FreeSql/Docs/delete.md

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	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

IFreeSql fsql = new FreeSql.FreeSqlBuilder()
    .UseConnectionString(FreeSql.DataType.MySql, "Data Source=127.0.0.1;Port=3306;User ID=root;Password=root;Initial Catalog=cccddd;Charset=utf8;SslMode=none;Max pool size=10")
    .Build();
IDelete<Topic> delete => fsql.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

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 }

var t1 = fsql.Delete<Topic>(new[] { 1, 2 }).ToSql();
//DELETE FROM `tb_topic` WHERE (`Id` = 1 OR `Id` = 2)

var t2 = fsql.Delete<Topic>(new Topic { Id = 1, Title = "test" }).ToSql();
//DELETE FROM `tb_topic` WHERE (`Id` = 1)

var t3 = fsql.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 = fsql.Delete<Topic>(new { id = 1 }).ToSql();
//DELETE FROM `tb_topic` WHERE (`Id` = 1)

删除条件

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