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  • ASP.NET(C#)连接数据库和操作数据库

    首先加入命名空间using System.Data;using System.Data.SqlClient;

    1.查询

    SqlConnection conn = new SqlConnection(); 
    
    conn = new SqlConnection(); 
    
    conn.ConnectionString = "Data Source=(local);Initial Catalog=数据库名;UserID=sa;Password=123456"; 
    
    conn.Open(); 
    
    string strsql=“select语句"; 
    
    SqlCommand cmd = new SqlCommand(strsql, conn); 
    
    SqlDataReader sqlreader = cmd.ExecuteReader(); 
    
    while (sqlreader.Read()) 
    
    {
    
           txtName.Text= sqlreader["列名"].ToString();
    
     } 
    
    sqlreader.Close();
    
     conn.Close();

    2.插入、更新、删除

     SqlConnection conn = new SqlConnection(); 
    
    conn = new SqlConnection(); 
    
    conn.ConnectionString = "Data Source=(local);Initial Catalog=数据库名;UserID=sa;Password=123456";
    
     conn.Open(); 
    
    strsql="update语句";
    
    // strsql="插入语句";
    
    //strsql="删除语句"; 
    
    SqlCommand sqlcmd2 = new SqlCommand(strsql, conn);
    
     int iResult = sqlcmd2.ExecuteNonQuery(); 
    
    conn.Close();
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  • 原文地址:https://www.cnblogs.com/caixiaofeng/p/3479476.html
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