Question

有2个带有不同表命令的sql命令。这是我的代码。

  private void button1_Click(object sender, EventArgs e)
    {
        string txtbx9 = textBox9.Text.ToString();
        string cmbbx2 = comboBox2.SelectedItem.ToString();
        string name = textBox1.Text.ToString();
        string surname = textBox2.Text.ToString();
        string company = textBox3.Text.ToString();
        string txtbx8 = textBox8.Text.ToString();
        string sts = "In House";

            try
            {
                connection.Open();


                MessageBox.Show("Payment approved.");
                richTextBox1.Text = richTextBox1.Text + "The hotel received " + txtbx9 + " from this guest";
                 string rtb = richTextBox1.Text.ToString();

            OleDbCommand command = new OleDbCommand();
                command.Connection = connection;
                command.CommandText = "INSERT INTO billing(g_name,g_surname,g_company,g_totalrate, g_paid, g_typepaid, info, u_add, u_tadd, g_ad, g_dd, g_amountofdays) VALUES('" + name + "','" + surname + "','" + company + "','" + txtbx8 + "', '" + txtbx9 + "', '" + cmbbx2 + "', '" + rtb + "', '" + label12.Text.ToString() + "', '" + this.dateTimePicker1.Value +"','"+textBox4.Text.ToString()+"','"+textBox5.Text.ToString()+"','"+textBox6.Text.ToString()+"')"; ;
                command.ExecuteNonQuery();
                command.CommandType = CommandType.Text;
                command.CommandText = "UPDATE guestreg SET g_paidstatus='Paid '"+txtbx9+"'' where g_name ='"+name+"' and g_status = '"+sts"'";

                command.Connection = connection;
                connection.Open();
                command.ExecuteNonQuery();

        }

我如何一起完成这2个命令？该程序执行第一个sql命令，但不执行第二个命令

Answer 1

您可以在命令中执行两个表扬：

try
{
      connection.Open();   

      MessageBox.Show("Payment approved.");
      richTextBox1.Text = richTextBox1.Text + "The hotel received " + txtbx9 + " from this guest";
      string rtb = richTextBox1.Text.ToString();
      command.Connection = connection;
      command.CommandText = "INSERT INTO billing(g_name,g_surname,g_company,g_totalrate, g_paid, g_typepaid, info, u_add, u_tadd, g_ad, g_dd, g_amountofdays) VALUES('" + name + "','" + surname + "','" + company + "','" + txtbx8 + "', '" + txtbx9 + "', '" + cmbbx2 + "', '" + rtb + "', '" + label12.Text.ToString() + "', '" + this.dateTimePicker1.Value +"','"+textBox4.Text.ToString()+"','"+textBox5.Text.ToString()+"','"+textBox6.Text.ToString()+"')";
      command.CommandText += "\nUPDATE guestreg SET g_paidstatus='Paid '"+txtbx9+"'' where g_name ='"+name+"' and g_status = '"+sts"'";
      command.ExecuteNonQuery();
}

或者只是一个接一个地执行它们：

try
{
      connection.Open();   

      MessageBox.Show("Payment approved.");
      richTextBox1.Text = richTextBox1.Text + "The hotel received " + txtbx9 + " from this guest";
      string rtb = richTextBox1.Text.ToString();
      command.Connection = connection;
      command.CommandText = "INSERT INTO billing(g_name,g_surname,g_company,g_totalrate, g_paid, g_typepaid, info, u_add, u_tadd, g_ad, g_dd, g_amountofdays) VALUES('" + name + "','" + surname + "','" + company + "','" + txtbx8 + "', '" + txtbx9 + "', '" + cmbbx2 + "', '" + rtb + "', '" + label12.Text.ToString() + "', '" + this.dateTimePicker1.Value +"','"+textBox4.Text.ToString()+"','"+textBox5.Text.ToString()+"','"+textBox6.Text.ToString()+"')";
      command.ExecuteNonQuery();
      command.CommandText = "UPDATE guestreg SET g_paidstatus='Paid '"+txtbx9+"'' where g_name ='"+name+"' and g_status = '"+sts"'";
      command.ExecuteNonQuery();
}

