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update

2881099
2022-04-30 11:03:31 +08:00
parent 2707f7ad5b
commit 0255fe7df9
2 changed files with 108 additions and 109 deletions
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103
With-Sql.md

@@ -36,21 +36,21 @@ Different query results:
```csharp
DataTable dt1 = _fsql.Select<object>()
.WithSql("select * from TestClass ")
.ToDataTable("ID,Age");
.WithSql("select * from TestClass ")
.ToDataTable("ID,Age");
```
```sql
SELECT ID,Age
FROM(select * from TestClass ) a
FROM(select * from TestClass ) a
```
### Return to DataTable with all columns
```csharp
DataTable dt2 = _fsql.Select<object>()
.WithSql("select * from TestClass ")
.ToDataTable("*");
.WithSql("select * from TestClass ")
.ToDataTable("*");
```
```sql
SELECT *
@@ -62,25 +62,25 @@ FROM ( select * from TestClass ) a
```csharp
List<(string,string)> list1 = _fsql
.Select<object>()
.WithSql("select * from TestClass ")
.ToList<(string, string)>("ID,Age");
.WithSql("select * from TestClass ")
.ToList<(string, string)>("ID,Age");
```
```sql
SELECT ID, Age
FROM(select * from TestClass ) a
FROM(select * from TestClass ) a
```
### Return List\<object\>
```csharp
var list2 = _fsql.Select<object>()
.WithSql("select * from TestClass ")
.ToList<object>("*");
.WithSql("select * from TestClass ")
.ToList<object>("*");
```
```sql
SELECT *
FROM(select * from TestClass ) a
FROM(select * from TestClass ) a
```
### Return List\<object\> and support paging
@@ -88,16 +88,16 @@ SELECT *
```csharp
var list3 = _fsql.Select<object>()
.WithSql("select * from TestClass ")
.WhereIf(true, "1=1")
.Page(1, 10).OrderBy("ID DESC")
.ToList<object>("ID,Age");
.WhereIf(true, "1=1")
.Page(1, 10).OrderBy("ID DESC")
.ToList<object>("ID,Age");
```
```sql
SELECT ID, Age
FROM(select * from TestClass ) a
WHERE(1 = 1)
ORDER BY ID DESC
limit 0,10
FROM(select * from TestClass ) a
WHERE(1 = 1)
ORDER BY ID DESC
limit 0,10
```
### Return List\<TestClassDto\> and support paging
@@ -105,18 +105,18 @@ SELECT ID, Age
```csharp
var list4 = _fsql.Select<object>()
.WithSql("select * from TestClass ")
.WhereIf(true, "1=1")
.Page(1, 10)
.OrderBy("ID DESC")
.ToList<TestClssDto>("ID,Age,BIRTH_DAY as Birthday");
.WhereIf(true, "1=1")
.Page(1, 10)
.OrderBy("ID DESC")
.ToList<TestClssDto>("ID,Age,BIRTH_DAY as Birthday");
```
```sql
SELECT ID, Age,BIRTH_DAY as Birthday
FROM(select * from TestClass ) a
WHERE(1 = 1)
ORDER BY ID DESC
limit 0,10
FROM(select * from TestClass ) a
WHERE(1 = 1)
ORDER BY ID DESC
limit 0,10
```
@@ -183,14 +183,11 @@ fsql.Ado.CommandFluent($"{sql1} UNION ALL {sql2}")
.ExecuteDataTable();
```
## Paging Problem
After using `UNION ALL`, there will be a problem if you paginate directly. Please see the specific example:
### There is a problem with using WithSql + Page multiple times: There is a paging statement in each WithSql
There is a problem with using WithSql + Page multiple times: There is a paging statement in each WithSql
```csharp
var sql1 = fsql.Select<Topic>()
@@ -205,18 +202,18 @@ fsql.Select<Topic>().WithSql(sql1).WithSql(sql2).Page(1, 20).ToList();
```sql
SELECT * from (SELECT a.`Id`, a.`Clicks`, a.`TypeGuid`, a.`Title`, a.`CreateTime`
FROM ( SELECT a.`Id`, a.`Clicks`, a.`TypeGuid`, a.`Title`, a.`CreateTime`
