CTL.Data/SqlDB.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。

namespace CTL.Data
{
    using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Data;
    using System.Data.SqlClient;


    public class SqlDB<T> where T : SqlDB<T>, new()
    {
        private static T _instance;
        private static object _lockHelper;

        static SqlDB()
        {
            SqlDB<T>._instance = default(T);
            SqlDB<T>._lockHelper = new object();
        }

        public static T GetInstance()
        {
            if (SqlDB<T>._instance == null)
            {
                lock (SqlDB<T>._lockHelper)
                {
                    if (SqlDB<T>._instance == null)
                    {
                        SqlDB<T>._instance = Activator.CreateInstance<T>();
                    }
                }
            }
            return SqlDB<T>._instance;
        }

        /// <summary>
        /// 存放表的字段
        /// </summary>
        List<string> Colums = new List<string>();

        /// <summary>
        /// 获取总数
        /// </summary>
        /// <param name="tableName">表名或视图名</param>
        /// <param name="condition">条件</param>
        /// <returns></returns>
        public int GetCount(string tableName, string condition)
        {
            if (condition == "") condition = "1=1";
            return (int)SqlHelper.ExecuteScalar("SELECT COUNT(*) FROM " + tableName + " WHERE " + condition);
        }

        /// <summary>
        /// 获取总数,判断是否存在
        /// </summary>
        /// <param name="tableName">表名或视图名</param>
        /// <param name="condition">条件</param>
        /// <returns></returns>
        public bool Exist(string tableName, string condition)
        {