时间：2021-07-01 10:21:17 帮助过：18人阅读
2.打包用法，推荐
/// <summary> /// SqlSugar /// </summary> public class SugarDao { private SugarDao() { } public static string ConnectionString { get { string reval = "server=.;uid=sa;pwd=sasa;database=SqlSugarTest"; return reval; } } public static SqlSugarClient GetInstance() { var db = new SqlSugarClient(ConnectionString); db.IsEnableLogEvent = true;//Enable log events db.LogEventStarting = (sql, par) => { Console.WriteLine(sql + " " + par+"\r\n"); }; return db; } }
使用打包对象
using (var db = SugarDao.GetInstance()) { var list=db.Queryable<T>().ToList(); }
3.高级玩法，基于IOC和指挥官模式的DEMO
https://github.com/sunkaixuan/ASPNETMVCCRUDDEMO
1. Queryable 拉姆达查询
//查询所有
var student = db.Queryable<Student>().ToList();
var studentDynamic = db.Queryable<Student>().ToDynamic();
var studentJson = db.Queryable<Student>().ToJson();
//查询单条
var single = db.Queryable<Student>().Single(c => c.id == 1);
//查询单条根据主键
var singleByPk = db.Queryable<Student>().InSingle(1);
//查询单条没有记录返回空对象
var singleOrDefault = db.Queryable<Student>().SingleOrDefault(c => c.id == 11111111);
//查询单条没有记录返回空对象
var single2 = db.Queryable<Student>().Where(c => c.id == 1).SingleOrDefault();
//查询第一条
var first = db.Queryable<Student>().Where(c => c.id == 1).First();
var first2 = db.Queryable<Student>().Where(c => c.id == 1).FirstOrDefault();
//取11-20条
var page1 = db.Queryable<Student>().Where(c => c.id > 10).OrderBy(it => it.id).Skip(10).Take(10).ToList();
//取11-20条 等于 Skip(pageIndex-1)*pageSize).Take(pageSize) 等于 between (pageIndex-1)*pageSize and pageIndex*pageSize
var page2 = db.Queryable<Student>().Where(c => c.id > 10).OrderBy(it => it.id).ToPageList(2, 10);
//查询条数
var count = db.Queryable<Student>().Where(c => c.id > 10).Count();
//从第2条开始以后取所有
var skip = db.Queryable<Student>().Where(c => c.id > 10).OrderBy(it => it.id).Skip(2).ToList();
//取前2条
var take = db.Queryable<Student>().Where(c => c.id > 10).OrderBy(it => it.id).Take(2).ToList();
//Not like
string conval = "a";
var notLike = db.Queryable<Student>().Where(c => !c.name.Contains(conval.ToString())).ToList();
//Like
conval = "三";
var like = db.Queryable<Student>().Where(c => c.name.Contains(conval)).ToList();
//支持字符串Where 让你解决，更复杂的查询
var student12 = db.Queryable<Student>().Where(c => "a" == "a").Where("id>@id", new { id = 1 }).ToList();
var student13 = db.Queryable<Student>().Where(c => "a" == "a").Where("id>100 and id in( select 1)").ToList();
//存在记录反回true，则否返回false
bool isAny100 = db.Queryable<Student>().Any(c => c.id == 100);
bool isAny1 = db.Queryable<Student>().Any(c => c.id == 1);
//获取最大Id
object maxId = db.Queryable<Student>().Max(it => it.id);
int maxId1 = db.Queryable<Student>().Max(it => it.id).ObjToInt();//拉姆达
int maxId2 = db.Queryable<Student>().Max<int>("id"); //字符串写法
//获取最小
int minId1 = db.Queryable<Student>().Where(c => c.id > 0).Min(it => it.id).ObjToInt();//拉姆达
int minId2 = db.Queryable<Student>().Where(c => c.id > 0).Min<int>("id");//字符串写法
//order By
var orderList = db.Queryable<Student>().OrderBy("id desc,name asc").ToList();//字符串支持多个排序
//可以多个order by表达示
