SqlSugar 基础知识-编程知识

SqlSugar 基础知识

news/2024/10/4 18:38:45/文章来源:https://www.cnblogs.com/lgx5/p/18442322

1、实体特性
[SugarColumn(IsPrimaryKey = true)] 标识是否为主键
[SugarColumn(IsIdentity = true)] 是否为自增长
[SugarColumn(ColumnName = "id")] 对应数据库表里面的某列
[SugarColumn(IsIgnore = true)] 忽略熟悉，在ORM会过滤掉
[SugarColumn(ColumnDescription = "创建时间")] 描述

[SugarTable("base_student")]
public class Student
{/// <summary>/// IsPrimaryKey 标识是否为主键/// IsIdentity 是否为自增长/// </summary>[SugarColumn(IsPrimaryKey = true, IsIdentity = true, ColumnName = "id")]public string Id { get; set; }/// <summary>/// 定义别名进来Mapping，对应数据库表里面的Remark列/// </summary>[SugarColumn(ColumnName = "student_name", ColumnDescription = "用户名")]public string Name { get; set; }/// <summary>/// IsIgnore 不做数据库操作，true将不会进行查询、添加等操作/// </summary>[SugarColumn(ColumnName = "created_time", IsIgnore = true, ColumnDescription = "创建时间")]public DateTime CreatedTime { get; set; } //这列在ORM会过滤掉
}

2、联合查询（一）

public List<MenuDo> GetListByRoleId(string roleId, string sid)
{var result = Context.db.Queryable<RoleMenuDo, MenuDo>((rm, m) => new object[]{JoinType.Left, rm.MenuId ==m.Id}).Where((rm, m) => rm.RoleId == roleId && rm.MenuType == 1&& rm.Status != "D" && rm.SchoolId == sid&& m.Status != "D" && m.SchoolId == sid).OrderBy((rm, m) => m.Sort, OrderByType.Desc).Select((rm, m) => new{Id = m.Id,MenuName = m.MenuName,ControllerName = m.ControllerName,ActionName = m.ActionName,Url = m.Url,ParentId = m.ParentId,Sort = m.Sort,Icon = m.Icon,}).ToList().Select(x => new MenuDo{Id = x.Id,//MenuType = item.MenuType,MenuName = x.MenuName,ControllerName = x.ControllerName,ActionName = x.ActionName,Url = x.Url,Icon = x.Icon,ParentId = x.ParentId,}).ToList();return result;
}

3、联合查询（二）

var result1 = Context.db.Queryable<ClassDo, GradeDo>((c, g) => new object[]{ JoinType.Left, c.GradeId == g.Id }).Where((c, g) => c.SchoolId == sid && c.Status != "D" && g.SchoolId == sid && g.Status != "D").WhereIF(string.IsNullOrEmpty(name), (c, g) =>c.ClassName.Contains(name) || c.ClassCode.Contains(name) || g.GradeName.Contains(name) || g.GradeCode.Contains(name)).Select<ClassViewModel>().ToPageList(pageIndex, pageSize, ref total);

4、联合查询 - 简化

public Equipment GetModelByID(string id, string sid)
{var result = Context.db.Queryable<Equipment, Dormitory>((e, d) => e.DormitoryId == d.Id).Where((e, d) => e.SchoolId == sid && e.Status != "D" && d.SchoolId == sid && d.Status != "D").Select((e, d) => new Equipment{Id = e.Id,EquipmentCode = e.EquipmentCode,EquipmentName = e.EquipmentName,Location = e.Location,DormitoryId = e.DormitoryId,DormitoryName = d.DormitoryName,Mac = e.Mac,Ip = e.Ip,InOutType = e.InOutType,Describe = e.Describe,Sort = e.Sort,}).First();return Mapper.Map<Equipment>(result);
}//2表查询
var list5 = db.Queryable<Student, School>((st, sc) => st.SchoolId == sc.Id).Select((st,sc)=>new {st.Name,st.Id,schoolName=sc.Name}).ToList();//3表查询
var list6 = db.Queryable<Student, School,School>((st, sc,sc2) => st.SchoolId == sc.Id&&sc.Id==sc2.Id).Select((st, sc,sc2) => new { st.Name, st.Id, schoolName = sc.Name,schoolName2=sc2.Name }).ToList();//3表查询分页
var list7= db.Queryable<Student, School, School>((st, sc, sc2) => st.SchoolId == sc.Id && sc.Id == sc2.Id)
.Select((st, sc, sc2) => new { st.Name, st.Id, schoolName = sc.Name, schoolName2 = sc2.Name }).ToPageList(1,2);

5、WHERE条件查询

var query = Context.SqlQueryable<StudentDto>(sql).Where(x => x.Status != "D").Where(x => grades.Select(g => new { GradeId = g.Id }).JoinAsString(",").Contains(x.GradeId)&& classes.Select(c => new { ClassId = c.Id }).JoinAsString(",").Contains(x.ClassId)).WhereIF(request.SchoolId.HasValue(), x => x.SchoolId == request.SchoolId).WhereIF(request.ClassId.HasValue(), x => x.ClassId == request.ClassId).WhereIF(request.GradeId.HasValue(), x => x.GradeId == request.GradeId).WhereIF(request.Search.HasValue(), x => x.StudentName == request.Search || x.StudentCode== request.Search).WhereIF(request.NameOrCode.HasValue(),x => x.StudentName.Contains(request.NameOrCode) || x.StudentCode.Contains(request.NameOrCode));

