//管理员输入审核用户名时验证该用户是否存在，并提示
private void textBox2_KeyUp(object sender, KeyEventArgs e)
{
DBlink db = new DBlink();
if (db.DBconn())
{
string str = "select * from login_info where username='******'";
if (db.search(str))
{
label5.Text = "*删除用户！" + textBox2.Text + "?请点击删除按钮";
button2.Enabled = true;
}
else
{
label5.Text = "*用户不存在！";
button2.Enabled = false;
}
}
}
//管理员输入审核用户名时验证该用户是否存在，并提示
private void textBox1_KeyUp(object sender, KeyEventArgs e)
{
DBlink db = new DBlink();
if (db.DBconn())
{
string str = "select * from login_info where tag=0 and username='******'";
if (db.search(str))
{
label3.Text = "*该用户未审核！";
button1.Enabled = true;
}
else
{
label3.Text = "*用户不存在！";
button1.Enabled = false;
}
}
}
//教师输入要查询的学号时验证该学号的成绩信息是否已经存在
private void StuNum_in_KeyUp(object sender, KeyEventArgs e)
{
dataGridView1.Rows.Clear(); //初始化dataGridView
DBlink db = new DBlink();
Boolean tag = false; //辅助标记，先查询该学号是否存在，若存在再进行数据查询的操作
string str = "select * from login_info where number='" + StuNum_in.Text + "'";
if (db.DBconn()) //连接数据库成功
{
if (db.search(str))
{
Search_TS.Text = "查询到" + StuNum_in.Text + "同学的成绩信息如上！";
tag = true;
}
else
{
Search_TS.Text = "该用户不存在";
}
}
db.DBclose(); //避免多线程操作数据库，影响系统报错，先关闭数据连接
if (tag) //输入的学号在用户名中存在
{
if (db.DBconn())
{
db.GetScoreData("select * from student_score where number='" + StuNum_in.Text + "'"); //执行sql
for (int i = 0; i < ScoreInfo.id.Count; i++) //循环将数据实体类的数据存放到dataGridView中
{
int index = this.dataGridView1.Rows.Add();
this.dataGridView1.Rows[index].Cells[0].Value = ScoreInfo.id[i]; //填充编号
this.dataGridView1.Rows[index].Cells[1].Value = ScoreInfo.number[i]; //填充学号
this.dataGridView1.Rows[index].Cells[2].Value = ScoreInfo.xueqi[i]; //填充课程归属
this.dataGridView1.Rows[index].Cells[3].Value = ScoreInfo.kecheng[i]; //填充课程名
this.dataGridView1.Rows[index].Cells[4].Value = ScoreInfo.chengji[i]; //填充成绩
this.dataGridView1.Rows[index].Cells[5].Value = ScoreInfo.name[i]; //填充姓名
}
}
db.DBclose();
}
}