如何将多个表中的数据显示到dataGridView

Posted 2023-02-24

【中文标题】如何将多个表中的数据显示到dataGridView

【英文标题】：how to display data from multiple tables to dataGridView

【发布时间】：2014-03-06 00:32:39

【问题描述】：

我想在一个 dataGridView 中显示电话簿和电子邮件数据。问题是它只会显示电子邮件表

mysqlConnection connection = new MySqlConnection(MyConnectionString);
connection.Open();
try

    MySqlCommand cmd = connection.CreateCommand();
    cmd.CommandText = "SELECT * FROM phonebook";
    cmd.CommandText = "SELECT * FROM email";
    MySqlDataAdapter adap = new MySqlDataAdapter(cmd);
    DataSet ds = new DataSet();
    adap.Fill(ds);
    dataGridView1.DataSource = ds.Tables[0].DefaultView;

catch(Exception ex)

    MessageBox.Show(ex.Message);

finally

    if (connection.State == ConnectionState.Open)
    
        connection.Clone();
    

【问题讨论】：

你试过JOIN你的桌子吗？因为那样的话，你的cmd.CommandText = "SELECT * FROM phonebook"; 行就没用了。

【参考方案1】：

您需要连接两个表并获取如下结果

using(MySqlConnection connection = new MySqlConnection(MyConnectionString))
using(MySqlCommand cmd = connection.CreateCommand())

    connection.Open();
    cmd.CommandText = "SELECT pb.Id, pb.Name, pb.MobileNo, e.email FROM phonebook pb INNER JOIN email e ON e.Id= pb.Id";
    MySqlDataAdapter adap = new MySqlDataAdapter(cmd);
    DataSet ds = new DataSet();
    adap.Fill(ds);
    dataGridView1.DataSource = ds.Tables[0].DefaultView;