var order2List = db.Queryable<Student>().OrderBy(it => it.name).OrderBy(it => it.id, OrderByType.desc).ToList(); // order by name as ,order by id desc
//In
var intArray = new[] { "5", "2", "3" };
var intList = intArray.ToList();
var listnew = db.Queryable<Student>().Where(it => intArray.Contains(it.name)).ToList();
var list0 = db.Queryable<Student>().In(it => it.id, 1, 2, 3).ToList();
var list1 = db.Queryable<Student>().In(it => it.id, intArray).ToList();
var list2 = db.Queryable<Student>().In("id", intArray).ToList();
var list3 = db.Queryable<Student>().In(it => it.id, intList).ToList();
var list4 = db.Queryable<Student>().In("id", intList).ToList();
var list6 = db.Queryable<Student>().In(intList).ToList();//不设置字段默认主键
//分组查询
var list7 = db.Queryable<Student>().Where(c => c.id < 20).GroupBy(it => it.sex).Select("sex,count(*) Count").ToDynamic();
var list8 = db.Queryable<Student>().Where(c => c.id < 20).GroupBy(it => it.sex).GroupBy(it => it.id).Select("id,sex,count(*) Count").ToDynamic();
List<StudentGroup> list9 = db.Queryable<Student>().Where(c => c.id < 20).GroupBy(it => it.sex).Select<StudentGroup>("Sex,count(*) Count").ToList();
List<StudentGroup> list10 = db.Queryable<Student>().Where(c => c.id < 20).GroupBy("sex").Select<StudentGroup>("Sex,count(*) Count").ToList();
//SELECT Sex,Count=count(*) FROM Student WHERE 1=1 AND (id < 20) GROUP BY Sex --生成结果
//2表关联查询
var jList = db.Queryable<Student>()
.JoinTable<School>((s1, s2) => s1.sch_id == s2.id) //默认left join
.Where<School>((s1, s2) => s1.id == 1)
.Select("s1.*,s2.name as schName")
.ToDynamic();
/*等于同于
SELECT s1.*,s2.name as schName
FROM [Student] s1
LEFT JOIN [School] s2 ON s1.sch_id = s2.id
WHERE s1.id = 1 */
//2表关联查询并分页
var jList2 = db.Queryable<Student>()
.JoinTable<School>((s1, s2) => s1.sch_id == s2.id) //默认left join
//如果要用inner join这么写
//.JoinTable<School>((s1, s2) => s1.sch_id == s2.id ,JoinType.INNER)
.Where<School>((s1, s2) => s1.id > 1)
.OrderBy(s1 => s1.name)
.Skip(10)
.Take(20)
.Select("s1.*,s2.name as schName")
.ToDynamic();
//3表查询并分页
var jList3 = db.Queryable<Student>()
.JoinTable<School>((s1, s2) => s1.sch_id == s2.id) // left join School s2 on s1.id=s2.id
.JoinTable<School>((s1, s3) => s1.sch_id == s3.id) // left join School s3 on s1.id=s3.id
.Where<School>((s1, s2) => s1.id > 1) // where s1.id>1
.Where(s1 => s1.id > 0)
.OrderBy<School>((s1, s2) => s1.id) //order by s1.id 多个order可以 .oderBy().orderby 叠加
.Skip(10)
.Take(20)
.Select("s1.*,s2.name as schName,s3.name as schName2")//select目前只支持这种写法
.ToDynamic();
//上面的方式都是与第一张表join，第三张表想与第二张表join写法如下
List<V_Student> jList4 =
db.Queryable<Student>()
.JoinTable<School>((s1, s2) => s1.sch_id == s2.id) // left join School s2 on s1.id=s2.id
.JoinTable<School, Area>((s1, s2, a1) => a1.id == s2.AreaId)// left join Area a1 on a1.id=s2.AreaId 第三张表与第二张表关联
.JoinTable<Area, School>((s1, a1, s3) => a1.id == s3.AreaId)// left join School s3 on a1.id=s3.AreaId 第四第表第三张表关联
.JoinTable<School>((s1, s4) => s1.sch_id == s4.id) // left join School s2 on s1.id=s4.id
.Select<School, Area, V_Student>((s1, s2, a1) => new V_Student { id = s1.id, name = s1.name, SchoolName = s2.name, AreaName = a1.name }).ToList();
//等同于
