Query from Single Table
November 21, 2021Less than 1 minuteAbout 261 words
Query from Single Table
static IFreeSql fsql = new FreeSql.FreeSqlBuilder()
.UseConnectionString(FreeSql.DataType.MySql, connectionString)
.Build(); //Be sure to define as singleton mode
class Topic {
[Column(IsIdentity = true)]
public int Id { get; set; }
public string Title { get; set; }
public int Clicks { get; set; }
public DateTime CreateTime { get; set; }
public int CategoryId { get; set; }
}
Single Table
fsql.Select<Topic>()
.Where(a => a.Id == 10)
.ToList();
///SELECT a.`Id`, a.`Clicks`, a.`CategoryId`, a.`Title`, a.`CreateTime`
//FROM `Topic` a
//WHERE (a.`Id` = 10)
fsql.Select<Topic>()
.Where(a => a.Id == 10 && a.Id > 10 || a.Clicks > 100)
.ToList();
///SELECT a.`Id`, a.`Clicks`, a.`CategoryId`, a.`Title`, a.`CreateTime`
//FROM `Topic` a
//WHERE (a.`Id` = 10 AND a.`Id` > 10 OR a.`Clicks` > 100)
fsql.Select<Topic>()
.Where(a => new []{1,2,3}.Contains(a.Id))
.ToList();
//SELECT a.`Id`, a.`Clicks`, a.`CategoryId`, a.`Title`, a.`CreateTime`
//FROM `Topic` a
//WHERE (a.`Id` in (1,2,3))
WithSql
fsql.Select<Topic>()
.WithSql("select * from Topic where clicks > @val", new { val = 10 })
.Page(1, 10)
.ToList()
//SELECT a.`Id`, a.`Clicks`, a.`CategoryId`, a.`Title`, a.`CreateTime`
//FROM (select * from Topic where clicks > @val) a
When
WithSqlis used multiple times, it will be converted toUNION ALLquery