Between ... AND ...

db.Queryable<Student>().Where(it => SqlFunc.Between(it.Id, 1, 20)).ToList();

6、Insert 新增批量插入

var insertData = new course() { };//测试参数
var insertArray = new course[] { insertData };
courseDb.Insert(insertData);//插入
courseDb.InsertRange(insertArray);//批量插入
var id = courseDb.InsertReturnIdentity(insertData);//插入返回自增列
courseDb.AsInsertable(insertData).ExecuteCommand();//我们可以转成 Insertable实现复杂插入
var insertObjs = new List<Student>(); //批量插入
var s9 = db.Insertable(insertObjs.ToArray()).ExecuteCommand();
//注意 ： SqlSever 建表语句带有Wtih(设置)，如果设置不合理，可能会引起慢，把With删掉就会很快

7、Update 修改

var updateData = new course() {  };//测试参数
var updateArray = new course[] { updateData };//测试参数
courseDb.Update(updateData);//根据实体更新
courseDb.UpdateRange(updateArray);//批量更新
// 只更新Name列和CreateTime列，其它列不更新，条件id=1
//courseDb.Update(it => new course() { Name = "a", CreateTime = DateTime.Now }, it => it.id==1);
courseDb.AsUpdateable(updateData).ExecuteCommand();

8、删除

var deldata = new course() {  };//测试参数
courseDb.Delete(deldata);//根据实体删除
courseDb.DeleteById(1);//根据主键删除
courseDb.DeleteById(new int[] { 1,2});//根据主键数组删除
courseDb.Delete(it=>1==2);//根据条件删除
courseDb.AsDeleteable().Where(it=>1==2).ExecuteCommand();//转成Deleteable实现复杂的操作

9、MySQL 存储过程

-- ----------------------------
-- Procedure structure for delete_data
-- ----------------------------
DROP PROCEDURE IF EXISTS `delete_data`;
DELIMITER ;;
CREATE DEFINER=`root`@`%` PROCEDURE `delete_data`(in sid VARCHAR(36))
BEGINDELETE FROM base_grade WHERE school_id=sid;DELETE FROM sys_user_info WHERE school_id=sid AND (mobile IS NULL OR mobile != 'admin');SET @adminId = '';SELECT @adminId := id FROM sys_user_info WHERE school_id=sid AND mobile = 'admin';DELETE FROM sys_user_role WHERE school_id=sid and user_id != @adminId;
END;;
DELIMITER ;

10、事务
10.1、无数据返回只返回状态

var result = Context.db.Ado.UseTran(() =>
{#region//Context.db.Deleteable<GradeDo>(x => x.SchoolId == grades[0].SchoolId).ExecuteCommand();//Context.db.Deleteable<ClassDo>(x => x.SchoolId == grades[0].SchoolId).ExecuteCommand();#endregion#region 执行存储过程删除Context.db.Ado.UseStoredProcedure().GetDataTable("proc_data_delete", new { sid = grades[0].SchoolId });#endregionif (grades != null && grades.Count > 0)Context.db.Insertable(grades.ToArray()).ExecuteCommand();if (classes != null && classes.Count > 0)Context.db.Insertable(classes.ToArray()).ExecuteCommand();
});
// result.ErrorException
// result.IsSuccess

10.2、返回数据并且返回状态

var result2 = db.Ado.UseTran<List<Student>>(() =>
{return db.Queryable<Student>().ToList();
});
// result.ErrorException
// result.IsSuccess
// result.Data

10.3、使用try catch来处理事务，用这种方式事务一定要加try catch回滚不然会锁表，在操作就卡死

try
{Context.db.Ado.BeginTran();#region 方式1//Context.db.Deleteable<GradeDo>(x => x.SchoolId == grades[0].SchoolId).ExecuteCommand();//Context.db.Deleteable<ClassDo>(x => x.SchoolId == grades[0].SchoolId).ExecuteCommand();#endregion#region 执行存储过程删除Context.db.Ado.UseStoredProcedure().GetDataTable("proc_data_delete", new { sid = grades[0].SchoolId });#endregionif (grades != null && grades.Count > 0)Context.db.Insertable(grades.ToArray()).ExecuteCommand();if (classes != null && classes.Count > 0)Context.db.Insertable(classes.ToArray()).ExecuteCommand();if (dormitorys != null && dormitorys.Count > 0)Context.db.Insertable(dormitorys.ToArray()).ExecuteCommand();Context.db.Ado.CommitTran();
}
catch (Exception)
{Context.db.Ado.RollbackTran();throw;
}
return true;

11、排序

db.Queryable<teacher>().OrderBy("sort desc")db.Queryable<teacher>()
.OrderBy(it => it.Id) //asc
.OrderBy(it => it.Name, OrderByType.Desc) //desc
.ToList()