动关闭此连接         SqlDataReader rdr = cmd ExecuteReader(CommandBehavior CloseConnection)         cmd Parameters Clear()         return rdr;                catch                conn Close()         throw;                //finally        //        //    conn Close()         //                private static void PrepareCommand(SqlCommand cmd SqlConnection conn SqlTransaction trans CommandType cmdType string cmdText SqlParameter[] cmdParms)            [nextpage]    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)                                         五 使用Reapter显示分类名称        窗体代码         [] <asp:Repeater ID= repCategories runat= server >        <HeaderTemplate>        <table cellspacing= border= >        </HeaderTemplate>        <ItemTemplate>        <tr>        <td>        <asp:HyperLink runat= server ID= lnkCategory NavigateUrl= <%# string Format( ~/Items aspx?page= &categoryId= Eval( CategoryId )) %>         Text= <%# Eval( Name ) %> /><asp:HiddenField runat= server ID= hidCategoryId Value= <%# Eval( CategoryId ) %> />        </td>        </tr>        </ItemTemplate>        <FooterTemplate>        </table>        </FooterTemplate>        </asp:Repeater>        <asp:Repeater ID= repCategories runat= server >        <HeaderTemplate>        <table cellspacing= border= >        </HeaderTemplate>        <ItemTemplate>        <tr>        <td>        <asp:HyperLink runat= server ID= lnkCategory NavigateUrl= <%# string Format( ~/Items aspx?page= &categoryId= Eval( CategoryId )) %>         Text= <%# Eval( Name ) %> /><asp:HiddenField runat= server ID= hidCategoryId Value= <%# Eval( CategoryId ) %> />        </td>        </tr>        </ItemTemplate>        <FooterTemplate>        </table>        </FooterTemplate>        </asp:Repeater>        代码页绑定代码         [csharp] repCategories DataSource = catogories;        repCategories DataBind() cha138/Article/program/net/201311/13382

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