C# LLSQL快速查询框架

介绍一种新类型查询方法,类似linq,lambda语法,类似标准的sql使用习惯,支持匿名类型,泛型,目前支持mssql,mysql,

切换只需要DatabaseConfig.DatabaseType = DatabaseType.SQLServer;无需改任何代码,dll后续开放下载

使用说明:基于实体查询,实体名和表名相同,实体需要使用代码生成器生成,工具后续开放下载

只需要生成所有表的实体,其它数据任意查,不需要手写任何Model,

查询结果

     public class Student
     {
         public int ID { get; set; }
         public string Name { get; set; }
         public int Age { get; set; }
         public bool IsGraduate { get; set; }
         public string Grade { get; set; }
         public decimal Money { get; set; }
     }

表对应实体

         /// <summary>
         /// 单表查询
         /// </summary>
         public static void single_able()
         {
             using (var sql = new SqlModel<T_BAS_Areas>())
             {
                 //!+常用方法
                 /*
                     *使用说明
                     *数据查询方法,只有调用后才会有数据返回
                     *ToDataTable(),ToList(),ToPageList(),First(),FirstOrDefault()
                     */
                 //?查默认一条数据
                 var data1 = sql
                     .SqlSelect(a => new { a.AreaName, a.AreaCode })
                     .FirstOrDefault();
                 //?所有字段查询
                 var data1_1 = sql
                     .SqlSelect()
                     .FirstOrDefault();
                 //查询top 10
                 var data1_2 = sql
                     .SqlSelect()
                     .SqlTop()
                     .ToList();
                 //?DataTable
                 var data2 = sql
                     .SqlSelect(a => new { a.AreaName, a.AreaCode })
                     .ToDataTable();
                 //?List
                 var data3 = sql
                     .SqlSelect(a => new { a.AreaName, a.AreaCode })
                     .ToList();
                 //?分页
                 var data4 = sql
                     .SqlPage(a => new { a.AreaName, a.AreaCode })
                     .ToPageList();
                 var data4_1 = sql
                     .SqlPage(a => new { a.AreaName, a.AreaCode }, , )
                     .ToPageList();
                 //?count
                 var data5 = sql
                     .SqlCount(a => a.AreaCode == "");
                 //?sum
                 var data6 = sql
                     .SqlSum(a => new { a.AreaCode })
                     .First();

                 //?无锁查询
                 var data7 = sql
                     .SqlSelect(a => new { a.AreaName, a.AreaCode }, LockType.NOLOCK)
                     .FirstOrDefault();
                 //?指定索引查询
                 var data8 = sql
                     .SqlSelect(a => new { a.AreaName, a.AreaCode }
                     , "PK_T_BAS_AREAS")
                     .FirstOrDefault();

                 //?条件查询
                 var data9 = sql
                     .SqlSelect(a => new { a.AreaName, a.AreaCode })
                     .SqlWhere(a => a.ParentAreaCode == "" && a.AreaName.SqlLike("九江"))
                     .FirstOrDefault();
                 //? 查前10条并排序
                 var data10 = sql
                     .SqlSelect(a => new { a.AreaName, a.ParentAreaCode, a.AreaCode })
                     .SqlTop()
                     .SqlOrderBy(b => new { b.ParentAreaCode, b.AreaCode })
                     .ToList();
                 var data11 = sql
                     .SqlSelect(a => new { a.AreaName, a.ParentAreaCode, a.AreaCode })
                     .SqlTop()
                     .SqlOrderDescBy(b => new { b.ParentAreaCode, b.AreaCode })
                     .ToList();
                 //? 查前10%条并排序
                 var data12 = sql
                     .SqlSelect(a => new { a.AreaName, a.ParentAreaCode, a.AreaCode })
                     .SqlPercent().SqlOrderBy(b => new { b.ParentAreaCode }).ToList();
                 data12 = sql.SqlSelect(a => new { a.AreaName, a.ParentAreaCode, a.AreaCode })
                     .SqlPercent()
                     .SqlOrderDescBy(b => new { b.ParentAreaCode })
                     .SqlOrderBy(c => new { c.AreaCode })
                     .ToList();

                 //?查前10条不重复的项
                 var data13 = sql
                     .SqlSelect(a => new { a.ParentAreaCode, a.AreaCode })
                     .SqlDistinct()
                     .SqlTop()
                     .ToList();

                 //!更新
                 sql.SqlUpdate(a => new object[] { a.AreaName == "溪湖区" },//a.SqlFunc("AreaCode='2'")
                     b => b.AreaGuidGuid == Guid.Parse("949B2F9D-F730-48ED-8B58-000144166BE9"));

                 //!添加
                 T_BAS_Areas area = new T_BAS_Areas()
                 {
                     AreaGuidGuid = Guid.NewGuid(),
                     AreaCode = "",
                     AreaName = "测试",
                     ParentAreaCode = "-1",
                 };
                 sql.SqlAdd(area);
                 //!删除
                 sql.SqlDelete(a => a.AreaGuidGuid == area.AreaGuidGuid);

                 //where 查询
                 var data14 = sql
                     .SqlSelect(a => new { a.AreaName, a.AreaCode })
                     .SqlWhere(a => a.AreaName.SqlLike("六一") && a.AreaCode.SqlFunc("AreaCode=1"))
                     .ToList();
                 var data141 = sql
                     .SqlSelect(a => new { a.AreaName, a.AreaCode })
                     .SqlWhere(a => a.AreaName.SqlLike("%{0}?", "六一")
                         && a.AreaCode.SqlFunc("AreaCode='1'")//a.SqlFunc("AreaCode='1'")
                         || a.AreaCode.SqlFunc("AreaCode=Parent"))
                         .ToList();
             }
         }

