From c07ab9298d821028277ceb04cb9391cdbfaa36db Mon Sep 17 00:00:00 2001
From: sunkaixuan <610262374@qq.com>
Date: Sun, 10 Feb 2019 14:26:56 +0800
Subject: [PATCH] Optimize MYSQL 5.6 COUNT Slow

---
 Src/Asp.Net/MySqlTest/Config.cs                          | 6 +++---
 Src/Asp.Net/MySqlTest/Demos/1_Query.cs                   | 9 ++++++++-
 .../Realization/MySql/SqlBuilder/MySqlQueryBuilder.cs    | 5 ++++-
 3 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/Src/Asp.Net/MySqlTest/Config.cs b/Src/Asp.Net/MySqlTest/Config.cs
index b3b355553..48e302503 100644
--- a/Src/Asp.Net/MySqlTest/Config.cs
+++ b/Src/Asp.Net/MySqlTest/Config.cs
@@ -8,8 +8,8 @@ namespace OrmTest
 {
     public class Config
     {
-        public static string ConnectionString = "server=localhost;Database=SqlSugar4xTest;Uid=root;Pwd=root";
-        public static string ConnectionString2 = "server=localhost;Database=SQLSUGAR4XTEST;Uid=root;Pwd=root";
-        public static string ConnectionString3 = "server=localhost;Database=sqlsugar4xtest;Uid=root;Pwd=root";
+        public static string ConnectionString = "server=localhost;Database=SqlSugar4xTest;Uid=root;Pwd=haosql";
+        public static string ConnectionString2 = "server=localhost;Database=SQLSUGAR4XTEST;Uid=root;Pwd=haosql";
+        public static string ConnectionString3 = "server=localhost;Database=sqlsugar4xtest;Uid=root;Pwd=haosql";
     }
 }
diff --git a/Src/Asp.Net/MySqlTest/Demos/1_Query.cs b/Src/Asp.Net/MySqlTest/Demos/1_Query.cs
index 2ed4e632b..c5616ae5c 100644
--- a/Src/Asp.Net/MySqlTest/Demos/1_Query.cs
+++ b/Src/Asp.Net/MySqlTest/Demos/1_Query.cs
@@ -260,6 +260,12 @@ namespace OrmTest.Demo
 
             //skip5
             var skip5 = db.Queryable<Student>().Skip(5).ToList();
+
+
+            var page2 = db.Queryable<Student>().Where(it=>it.Id>0).ToPageList(1,2,ref totalCount);
+
+
+            var page3 = db.SqlQueryable<Student>("SELECT * FROM Student").ToPageList(1, 2, ref totalCount);
         }
         public static void Where()
         {
@@ -332,9 +338,10 @@ namespace OrmTest.Demo
             .Select((st, sc, sc2) => new { st.Name, st.Id, schoolName = sc.Name, schoolName2 = sc2.Name }).ToPageList(1,2);
 
             //join 3 table page 
+            int count = 0;
             var list8 = db.Queryable<Student, School, School>((st, sc, sc2) => st.SchoolId == sc.Id && sc.Id == sc2.Id)
             .OrderBy(st=>st.Id)
-            .Select((st, sc, sc2) => new { st.Name, st.Id, schoolName = sc.Name, schoolName2 = sc2.Name }).ToPageList(1, 2);
+            .Select((st, sc, sc2) => new { st.Name, st.Id, schoolName = sc.Name, schoolName2 = sc2.Name }).ToPageList(1, 2,ref count);
         }
         public static void Funs()
         {
diff --git a/Src/Asp.Net/SqlSugar/Realization/MySql/SqlBuilder/MySqlQueryBuilder.cs b/Src/Asp.Net/SqlSugar/Realization/MySql/SqlBuilder/MySqlQueryBuilder.cs
index 9a722cbad..0e6da9a0b 100644
--- a/Src/Asp.Net/SqlSugar/Realization/MySql/SqlBuilder/MySqlQueryBuilder.cs
+++ b/Src/Asp.Net/SqlSugar/Realization/MySql/SqlBuilder/MySqlQueryBuilder.cs
@@ -63,7 +63,10 @@ namespace SqlSugar
             this.OrderByValue = oldOrderValue;
             return result;
         }
-
+        public override string ToCountSql(string sql)
+        {
+            return Regex.Replace(sql,"^SELECT .+? FROM ", "SELECT COUNT(*) FROM ");
+        }
         #endregion
 
         #region Get SQL Partial