Question

以下是我写的代码，所以请检查并告诉我有什么问题。我在这里发布了插入和更新代码。

我从youtube上学到了这一点，所以我不知道有关数据库的每一个细节，所以请用一个像我这样的业余爱好者的语言发帖

 public void bsave_Click(object sender, RoutedEventArgs e)
 {
        SQLiteConnection sqliyeCon = new SQLiteConnection(dbConnectionString);
        //open connection to database
        try
        {
            sqliyeCon.Open();
            string Query = "insert into employeeinfo (name,surname,age) values('" + this.name.Text + "', '" + this.surname.Text + "' , '" + this.age.Text + "')";
            SQLiteCommand createCommand = new SQLiteCommand(Query, sqliyeCon);
            createCommand.ExecuteNonQuery();
            MessageBox.Show("Data is saved succesfully");
            sqliyeCon.Close();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
 }

 private void bup_Click(object sender, RoutedEventArgs e)
 {
        SQLiteConnection sqliyeCon = new SQLiteConnection(dbConnectionString);
        //open connection to database
        try
        {
            sqliyeCon.Open();
            string Query = "update employeeinfo set eid='" + this.eid.Text + "' , name ='" + this.name.Text + "',surname='" + this.surname.Text + "', age='" + this.age.Text + "' where eid=eid='" + this.eid.Text + "' ";
            SQLiteCommand createCommand = new SQLiteCommand(Query, sqliyeCon);
            createCommand.ExecuteNonQuery();
            MessageBox.Show("Updated");
            sqliyeCon.Close();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }
}

Answer 1

"' where eid=eid='"应为"' where eid='"

string Query = "update employeeinfo set eid='" + this.eid.Text + "' , name ='" + this.name.Text + "',surname='" + this.surname.Text + "', age='" + this.age.Text + "' where eid='" + this.eid.Text + "' ";

c＃，使用visual studio 2012，能够保存到数据库但无法更新

1 个答案: