• ASP.NET连接SQL、Access、Excel数据库(二)——连接实例


     源代码:13033480群共享

    ASP.NET使用ADO.NET连接数据库,ADO.NET的程序集名称是System.Data.dll,内有4个命名空间:System.Data.SqlClient、System.Data.OleDb、System.Data.Odbc和System.Data.OracleClient。每一个命名空间都包含ConnectionCommandDataReaderDataAdapter等类,我们就使用这些类建立与SQLAccessExcel数据库的连接。

    我们添加五个窗体文件,分别使用SQLServer.NET连接SQL数据库、使用OleDb.NET连接SQL数据库、使用OleDb.NET连接Excel数据库、使用OleDb.NET连接Access数据库、使用Odbc.NET连接Excel数据库。

    因为要使用ConfigurationManager读取Web.config文件中的连接字符串,所以,网站Web中要添加引用System.Configuration,并在aspx.cx文件中添加using System.Configuration

    一、SQLServerToSQLDatabase.aspx.cs

    连接字符串:

    <addname="SQLServerToSQLString"connectionString="Server=.\SQLEXPRESS;Database=NetShop;Trusted_Connection=yes;"providerName="System.Data.SqlClient"/>

    代码:

    using System;

    using System.Data;

     

    using System.Configuration;

     

    using System.Data.SqlClient;

     

    public partialclassSQLServerToSQLDatabase : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            String connectionString =ConfigurationManager.ConnectionStrings["SQLServerToSQLString"].ConnectionString;

     

            SqlConnection conn = new SqlConnection(connectionString);

     

            SqlCommand cmd = new SqlCommand();

            cmd.Connection = conn;

            cmd.CommandType = CommandType.Text;

            cmd.CommandText = "SELECT * FROM Category";

     

            conn.Open();

     

            SqlDataReader rdr = cmd.ExecuteReader();

            while (rdr.Read())

            {

                Response.Write(rdr["Name"] +"<br/>");

            }

     

            rdr.Close();

            conn.Close();

     

     

        }

    }

    二、OleDbToSQLDatabase.aspx.cs

    连接字符串:

    <addname="OleDbToSQLString"connectionString="Provider=SQLOLEDB;Server=.\SQLEXPRESS;Database=NetShop;Trusted_Connection=yes;"providerName="System.Data.OleDb"/>

    代码:

    using System;

    using System.Data;

     

    using System.Configuration;

     

    using System.Data.OleDb;

     

    public partialclassOleDbToSQLDatabase : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            String connectionString =ConfigurationManager.ConnectionStrings["OleDbToSQLString"].ConnectionString;

     

            OleDbConnection conn = new OleDbConnection(connectionString);

     

            OleDbCommand cmd = new OleDbCommand();

            cmd.Connection = conn;

            cmd.CommandType = CommandType.Text;

            cmd.CommandText = "SELECT * FROM Category";

     

            conn.Open();

     

            OleDbDataReader rdr = cmd.ExecuteReader();

            while (rdr.Read())

            {

                Response.Write(rdr["Name"] +"<br/>");

            }

     

            rdr.Close();

            conn.Close();

     

        }

    }

    三、OleDbToExcelDatabase.aspx.cs

    连接字符串:

    <addname="OleDbToExcelString"connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\NetShop.xls;extended properties=excel 8.0;"providerName="System.Data.OleDb"/>

    代码:

    using System;

    using System.Data;

     

    using System.Configuration;

     

    using System.Data.OleDb;

     

    public partialclassOleDbToExcelDatabase : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            String connectionString =ConfigurationManager.ConnectionStrings["OleDbToExcelString"].ConnectionString;

     

            OleDbConnection conn = new OleDbConnection(connectionString);

     

            OleDbCommand cmd = new OleDbCommand();

            cmd.Connection = conn;

            cmd.CommandType = CommandType.Text;

            cmd.CommandText = "SELECT * FROM Category";

     

            conn.Open();

     

            OleDbDataReader rdr = cmd.ExecuteReader();

            while (rdr.Read())

            {

                Response.Write(rdr["Name"] +"<br/>");

            }

     

            rdr.Close();

            conn.Close();

     

        }

    }

    四、OleDbToAccessDatabase.aspx.cs

    连接字符串:

    <addname="OleDbToAccessString"connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\NetShop.mdb"providerName="System.Data.OleDb"/>

    代码:

    using System;

    using System.Data;

     

    using System.Configuration;

     

    using System.Data.OleDb;

     

    public partialclassOleDbToAccessDatabase : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            String connectionString =ConfigurationManager.ConnectionStrings["OleDbToAccessString"].ConnectionString;

     

            OleDbConnection conn = new OleDbConnection(connectionString);

     

            OleDbCommand cmd = new OleDbCommand();

            cmd.Connection = conn;

            cmd.CommandType = CommandType.Text;

            cmd.CommandText = "SELECT * FROM Category";

     

            conn.Open();

     

            OleDbDataReader rdr = cmd.ExecuteReader();

            while (rdr.Read())

            {

                Response.Write(rdr["Name"] +"<br/>");

            }

     

            rdr.Close();

            conn.Close();

     

        }

    }

    五、OdbcToExcelDatabase.aspx.cs

    连接字符串:

    <addname="OdbcToExcelString"connectionString="Driver={Microsoft Excel Driver (*.xls)};DBQ=|DataDirectory|\NetShop.xls"providerName="System.Data.Odbc"/>

    代码:

    using System;

    using System.Data;

     

    using System.Configuration;

     

    using System.Data.Odbc;

     

    public partialclassOdbcToExcelDatabase : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            String connectionString =ConfigurationManager.ConnectionStrings["OdbcToExcelString"].ConnectionString;

     

            OdbcConnection conn = new OdbcConnection(connectionString);

     

            OdbcCommand cmd = new OdbcCommand();

            cmd.Connection = conn;

            cmd.CommandType = CommandType.Text;

            cmd.CommandText = "SELECT * FROM Category";

     

            conn.Open();

     

            OdbcDataReader rdr = cmd.ExecuteReader();

            while (rdr.Read())

            {

                Response.Write(rdr["Name"] +"<br/>");

            }

     

            rdr.Close();

            conn.Close();

     

        }

    }

    六、分别运行5个窗体文件,查看结果。

    注意:

    1、两个Data Source不有换成DatabaseDBQ也不能;

    2、使用OleDb连接SQL数据库,Trusted_Connection=yes只能是yes,不能是trueSSPI;

    3providerName="System.Data.SqlClient"providerName属性只起说明作用,可以不要。

    4、从五个程序的代码可以看出ADO.NET的一个主要优点,那就是:

    提供了对诸如 SQL Server XML 这样的数据源以及通过 OLE DB ODBC公开的数据源的一致访问

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  • 原文地址:https://www.cnblogs.com/java20130723/p/3211651.html
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