MyNote.DAL/DbHelperSQL.cs

这里只显示每个文件的开头 60 行。登录后可以解锁完整代码。

微信扫码关注公众号，代码整理好后第一时间通知你。

using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MyNote.DAL
{
    public class DbHelperSQL
    {
        private string _connectionString;

        public string ConnectionString
        {
            get { return _connectionString; }
            set { _connectionString = value; }
        }

        public DbHelperSQL(string connectionString)
        {
            this._connectionString = connectionString;
        }

        #region 公用方法
        /// <summary>
        /// 判断是否存在某表的某个字段
        /// </summary>
        /// <param name="tableName">表名称</param>
        /// <param name="columnName">列名称</param>
        /// <returns>是否存在</returns>
        public bool ColumnExists(string tableName, string columnName)
        {
            string sql = "select count(1) from syscolumns where [id]=object_id('" + tableName + "') and [name]='" + columnName + "'";
            object res = GetSingle(sql);
            if (res == null)
            {
                return false;
            }
            return Convert.ToInt32(res) > 0;
        }

        /// <summary>
        /// 取最大ID.
        /// </summary>
        /// <param name="FieldName">列明。</param>
        /// <param name="TableName"></param>
        /// <returns></returns>
        public int GetMaxID(string FieldName, string TableName)
        {
            string strsql = "select max(" + FieldName + ")+1 from " + TableName;
            object obj = GetSingle(strsql);
            if (obj == null)
            {
                return 1;
            }
            else
            {