mirror of
https://github.com/nsnail/FreeSql.git
synced 2025-04-22 10:42:52 +08:00
80 lines
2.7 KiB
Markdown
80 lines
2.7 KiB
Markdown
# 删除数据
|
||
|
||
| 方法 | 返回值 | 参数 | 描述 |
|
||
| - | - | - | - |
|
||
| Where | \<this\> | Lambda | 表达式条件，仅支持实体基础成员（不包含导航对象） |
|
||
| Where | \<this\> | string, parms | 原生sql语法条件，Where("id = ?id", new { id = 1 }) |
|
||
| Where | \<this\> | T1 \| IEnumerable<T1> | 传入实体或集合，将其主键作为条件 |
|
||
| WhereExists | \<this\> | ISelect | 子查询是否存在 |
|
||
| ToSql | string | | 返回即将执行的SQL语句 |
|
||
| ExecuteAffrows | long | | 执行SQL语句，返回影响的行数 |
|
||
| ExecuteDeleted | List\<T1\> | | 执行SQL语句，返回被删除的记录 |
|
||
|
||
### 测试代码
|
||
|
||
```csharp
|
||
var mysql = new MySql("Data Source=127.0.0.1;Port=3306;User ID=root;Password=root;Initial Catalog=cccddd;Charset=utf8;SslMode=none;Max pool size=3");
|
||
IDelete<Topic> delete => mysql.Delete<Topic>();
|
||
|
||
[Table(Name = "tb_topic")]
|
||
class Topic {
|
||
[Column(IsIdentity = true, IsPrimary = true)]
|
||
public int Id { get; set; }
|
||
public int Clicks { get; set; }
|
||
public TestTypeInfo Type { get; set; }
|
||
public string Title { get; set; }
|
||
public DateTime CreateTime { get; set; }
|
||
}
|
||
```
|
||
|
||
### 动态条件
|
||
```csharp
|
||
Delete<Topic>(object dywhere)
|
||
```
|
||
dywhere 支持
|
||
|
||
* 主键值
|
||
* new[] { 主键值1, 主键值2 }
|
||
* Topic对象
|
||
* new[] { Topic对象1, Topic对象2 }
|
||
* new { id = 1 }
|
||
|
||
```csharp
|
||
var t1 = mysql.Delete<Topic>(new[] { 1, 2 }).ToSql();
|
||
//DELETE FROM `tb_topic` WHERE (`Id` = 1 OR `Id` = 2)
|
||
|
||
var t2 = mysql.Delete<Topic>(new Topic { Id = 1, Title = "test" }).ToSql();
|
||
//DELETE FROM `tb_topic` WHERE (`Id` = 1)
|
||
|
||
var t3 = mysql.Delete<Topic>(new[] { new Topic { Id = 1, Title = "test" }, new Topic { Id = 2, Title = "test" } }).ToSql();
|
||
//DELETE FROM `tb_topic` WHERE (`Id` = 1 OR `Id` = 2)
|
||
|
||
var t4 = mysql.Delete<Topic>(new { id = 1 }).ToSql();
|
||
//DELETE FROM `tb_topic` WHERE (`Id` = 1)
|
||
```
|
||
|
||
### 删除条件
|
||
|
||
```csharp
|
||
var t5 = delete.Where(a => a.Id == 1).ToSql().Replace("\r\n", "");
|
||
//DELETE FROM `tb_topic` WHERE (`Id` = 1)
|
||
|
||
var t6 = delete.Where("id = ?id", new { id = 1 }).ToSql().Replace("\r\n", "");
|
||
//DELETE FROM `tb_topic` WHERE (id = ?id)
|
||
|
||
var item = new Topic { Id = 1, Title = "newtitle" };
|
||
var t7 = delete.Where(item).ToSql().Replace("\r\n", "");
|
||
//DELETE FROM `tb_topic` WHERE (`Id` = 1)
|
||
|
||
var items = new List<Topic>();
|
||
for (var a = 0; a < 10; a++) items.Add(new Topic { Id = a + 1, Title = $"newtitle{a}", Clicks = a * 100 });
|
||
var t8 = delete.Where(items).ToSql().Replace("\r\n", "");
|
||
//DELETE FROM `tb_topic` WHERE (`Id` IN (1,2,3,4,5,6,7,8,9,10))
|
||
```
|
||
|
||
### 执行命令
|
||
|
||
| 方法 | 返回值 | 参数 | 描述 |
|
||
| - | - | - | - |
|
||
| ExecuteAffrows | long | | 执行SQL语句，返回影响的行数 |
|
||
| ExecuteDeleted | List\<T1\> | | 执行SQL语句，返回被删除的记录 | |