C# 在把變數嵌入SQL中

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1、使用 ‘ " +    + " ‘ 拼接

string mysql =     "SELECT Cname,Grade       FROM student,score,course       WHERE student.Sno = score.Sno and                   score.Cno = course.Cno and                   student.Sno = ‘" + Convert.ToString(textBox1.Text) + "’ and                           score.Text =‘" + Convert.ToInt32(comboBox1.Text) + “’;    ”; 

2、使用預留位置

string mysql = string.Format(    "SELECT Cname,Grade      FROM student,score,course      WHERE student.Sno = score.Sno and                 score.Cno = course.Cno and                 student.Sno = ‘{0}‘ and                 score.Text = ‘{1}‘ " ,    textbox1.Text,ComboBox1.Text);    

 

C# 在把變數嵌入SQL中

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