无效的 SQL语句；期待 'DELETE'、'INSERT'、'PROCEDURE'、'SELECT'、或 'UPDATE

Posted 2023-04-24

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我在做c#添加按钮单击事件
运行时跳出无效的 SQL语句；期待 'DELETE'、'INSERT'、'PROCEDURE'、'SELECT'、或 'UPDATE'我要郁闷死了…

private void button1_Click(object sender, EventArgs e)

try

conn1.Open();
int aa = 0;
com = new OleDbCommand("Selset*form bjb where 班级姓名='" + comboBox1.Text + "'", conn1);
read = com.ExecuteReader();
if (read.HasRows)

read.Read();
aa = read.GetInt32(0);

//string ss="insert into sxb values(SELECT xsb.姓名, xsb.年龄, bjb.班级名称, xsb.学号, xsb.性别 FROM bjb INNER JOIN xsb ON bjb.班级编号 = xsb.班级) WHERE (((xsb.姓名)='"+textBox1 .Text +"') AND ((xsb.年龄)='"+textBox2 .Text +"') AND ((bjb.班级名称)='"+aa+"') AND ((xsb.学号)="+textBox3 .Text +") AND ((xsb.性别)=yes))";

string ss = ("SELECT xsb.姓名, xsb.年龄, bjb.班级名称, xsb.学号, xsb.性别 FROM bjb INNER JOIN xsb ON bjb.班级编号 = xsb.班级 WHERE (((xsb.姓名)='" + textBox1.Text + "') AND ((xsb.年龄)=" + textBox2.Text + ") AND ((bjb.班级名称)=" + aa + ") AND ((xsb.学号)=" + textBox3.Text + ") AND ((xsb.性别)=yes))");
com = new OleDbCommand(ss, conn);
try

conn.Open ();
com.ExecuteNonQuery();
MessageBox.Show("添加成功！");

catch (Exception ex)

MessageBox.Show(ex.Message.ToString());

finally

conn.Close();



catch (Exception ex1)

MessageBox.Show(ex1.Message.ToString());

finally

conn.Close();

("Selset * form bjb where 班级姓名='" + comboBox1.Text + "'", conn1) 参考技术A Selset*form
-->
select * from

SQL——DELETE（删）

一、DELETE语句的基本用法

DELETE语句用于删除表中的记录。

DELETE语句语法：

DELETE FROM 表名 WHERE 条件语句;

 演示student表：

删除student表最后一行数据，例：

DELETE FROM student WHERE student_number = 20190207;

运行结果：

注意！！使用DELETE语句时，如果没有加WHERE字句时，将会删除整个表的数据，例：

DELETE FROM student;

运行结果：