Question

这是我用于添加数据库表的代码。它工作但我想在comboBox中显示添加的表名。例如：如果我在数据库中添加schoolName1，如何在schoolName1中显示comboBox？感谢。

private void button1_Click(object sender, EventArgs e)
{

    string myConnectionString= @"DataSource =.\SQLEXPRESS;AttachDbFileName=myconnection.mdf;Integrated Security=true;"

    SqlConnection dbConnection = new SqlConnection(myConnectionString);

    string myCommand = "CREATE TABLE["+textBox1.Text+"] (column1 VARCHAR(10),colunm2 INT)";

    SqlCommand dbConnection = new SqlCommand(myCommand,dbConnection);

    try
       {
          dbConnection.Open();
          dbCommand.ExecuteNonQuery();
       }

    catch{}

          dbConnection.Close();
 }

Answer 1

检索所有数据库表您需要从information_schema.tables进行查询并将结果绑定到所需的combox

    String strConnection = "Data Source=HP\\SQLEXPRESS;database=your_db;Integrated Security=true";

    SqlConnection con = new SqlConnection(strConnection);
    try
    {

        con.Open();

        SqlCommand sqlCmd = new SqlCommand();

        sqlCmd.Connection = con;
        sqlCmd.CommandType = CommandType.Text;
        sqlCmd.CommandText = "Select table_name from information_schema.tables";

        SqlDataAdapter sqlDataAdap = new SqlDataAdapter(sqlCmd);

        DataTable dtRecord = new DataTable();
        sqlDataAdap.Fill(dtRecord);
        comboBox1.DataSource = dtRecord;
        comboBox1.DisplayMember = "TABLE_NAME";
        con.Close();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }

这是我的方式您可以使用多种方法来检索此信息并在组合框中显示参考：link

我已编辑并完成您的代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public string myConnectionString = @"DataSource =.\SQLEXPRESS;AttachDbFileName=myconnection.mdf;Integrated Security=true;"

        private void Form1_Load(object sender, EventArgs e)
        {
            FillCombo();
        }

        private void FillCombo()
        {
            SqlConnection dbConnection = new SqlConnection(myConnectionString);
            SqlCommand sqlCmd = new SqlCommand();
            try
            {

                sqlCmd.Connection = dbConnection;
                sqlCmd.CommandType = CommandType.Text;
                sqlCmd.CommandText = "use database_name; SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = 'BASE TABLE';";
                SqlDataAdapter sqlDataAdap = new SqlDataAdapter(sqlCmd);
                DataTable dtRecord = new DataTable();
                sqlDataAdap.Fill(dtRecord);
                comboBox1.DataSource = dtRecord;
                comboBox1.DisplayMember = "TABLE_NAME";
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            dbConnection.Close();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            SqlConnection dbConnection = new SqlConnection(myConnectionString);
            string myCommand = "CREATE TABLE["+textBox1.Text+"] (column1 VARCHAR(10),colunm2 INT)";
            SqlCommand dbCommand = new SqlCommand(myCommand, dbConnection);
            try
               {
                  dbConnection.Open();
                  dbCommand.ExecuteNonQuery();
                  FillCombo();
               }

            catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            dbConnection.Close();
         }
        }
}

如何使用Windows窗体应用程序检索ComboBox中的数据库表？

1 个答案: