示例代码
Case 1 Code
var data = db.Query<Product>()
.Where(w => db.Query<Product>().WhereIF(!string.IsNullOrWhiteSpace("测试"), a => a.ProductId == 1).Select(s => 1).Any())
.Select(s => new
{
s.ProductId,
s.ProductCode
}).ToList();
Case 1 Sql
SELECT `p1`.`ProductId` AS `ProductId`,`p1`.`ProductCode` AS `ProductCode` FROM `Product` `p1`
WHERE EXISTS ( SELECT 1 FROM `Product` `p2`
WHERE ( `p2`.`ProductId` = 1 ) )
Case 2 Code (如需主表作为条件 需使用Case1 写法)
var existsQuery = db.Query<Product>().WhereIF(!string.IsNullOrWhiteSpace("测试"), a => a.ProductId == 1).Select(s => 1);
var data = db.Query<Product>()
.Where(w => existsQuery.Any())
.Select(s => new
{
s.ProductId,
s.ProductCode
}).ToList();
Case 2 Sql
SELECT `p1`.`ProductId` AS `ProductId`,`p1`.`ProductCode` AS `ProductCode` FROM `Product` `p1`
WHERE EXISTS ( SELECT 1 FROM `Product` `p2`
WHERE ( `p2`.`ProductId` = 1 ) )
Case 3 Code（真实项目写法的伪代码，可自由搭配，基本上可以媲美手写sql）
var queryBuilder = db.Query<Product>()
.Where(a => SqlFunc.Operation(a.CreateTime.ToString("yyyy-MM-dd"), ">=", DateTime.Now.ToString("yyyy-MM-dd")))
.Where(a => db.Query<Product>().Where(b => a.ProductName.Contains("主表") || b.Custom1.Contains("子表")).WhereIF(!string.IsNullOrWhiteSpace("测试"), a => a.ProductId == 1).Select(s => 1).Any())
.Select(s => new
{
s.ProductId,
s.ProductCode
}).QueryBuilder;
Case 3 Print Result
SELECT `p1`.`ProductId` AS `ProductId`,`p1`.`ProductCode` AS `ProductCode` FROM `Product` `p1`
WHERE DATE_FORMAT( `p1`.`CreateTime`,'%Y-%m-%d' ) >= DATE_FORMAT( @Now_1,'%Y-%m-%d' ) AND EXISTS ( SELECT 1 FROM `Product` `p2`
WHERE ( `p1`.`ProductName` LIKE CONCAT( '%','主表','%' ) OR `p2`.`Custom1` LIKE CONCAT( '%','子表','%' ) ) AND ( `p2`.`ProductId` = 1 ) )
参数名称:Now_1 参数值:2023-06-07 18:35:14
3.亮点功能
1.别名自动编排和联表查询一样
2.支持Query 所有非返回结果集方法,结尾需调用Any方法以及重载方法，非常灵活 ！！！
开源项目地址：https://github.com/China-Mr-zhong/Fast-Framework (唯一)
其它查询示例
Select查询 (Case When)
var data = db.Query<Product>().Select(s => new
{
CaseTest1 = SqlFunc.Case(s.Custom1).When("1").Then("xx1").When("2").Then("xx2").Else("xx3").End(),
CaseTest2 = SqlFunc.CaseWhen<string>(s.Custom1 == "1").Then("xx1").When(s.Custom1 == "2").Then("xx2").Else("xx3").End()
}).ToList();
分组查询
var data = db.Query<Product>().GroupBy(s => new
{
s.ProductId,
s.ProductName
}).ToList();
分组聚合查询
var sql = db.Query<Order>().InnerJoin<OrderDetail>((a, b) => a.OrderId == b.OrderId).GroupBy((a, b) => new
{
a.OrderCode
}).Select((a, b) => new
{
a.OrderCode,
Sum_Qty = SqlFunc.Sum(b.Qty)//支持嵌套
}).ToList();
排序查询
var data = db.Query<Product>().OrderBy(s => new
{
s.CreateTime
}).ToList();
//这是多个字段排序使用方法 还有其它重载方法
Having查询
var data = db.Query<Product>().GroupBy(s => new
{
s.ProductId,
s.ProductName
}).Having(s => SqlFunc.Count(s.ProductId) > 1).ToList();
//必须先使用GroupBy方法 懂得都懂
