使用c#表单应用程序更新Access db

我已经编写了一个代码来完成上述任务。没有错误，但访问数据库未更新

 private void button1_Click(object sender, EventArgs e)
    {
        OleDbConnection mycon = new OleDbConnection();
        mycon.ConnectionString =@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Dinesh\C#\GIS_Power\WindowsFormsApplication1\bin\Power_DB1";
        OleDbCommand command = new OleDbCommand();
        command.CommandText = "INSERT INTO Table1 (Emp_ID,Asset_ID)VALUES('" + textBox1.Text + "','" + textBox2.Text + "')";
    }

---

问题1:您需要使用

ExecuteNonQuery（）

方法执行命令

问题2:您没有通过从连接对象调用

open（）

方法打开与数据库的连接

问题3:您没有将

连接

对象分配给

命令

对象

建议：您的

惰性INTO

语句容易受到

SQL注入攻击

，因此我建议您使用

参数化查询

来避免这些攻击

完整代码：

OleDbConnection mycon = new OleDbConnection();
mycon.ConnectionString =@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Dinesh\C#\GIS_Power\WindowsFormsApplication1\bin\Power_DB1";
OleDbCommand command = new OleDbCommand();

command.CommandText = "INSERT INTO Table1 (Emp_ID,Asset_ID) VALUES(@empID,@assetID)";
command.Parameters.AddWithValue("@empID",textBox1.Text);
command.Parameters.AddWithValue("@assetID",textBox2.Text);
mycon.Open();
command.Connection=mycon;
command.ExecuteNonQuery();

OleDbConnection mycon = new OleDbConnection();
mycon.ConnectionString =@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Dinesh\C#\GIS_Power\WindowsFormsApplication1\bin\Power_DB1";
mycon.Open(); //opening connection

OleDbCommand command = new OleDbCommand();
command.CommandText = "INSERT INTO Table1 (Emp_ID,Asset_ID)VALUES('" + textBox1.Text + "','" + textBox2.Text + "')";
command.ExecuteNonQuery();    //executing query

mycon.Close();    //close the connection after executing the query

---

您没有执行该命令。请执行insert语句，然后只有它将数据插入数据库

这会解决你的问题

OleDbCommand command = new OleDbCommand("//Isert statment here", mycon);
command.ExecuteNonQuery();

---

您创建了连接字符串，但未打开连接

您创建了查询，但没有执行它

解决方案：

OleDbConnection mycon = new OleDbConnection();
mycon.ConnectionString =@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Dinesh\C#\GIS_Power\WindowsFormsApplication1\bin\Power_DB1";
OleDbCommand command = new OleDbCommand();

command.CommandText = "INSERT INTO Table1 (Emp_ID,Asset_ID) VALUES(@empID,@assetID)";
command.Parameters.AddWithValue("@empID",textBox1.Text);
command.Parameters.AddWithValue("@assetID",textBox2.Text);
mycon.Open();
command.Connection=mycon;
command.ExecuteNonQuery();

OleDbConnection mycon = new OleDbConnection();
mycon.ConnectionString =@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Dinesh\C#\GIS_Power\WindowsFormsApplication1\bin\Power_DB1";
mycon.Open(); //opening connection

OleDbCommand command = new OleDbCommand();
command.CommandText = "INSERT INTO Table1 (Emp_ID,Asset_ID)VALUES('" + textBox1.Text + "','" + textBox2.Text + "')";
command.ExecuteNonQuery();    //executing query

mycon.Close();    //close the connection after executing the query

您需要

打开
连接
并
执行
查询

代码：

OleDbConnection mycon = new OleDbConnection();
mycon.ConnectionString =@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Dinesh\C#\GIS_Power\WindowsFormsApplication1\bin\Power_DB1";
OleDbCommand command = new OleDbCommand();

command.CommandText = "INSERT INTO Table1 (Emp_ID,Asset_ID) VALUES(@empID,@assetID)";
command.Parameters.AddWithValue("@empID",textBox1.Text);
command.Parameters.AddWithValue("@assetID",textBox2.Text);
mycon.Open();
command.Connection=mycon;
command.ExecuteNonQuery();

OleDbConnection mycon = new OleDbConnection();
mycon.ConnectionString =@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Dinesh\C#\GIS_Power\WindowsFormsApplication1\bin\Power_DB1";
mycon.Open(); //opening connection

OleDbCommand command = new OleDbCommand();
command.CommandText = "INSERT INTO Table1 (Emp_ID,Asset_ID)VALUES('" + textBox1.Text + "','" + textBox2.Text + "')";
command.ExecuteNonQuery();    //executing query

mycon.Close();    //close the connection after executing the query

使用

建议：使用<代码>使用<代码>进行连接和（可能？）命令。在这种情况下，费率将非常感谢：）