//SELECT id = s1.id, name = s1.name, SchoolName = s2.name, AreaName = a1.name
//FROM [Student] s1
//LEFT JOIN School s2 ON ( s1.sch_id = s2.id )
//LEFT JOIN Area a1 ON ( a1.id = s2.AreaId ) //第三张表与第二张表关联
//LEFT JOIN School s3 ON ( a1.id = s3.AreaId ) //第四张表与第三张表关联
//LEFT JOIN School s4 ON ( s1.sch_id = s4.id )
//WHERE 1=1
//Join子查询语句加分页的写法
var childQuery = db.Queryable<Area>().Where("id=@id").Select(it => new { id = it.id }).ToSql();//创建子查询SQL
string childTableName =SqlSugarTool.PackagingSQL(childQuery.Key);//将SQL语句用()包成表
var queryable = db.Queryable<Student>()
.JoinTable<School>((s1, s2) => s1.sch_id == s2.id) //LEFT JOIN School s2 ON ( s1.sch_id = s2.id )
.JoinTable(childTableName, "a1", "a1.id=s2.areaid", new { id = 1 }, JoinType.INNER) //INNER JOIN (SELECT * FROM [Area] WHERE 1=1 AND id=@id ) a1 ON a1.id=s2.areaid
.OrderBy(s1 => s1.id);
var list = queryable.Select<School, Area, V_Student>((s1, s2, a1) => new V_Student { id = s1.id, name = s1.name, SchoolName = s2.name, AreaName = a1.name })
.ToPageList(0, 200);
var count2 = queryable.Count();
//拼接例子
var queryable2 = db.Queryable<Student>().Where(it => true);
if (maxId.ObjToInt() == 1)
{
queryable2.Where(it => it.id == 1);
}
else
{
queryable2.Where(it => it.id == 2);
}
var listJoin = queryable2.ToList();
//queryable和SqlSugarClient解耦
var par = new Queryable<Student>().Where(it => it.id == 1);//声名没有connection对象的Queryable
par.DB = db;
var listPar = par.ToList();
//查看生成的sql和参数
var id = 1;
var sqlAndPars = db.Queryable<Student>().Where(it => it.id == id).OrderBy(it => it.id).ToSql();
//拉姆达支持的函数操作
var par1 = "2015-1-1"; var par2 = " 我 有空格A, ";
var r1 = db.Queryable<Student>().Where(it => it.name == par1.ObjToString()).ToList(); //ObjToString会将null转转成""
var r2 = db.Queryable<InsertTest>().Where(it => it.d1 == par1.ObjToDate()).ToList();
var r3 = db.Queryable<InsertTest>().Where(it => it.id == 1.ObjToInt()).ToList();//ObjToInt会将null转转成0
var r4 = db.Queryable<InsertTest>().Where(it => it.id == 2.ObjToDecimal()).ToList();
var r5 = db.Queryable<InsertTest>().Where(it => it.id == 3.ObjToMoney()).ToList();
var r6 = db.Queryable<InsertTest>().Where(it => it.v1 == par2.Trim()).ToList();
var convert1 = db.Queryable<Student>().Where(c => c.name == "a".ToString()).ToList();
var convert2 = db.Queryable<Student>().Where(c => c.id == Convert.ToInt32("1")).ToList();
var convert3 = db.Queryable<Student>().Where(c => c.name == par2.ToLower()).ToList();
var convert4 = db.Queryable<Student>().Where(c => c.name == par2.ToUpper()).ToList();
var convert5= db.Queryable<Student>().Where(c => DateTime.Now > Convert.ToDateTime("2015-1-1")).ToList();
var c1 = db.Queryable<Student>().Where(c => c.name.Contains("a")).ToList();
var c2 = db.Queryable<Student>().Where(c => c.name.StartsWith("a")).ToList();
var c3 = db.Queryable<Student>().Where(c => c.name.EndsWith("a")).ToList();
var c4 = db.Queryable<Student>().Where(c => !string.IsNullOrEmpty(c.name)).ToList();
var c5 = db.Queryable<Student>().Where(c => c.name.Equals("小杰")).ToList();
var c6 = db.Queryable<Student>().Where(c => c.name.Length > 4).ToList();