单表查询

         /// <summary>
         /// 多表查询
         /// </summary>
         public static void multilist_table()
         {

             using (var sql = new SqlModel<T_ST_Role, T_ST_Role_Permission>())
             {
                 int count;
                 var left = sql.SqlSelect((a, b) => new { NameTest = a.RoleName, b.PermissionCode })
                             .SqlJionLeft((a, b) => b)
                                     .SqlOn((a, b) => a.RoleGuid == b.RoleGuid)
                                     .SqlOrderBy((a, b) => b.PermissionCode)
                                     .SqlWhere((a, b) => a.RoleCode == "")
                                     .ToList();
                 count = left.Count;

                 var right = sql.SqlSelect((a, b) => new { NameTest = a.RoleName, b.PermissionCode })
                             .SqlJionRight((a, b) => b)
                                     .SqlOn((a, b) => a.RoleGuid == b.RoleGuid)
                                     .ToList();

                 var full = sql.SqlSelect((a, b) => new { NameTest = a.RoleName, b.PermissionCode, })
                             .SqlJionFull((a, b) => b)
                                     .SqlOn((a, b) => a.RoleGuid == b.RoleGuid)
                                     .ToList();

                 var inner = sql.SqlSelect((a, b) => new { NameTest = a.RoleName, b.PermissionCode })
                             .SqlJionInner((a, b) => b)
                                     .SqlOn((a, b) => a.RoleGuid == b.RoleGuid)
                                     .ToList();

                 var page = sql.SqlPage((a, b) => new { a.RoleGuid, NameTest = a.RoleName, b.PermissionCode }, , )
                             .SqlJionLeft((a, b) => b).SqlOn((a, b) => a.RoleGuid == b.RoleGuid)
                                 .SqlWhere((a, b) => a.RoleCode == "R000001")
                                 .SqlOrderBy((a, b) => b.PermissionCode)//.SqlOrderBy(o => new { o.PermissionCode })
                                 .ToPageList();

             }

             using (var sql = new SqlModel<T_ST_Role, T_ST_Role_Permission, T_ST_Permission, T_ST_User_Role>())
             {
                 var data = sql.SqlSelect((a, b, c, d) => new { a.RoleGuid, a.RoleName, b.Role_PermissionGuid, c.PermissionCode })
                             .SqlJionLeft((a, b, c, d) => b).SqlOn((a, b, c, d) => a.RoleGuid == b.RoleGuid)
                             .SqlJionRight((a, b, c, d) => c).SqlOn((a, b, c, d) => b.PermissionGuid == c.PermissionGuid)
                             .SqlJionLeft((a, b, c, d) => d).SqlOn((a, b, c, d) => a.RoleGuid == d.RoleGuid)
                                     .ToList();

                 var page = sql.SqlPage((a, b, c, d) => new { a.RoleGuid, a.RoleName, b.Role_PermissionGuid, c.PermissionCode })
                         .SqlJionLeft((a, b, c, d) => b).SqlOn((a, b, c, d) => a.RoleGuid == b.RoleGuid)
                         .SqlJionRight((a, b, c, d) => c).SqlOn((a, b, c, d) => b.PermissionGuid == c.PermissionGuid)
                             .SqlJionLeft((a, b, c, d) => d).SqlOn((a, b, c, d) => a.RoleGuid == d.RoleGuid)
                                 .ToPageList();
             }
         }

多表查询

         /// <summary>
         /// groupby case when then
         /// </summary>
         public static void groupby_casewhenthe()
         {
             using (var sql = new SqlModel<Students>())
             {
                 //case when then查询方式1
                 //CASE WHEN age=16 THEN '16岁' WHEN age=18 THEN '18岁' WHEN age=20 THEN '20岁'else '可选' END AS remark
                 var casewh = sql
                     .SqlNewSelect(a =>
                         new
                         {
                             a.Name,
                             Remark = a.CaseWhen(b => b.Age == ).Then("16岁").When(b => b.Age == ).Then("18岁").When(b => b.Age == ).Then("20岁").Else("其它").End()
                         }).First();
                 //case when then查询方式2 多条件选择
                 //CASE Age WHEN 16 THEN '16岁' WHEN 18 THEN '18岁' WHEN 20 THEN '20岁'else '可选' END AS remark
                 var casewh2 = sql
                     .SqlNewSelect(a =>
                         new
                         {
                             a.Name,
                             Remark = a.Case(a.Age).When().Then("16岁").When().Then("18岁").When().Then("20岁").Else("其它").End()
                         }).First();
                 //group by查询
                 var fun = sql
                     .SqlNewSelect(a => new
                     {
                         a.Name,
                         asName = a.Name.SqlCount(),
                         asAge = a.Age.SqlSum(),
                         asMaxAge = a.Age.SqlMax(),
                         asMinAge = a.Age.SqlMin(),
                         asAvg = a.Age.SqlAVG()
                     })
                     .SqlWhere(a => a.Age == )
                     .SqlGroupBy(a => new { a.Name, a.Age })
                     .SqlHaving(a => a.Name == "name_1500081")
                     .SqlOrderBy(a => a.Name).First();

                 Console.WriteLine(fun.asMaxAge + casewh.Name);
             }
         }

Group查询,Case查询