DbHelper简单的使用

using System;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace WindowsFormsApp3
{
    public partial class FrmMain : Form
    {
        public FrmMain()
        {
            InitializeComponent();
        }
        private string index;

        //新增数据
        private void barLargeButtonItem1_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            string sql = @"INSERT INTO Person.ContactType
                            (Name)
                            VALUES
                            (@Name)";
            SqlParameter[] sqlParameter = new SqlParameter[1];
            sqlParameter[0] = new SqlParameter("@Name", "abbc");
            int i = DbHelper.ExecNonQuery(sql, sqlParameter);
            MessageBox.Show(i.ToString());
        }

        //加载数据
        private void Form1_Load(object sender, EventArgs e)
        {
            string sql = "SELECT ct.ContactTypeID, ct.Name, ct.ModifiedDate FROM Person.ContactType AS ct ";
            gridControl1.DataSource = DbHelper.GetDataTable(sql);
        }

        //更新数据
        private void barLargeButtonItem2_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            string sql = @"UPDATE Person.ContactType
                           SET Name = @Name
                           WHERE ContactTypeID=@ContactTypeID";
            SqlParameter[] sqlParameter = new SqlParameter[2];
            sqlParameter[0] = new SqlParameter("@Name", "Li Sir");
            sqlParameter[1] = new SqlParameter("@ContactTypeID", index);
            int i = DbHelper.ExecNonQuery(sql, sqlParameter);
            MessageBox.Show(i.ToString());
        }

        //获取单元格数据
        private void gridView1_RowCellClick(object sender, DevExpress.XtraGrid.Views.Grid.RowCellClickEventArgs e)
        {
            index = gridView1.GetRowCellDisplayText(e.RowHandle, "ContactTypeID");
        }

        //删除数据
        private void barLargeButtonItem3_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            string sql = @"DELETE FROM Person.ContactType
                           WHERE ContactTypeID=@ContactTypeID";
            SqlParameter[] sqlParameter = new SqlParameter[1];
            sqlParameter[0] = new SqlParameter("@ContactTypeID", index);
            int i = DbHelper.ExecNonQuery(sql, sqlParameter);
            MessageBox.Show(i.ToString());
        }
    }
}