FROM `tb_topic` a
WHERE ((a.`Title`) LIKE '%xxx%') ) a
limit 0,20) ftb
UNION ALL
SELECT * from (SELECT a.`Id`, a.`Clicks`, a.`TypeGuid`, a.`Title`, a.`CreateTime`
FROM ( SELECT a.`Id`, a.`Clicks`, a.`TypeGuid`, a.`Title`, a.`CreateTime`
FROM `tb_topic` a
WHERE ((a.`Title`) LIKE '%yyy%') ) a
limit 0,20) ftb
FROM ( SELECT a.`Id`, a.`Clicks`, a.`TypeGuid`, a.`Title`, a.`CreateTime`
FROM `tb_topic` a
WHERE ((a.`Title`) LIKE '%xxx%') ) a
limit 0,20) ftb
UNION ALL
SELECT * from (SELECT a.`Id`, a.`Clicks`, a.`TypeGuid`, a.`Title`, a.`CreateTime`
FROM ( SELECT a.`Id`, a.`Clicks`, a.`TypeGuid`, a.`Title`, a.`CreateTime`
FROM `tb_topic` a
WHERE ((a.`Title`) LIKE '%yyy%') ) a
limit 0,20) ftb
```
@@ -232,30 +229,30 @@ Call WithSql multiple times. If you need to paging, you need to follow the two s
```csharp
var sql = fsql.Select<Topic>()
.WithSql("SELECT * FROM tb_topic where id > 11")
.WithSql("SELECT * FROM tb_topic where id < 10")
.ToSql("*")
.WithSql("SELECT * FROM tb_topic where id > 11")
.WithSql("SELECT * FROM tb_topic where id < 10")
.ToSql("*")
```
The above code will be generated as a Sql statement using `UNION ALL`:
```sql
SELECT * from (SELECT *
FROM ( SELECT * FROM tb_topic where id > 11 ) a) ftb
SELECT * from (SELECT *
FROM ( SELECT * FROM tb_topic where id > 11 ) a) ftb
UNION ALL
UNION ALL
SELECT * from (SELECT *
FROM ( SELECT * FROM tb_topic where id < 10 ) a) ftb
SELECT * from (SELECT *
FROM ( SELECT * FROM tb_topic where id < 10 ) a) ftb
```
- Step 2: on the basis of the SQL statement containing `UNION ALL`, page by calling the `Page` method:
```csharp
var sql2 = g.mysql.Select<Topic>()
.WithSql(sql)
.Page(2, 10)
.ToSql();
.WithSql(sql)
.Page(2, 10)
.ToSql();
```
```sql
SELECT a.`Id`, a.`Clicks`, a.`TypeGuid`, a.`Title`, a.`CreateTime`

114
withsql.md

@@ -40,21 +40,21 @@
```csharp
DataTable dt1 = _fsql.Select<object>()
.WithSql("select * from TestClass ")
.ToDataTable("ID,Age");
.WithSql("select * from TestClass ")
.ToDataTable("ID,Age");
```
```sql
SELECT ID,Age
FROM(select * from TestClass ) a
FROM(select * from TestClass ) a
```
### 2.返回DataTable
```csharp
DataTable dt2 = _fsql.Select<object>()
.WithSql("select * from TestClass ")
.ToDataTable("*");
.WithSql("select * from TestClass ")
.ToDataTable("*");
```
```sql
SELECT *
@@ -66,25 +66,25 @@ FROM ( select * from TestClass ) a
```csharp
List<(string,string)> list1 = _fsql
.Select<object>()
.WithSql("select * from TestClass ")
.ToList<(string, string)>("ID,Age");
.WithSql("select * from TestClass ")
.ToList<(string, string)>("ID,Age");
```
```sql
SELECT ID, Age
FROM(select * from TestClass ) a
FROM(select * from TestClass ) a
```
### 4.返回`List<object>`
```csharp
var list2 = _fsql.Select<object>()
.WithSql("select * from TestClass ")
.ToList<object>("*");
.WithSql("select * from TestClass ")
.ToList<object>("*");
```
```sql
SELECT *
FROM(select * from TestClass ) a
FROM(select * from TestClass ) a
```
### 5.返回`List<object>` 且能支持分页
@@ -92,16 +92,16 @@ SELECT *
```csharp
var list3 = _fsql.Select<object>()
.WithSql("select * from TestClass ")
.WhereIf(true, "1=1")
.Page(1, 10).OrderBy("ID DESC")
.ToList<object>("ID,Age");
.WhereIf(true, "1=1")
.Page(1, 10).OrderBy("ID DESC")