修改：

正如史蒂夫所说（他绝对正确），参数应该作为SqlParameters传递。这样做的好处是可以更好地防止SQL注入，你可以肯定的是，意外的输入如“O＆＃39; Neil＆＃39;不要破坏你的代码（参数名称可能更好）：

try { connection.Open(); MessageBox.Show("Payment approved."); richTextBox1.Text = richTextBox1.Text + "The hotel received " + txtbx9 + " from this guest"; string rtb = richTextBox1.Text.ToString(); command.Connection = connection; command.CommandText = "INSERT INTO billing(g_name,g_surname,g_company,g_totalrate, g_paid, g_typepaid, info, u_add, u_tadd, g_ad, g_dd, g_amountofdays) VALUES(@name,@surname,@company,@txtbx8,@txtbx9,@cmbbx2,@rtb,@label12Text,@dateTimePicker1Value,@textBox4Text,@textBox5Text,@textBox6Text')"; command.Parameters.Add(new SqlParameter("@name",name)); command.Parameters.Add(new SqlParameter("@surname",surname)); command.Parameters.Add(new SqlParameter("@company",company)); command.Parameters.Add(new SqlParameter("@txtbx8",txtbx8)); command.Parameters.Add(new SqlParameter("@txtbx9",txtbx9)); command.Parameters.Add(new SqlParameter("@cmbbx2",cmbbx2)); command.Parameters.Add(new SqlParameter("@rtb",rtb)); command.Parameters.Add(new SqlParameter("@label12Text",label12.Text.ToString())); command.Parameters.Add(new SqlParameter("@dateTimePicker1Value",this.dateTimePicker1.Value.ToString())); command.Parameters.Add(new SqlParameter("@textBox4Text",textBox4.Text.ToString())); command.Parameters.Add(new SqlParameter("@textBox5Text",textBox5.Text.ToString())); command.Parameters.Add(new SqlParameter("@textBox6Text",textBox6.Text.ToString())); command.ExecuteNonQuery(); command.CommandText = "UPDATE guestreg SET g_paidstatus=@paidStatus where g_name =@name and g_status = @status"; command.Parameters.Add(new SqlParameter("@paidStatus","Paid " + txtbx9)); command.Parameters.Add(new SqlParameter("@name",name)); command.Parameters.Add(new SqlParameter("@status",sts)); command.ExecuteNonQuery(); }

Answer 2

有很多方法可以做到这一点，但对我来说最简单的方法是关闭并重新做这样：

SqlCommand importCommand = new SqlCommand("select * from * ", connection);
        SqlDataReader sqlDR = importCommand.ExecuteReader();
        int index = 0;
        while (sqlDR.Read()) { //something }
        sqlDR.Close();

        index = 0;
        importCommand = new SqlCommand("select * from * ", connection);
        sqlDR = importCommand.ExecuteReader();
        sqlDR.Close();

Answer 3

你可以用它。你必须两次创建命令。

private void button1_Click(object sender, EventArgs e)
{
string txtbx9 = textBox9.Text.ToString();
string cmbbx2 = comboBox2.SelectedItem.ToString();
string name = textBox1.Text.ToString();
string surname = textBox2.Text.ToString();
string company = textBox3.Text.ToString();
string txtbx8 = textBox8.Text.ToString();
string sts = "In House";

    try
    {
        connection.Open();


        MessageBox.Show("Payment approved.");
        richTextBox1.Text = richTextBox1.Text + "The hotel received " + txtbx9 + " from this guest";
            string rtb = richTextBox1.Text.ToString();

        OleDbCommand command = new OleDbCommand();

        command.Connection = connection;
        command.CommandText = "INSERT INTO billing(g_name,g_surname,g_company,g_totalrate, g_paid, g_typepaid, info, u_add, u_tadd, g_ad, g_dd, g_amountofdays) VALUES('" + name + "','" + surname + "','" + company + "','" + txtbx8 + "', '" + txtbx9 + "', '" + cmbbx2 + "', '" + rtb + "', '" + label12.Text.ToString() + "', '" + this.dateTimePicker1.Value +"','"+textBox4.Text.ToString()+"','"+textBox5.Text.ToString()+"','"+textBox6.Text.ToString()+"')"; ;
        command.ExecuteNonQuery();

        command = new OleDbCommand();
        command.Connection = connection;
        command.CommandText = "UPDATE guestreg SET g_paidstatus='Paid '"+txtbx9+"'' where g_name ='"+name+"' and g_status = '"+sts"'";

        command.ExecuteNonQuery();

}
}

2 SQL命令插入和更新到不同的表

3 个答案: