使用Connector / NET Programming创建数据库？

如何使用连接器/网络编程创建数据库？ 为什么以下不起作用？

string connStr = "server=localhost;user=root;port=3306;password=mysql;"; MySqlConnection conn = new MySqlConnection(connStr); MySqlCommand cmd; string s0; try { conn.Open(); s0 = "CREATE DATABASE IF NOT EXISTS `hello`;"; cmd = new MySqlCommand(s0, conn); conn.Close(); } catch (Exception e) { Console.WriteLine(e.ToString()); } 

Answer 1

您可能想要执行MySqlCommand。 现在您只需创建一个，但它不会执行您的查询。

试试这个：

 conn.Open(); s0 = "CREATE DATABASE IF NOT EXISTS `hello`;"; cmd = new MySqlCommand(s0, conn); cmd.ExecuteNonQuery(); conn.Close(); 

Answer 2

您需要执行命令并确保正确处置对象：

 string connStr = "server=localhost;user=root;port=3306;password=mysql;"; using (var conn = new MySqlConnection(connStr)) using (var cmd = conn.CreateCommand()) { conn.Open(); cmd.CommandText = "CREATE DATABASE IF NOT EXISTS `hello`;"; cmd.ExecuteNonQuery(); } 

Answer 3

执行您的命令并尝试此function

 public void createDatabase(string server, string port, string database, string username, string password) { string connectionstring = string.Format("Server = {0}; Port ={1}; Uid = {2}; Pwd = {3}; pooling = true; Allow Zero Datetime = False; Min Pool Size = 0; Max Pool Size = 200; ", server, port, username, password); using (var con = new MySqlConnection { ConnectionString = connectionstring }) { using (var command = new MySqlCommand { Connection = con }) { if (con.State == ConnectionState.Open) con.Close(); try { con.Open(); } catch (MySqlException ex) { msgErr(ex.Message + " connection error."); return; } try { command.CommandText = @"CREATE DATABASE IF NOT EXISTS @database"; command.Parameters.AddWithValue("@database", database); command.ExecuteNonQuery();//Execute your command } catch (MySqlException ex) { msgErr(ex.Message + " sql query error."); return; } } } } 

Answer 4

Imports MySql.Data.MySqlClient Public Class Form1 Private dBf As String =“Empresa”Private str As String =“Server = localhost; uid = root; pwd =; Database = mysql; pooling = false;” Private Cmd As MySqlCommand Private Con As New MySqlConnection（str）Private Sub Form1_Load（）Handles MyBase.Load Try Con.Open（）Cmd = New MySqlCommand（“Create database If If exists”+ dBf，Con）Cmd.ExecuteNonQuery（）： Con.ChangeDatabase（dBf）Cmd = Con.CreateCommand Cmd.CommandText =“CREATE TABLE Empleado”＆“（Id Char（10）COLLATE utf8_spanish_ci Not Null，”＆“name VarChar（50）COLLATE utf8_spanish_ci Not Null，”＆“email VarChar（50）COLLATE utf8_spanish_ci Not Null，“＆”网站VarChar（50）COLLATE utf8_spanish_ci Not Null，“＆”Primary Key（id））ENGINE = MyISAM“Cmd.ExecuteNonQuery（）MsgBox（”Registros，ok !!!“ ）：Con.Close（）Catch ex As Exception MsgBox（Err.Description）结束尝试结束子结束类