.ToList<object>("ID,Age");
```
```sql
SELECT ID, Age
FROM(select * from TestClass ) a
WHERE(1 = 1)
ORDER BY ID DESC
limit 0,10
FROM(select * from TestClass ) a
WHERE(1 = 1)
ORDER BY ID DESC
limit 0,10
```
### 6.返回`List<TestClassDto>`且能支持分页
@@ -109,18 +109,18 @@ SELECT ID, Age
```csharp
var list4 = _fsql.Select<object>()
.WithSql("select * from TestClass ")
.WhereIf(true, "1=1")
.Page(1, 10)
.OrderBy("ID DESC")
.ToList<TestClssDto>("ID,Age,BIRTH_DAY as Birthday");
.WhereIf(true, "1=1")
.Page(1, 10)
.OrderBy("ID DESC")
.ToList<TestClssDto>("ID,Age,BIRTH_DAY as Birthday");
```
```sql
SELECT ID,Age,BIRTH_DAY as Birthday
FROM(select * from TestClass ) a
WHERE(1 = 1)
ORDER BY ID DESC
limit 0,10
FROM(select * from TestClass ) a
WHERE(1 = 1)
ORDER BY ID DESC
limit 0,10
```
@@ -187,13 +187,12 @@ fsql.Ado.CommandFluent($"{sql1} UNION ALL {sql2}")
.ExecuteDataTable();
```
## 分页问题
Union All 之后 如果直接 分页会有一个问题。请看具体示例
多次 WithSql + Page 存在问题：每个WithSql内都有一个Page分页
### 多次WithSql+Page存在问题：每个WithSql内都有一个Page分页
```csharp
var sql1 = fsql.Select<Topic>()
.Where(a => a.Title.Contains("xxx"))
@@ -207,18 +206,18 @@ fsql.Select<Topic>().WithSql(sql1).WithSql(sql2).Page(1, 20).ToList();
```sql
SELECT * from (SELECT a.`Id`, a.`Clicks`, a.`TypeGuid`, a.`Title`, a.`CreateTime`
FROM ( SELECT a.`Id`, a.`Clicks`, a.`TypeGuid`, a.`Title`, a.`CreateTime`
FROM `tb_topic` a
WHERE ((a.`Title`) LIKE '%xxx%') ) a
limit 0,20) ftb
UNION ALL
SELECT * from (SELECT a.`Id`, a.`Clicks`, a.`TypeGuid`, a.`Title`, a.`CreateTime`
FROM ( SELECT a.`Id`, a.`Clicks`, a.`TypeGuid`, a.`Title`, a.`CreateTime`
FROM `tb_topic` a
WHERE ((a.`Title`) LIKE '%yyy%') ) a
limit 0,20) ftb
FROM ( SELECT a.`Id`, a.`Clicks`, a.`TypeGuid`, a.`Title`, a.`CreateTime`
FROM `tb_topic` a
WHERE ((a.`Title`) LIKE '%xxx%') ) a
limit 0,20) ftb
UNION ALL
SELECT * from (SELECT a.`Id`, a.`Clicks`, a.`TypeGuid`, a.`Title`, a.`CreateTime`
FROM ( SELECT a.`Id`, a.`Clicks`, a.`TypeGuid`, a.`Title`, a.`CreateTime`
FROM `tb_topic` a
WHERE ((a.`Title`) LIKE '%yyy%') ) a
limit 0,20) ftb
```
@@ -226,39 +225,42 @@ limit 0,20) ftb
WithSql 可以和 AsTable 实现分表的功能。
分表跨表查询的时候，分页是要向每个子表（即每个WithSql中的SQL分页）都生效。
分表跨表查询的时候，分页是要向每个子表（即每个 WithSql 中的 SQL 分页）都生效。
## 解决方案
### 多次withsql，如需分页，需要按下面的二步操作
多次 withsql ，如需分页，需要按下面的二步操作
- 第一步：通过witsql，将二个sql组成一个sql。
```csharp
var sql = fsql.Select<Topic>()
.WithSql("SELECT * FROM tb_topic where id > 11")
.WithSql("SELECT * FROM tb_topic where id < 10")
.ToSql("*")
.WithSql("SELECT * FROM tb_topic where id > 11")
.WithSql("SELECT * FROM tb_topic where id < 10")
.ToSql("*")
```
如上生成的UOION ALL的sql
如上生成的 UOION ALL 的 sql
```sql
SELECT * from (SELECT *
FROM ( SELECT * FROM tb_topic where id > 11 ) a) ftb
SELECT * from (SELECT *
FROM ( SELECT * FROM tb_topic where id > 11 ) a) ftb
UNION ALL
UNION ALL
SELECT * from (SELECT *
FROM ( SELECT * FROM tb_topic where id < 10 ) a) ftb
SELECT * from (SELECT *
FROM ( SELECT * FROM tb_topic where id < 10 ) a) ftb
```
- 第二步：之后 调用Page则是通过Union ALL后的结果上分页
- 第二步：之后 调用 Page 则是通过 Union ALL 后的结果上分页
```csharp
var sql2 = g.mysql.Select<Topic>()
.WithSql(sql)
.Page(2, 10)
.ToSql();
.WithSql(sql)
.Page(2, 10)
.ToSql();
```
```sql
SELECT a.`Id`, a.`Clicks`, a.`TypeGuid`, a.`Title`, a.`CreateTime`
FROM ( SELECT * from (SELECT *