var time = db.Queryable<InsertTest>().Where(c => c.d1>DateTime.Now.AddDays(1)).ToList();
var time2 = db.Queryable<InsertTest>().Where(c => c.d1 > DateTime.Now.AddYears(1)).ToList();
var time3 = db.Queryable<InsertTest>().Where(c => c.d1 > DateTime.Now.AddMonths(1)).ToList();
2. SqlQuery 原生SQL查询
//转成list
List<Student> list1 = db.SqlQuery<Student>("select * from Student");
//转成list带参
List<Student> list2 = db.SqlQuery<Student>("select * from Student where id=@id", new { id = 1 });
//转成dynamic
dynamic list3 = db.SqlQueryDynamic("select * from student");
//转成json
string list4 = db.SqlQueryJson("select * from student");
//返回int
var list5 = db.SqlQuery<int>("select id from Student limit 0,1").SingleOrDefault();
//反回键值
Dictionary<string, string> list6 = db.SqlQuery<KeyValuePair<string, string>>("select id,name from Student").ToDictionary(it => it.Key, it => it.Value);
//反回List<string[]>
var list7 = db.SqlQuery<string[]>("select id,name from Student limit 0,1").SingleOrDefault();
//存储过程
//var spResult = db.SqlQuery<School>("exec sp_school @p1,@p2", new { p1 = 1, p2 = 2 });
//存储过程加Output
//var pars = SqlSugarTool.GetParameters(new { p1 = 1,p2=0 }); //将匿名对象转成SqlParameter
//db.IsClearParameters = false;//禁止清除参数
//pars[1].Direction = ParameterDirection.Output; //将p2设为 output
//var spResult2 = db.SqlQuery<School>("exec sp_school @p1,@p2 output", pars);
//db.IsClearParameters = true;//启用清除参数
//var outPutValue = pars[1].Value;//获取output @p2的值
////存储过程优化操作
//var pars2 = SqlSugarTool.GetParameters(new { p1 = 1, p2 = 0 }); //将匿名对象转成SqlParameter
//db.CommandType = CommandType.StoredProcedure;//指定为存储过程可比上面少写EXEC和参数
//var spResult3 = db.SqlQuery<School>("sp_school", pars2);
//db.CommandType = CommandType.Text;//还原回默认
//获取第一行第一列的值
string v1 = db.GetString("select ‘张三‘ as name");
int v2 = db.GetInt("select 1 as name");
double v3 = db.GetDouble("select 1 as name");
decimal v4 = db.GetDecimal("select 1 as name");
3.Sqlable 高级SQL拼接器
//多表查询 List<School> dataList = db.Sqlable() .From("school", "s") .Join("student", "st", "st.id", "s.id", JoinType.INNER) .Join("student", "st2", "st2.id", "st.id", JoinType.LEFT) .Where("s.id>100 and s.id<@id") .Where("1=1")//可以多个WHERE .OrderBy("id") .SelectToList<School/*新的Model我这里没有所以写的School*/>("st.*", new { id = 1 }); //多表分页 List<School> dataPageList = db.Sqlable() .From("school", "s") .Join("student", "st", "st.id", "s.id", JoinType.INNER) .Join("student", "st2", "st2.id", "st.id", JoinType.LEFT) .Where("s.id>100 and s.id<100") .SelectToPageList<School>("st.*", "s.id", 1, 10); //多表分页WHERE加子查询 List<School> dataPageList2 = db.Sqlable() .From("school", "s") .Join("student", "st", "st.id", "s.id", JoinType.INNER) .Join("student", "st2", "st2.id", "st.id", JoinType.LEFT) .Where("s.id>100 and s.id<100 and s.id in (select 1 )" /*这里面写子查询都可以*/) .SelectToPageList<School>("st.*", "s.id", 1, 10); //--------转成List Dynmaic 或者 Json-----// //不分页 var list1 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToDynamic("*", new { id = 1 }); var list2 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToJson("*", new { id = 1 }); var list3 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToDataTable("*", new { id = 1 }); //分页 var list4 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToPageDynamic("s.*", "l.id", 1, 10, new { id = 1 }); var list5 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToPageTable("s.*", "l.id", 1, 10, new { id = 1 }); var list6 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToPageDynamic("s.*", "l.id", 1, 10, new { id = 1 }); //--------拼接-----// Sqlable sable = db.Sqlable().From<Student>("s").Join<School>("l", "s.sch_id", "l.id", JoinType.INNER); string name = "a"; int id = 1; if (!string.IsNullOrEmpty(name)) { sable = sable.Where("s.name=@name"); } if (!string.IsNullOrEmpty(name)) { sable = sable.Where("s.id=@id or s.id=100"); } if (id > 0) { sable = sable.Where("l.id in(1)");//where加子查询 } var pars = new { id = id, name = name }; int pageCount = sable.Count(pars); var list7 = sable.SelectToPageList<Student>("s.*", "l.id desc", 1, 20, pars);View Code
支持了高性能批量插入，让你事办功倍
db.Insert(GetInsertItem()); //插入一条记录 (有主键也好，没主键也好，有自增列也好都可以插进去) db.InsertRange(GetInsertList()); //批量插入 支持（别名表等功能） db.SqlBulkCopy(GetInsertList()); //批量插入 适合海量数据插入 //设置不插入列 db.DisableInsertColumns = new string[] { "sex" };//sex列将不会插入值 Student s = new Student() { name = "张" + new Random().Next(1, int.MaxValue), sex = "gril" }; var id = db.Insert(s); //插入 //查询刚插入的sex是否有值 var sex = db.Queryable<Student>().Single(it => it.id == id.ObjToInt()).sex;//无值 var name = db.Queryable<Student>().Single(it => it.id == id.ObjToInt()).name;//有值 //SqlBulkCopy同样支持不挺入列设置 db.SqlBulkCopy(GetInsertList());
//指定列更新 db.Update<School>(new { name = "蓝翔14" }, it => it.id == 14); //只更新name列 db.Update<School, int>(new { name = "蓝翔11 23 12", areaId = 2 }, 11, 23, 12); db.Update<School, string>(new { name = "蓝翔2" }, new string[] { "11", "21" }); db.Update<School>(new { name = "蓝翔2" }, it => it.id == 100); var array=new int[]{1,2,3}; db.Update<School>(new { name = "蓝翔2" }, it => array.Contains(it.id));// id in 1,2,3 //支持字典更新，适合动态权限 var dic = new Dictionary<string, string>(); dic.Add("name", "第十三条"); dic.Add("areaId", "1"); db.Update<School, int>(dic, 13); //整个实体更新 db.Update(new School { id = 16, name = "蓝翔16", AreaId = 1 }); db.Update<School>(new School { id = 12, name = "蓝翔12", AreaId = 2 }, it => it.id == 18); db.Update<School>(new School() { id = 11, name = "青鸟11" }); //设置不更新列 db.DisableUpdateColumns = new string[] { "CreateTime" };//设置CreateTime不更新 TestUpdateColumns updObj = new TestUpdateColumns() { VGUID = Guid.Parse("542b5a27-6984-47c7-a8ee-359e483c8470"), Name = "xx", Name2 = "xx2", IdentityField = 0, CreateTime = null }; //CreateTime将不会被更新 db.Update(updObj); //以前实现这种更新需要用指定列的方式实现，现在就简单多了。 //批量更新 数据量小时建议使用 var updateResult = db.UpdateRange(GetUpdateList()); //批量更新 数据量大时建议使用 var updateResult2 = db.SqlBulkReplace(GetUpdateList2());
//删除根据主键 db.Delete<School, int>(10); //删除根据表达示 db.Delete<School>(it => it.id > 100);//支持it=>array.contains(it.id) //主键批量删除 db.Delete<School, string>(new string[] { "100", "101", "102" }); //非主键批量删除 db.Delete<School, string>(it => it.name, new string[] { "" }); db.Delete<School, int>(it => it.id, new int[] { 20, 22 }); //根据实体赋值实体一定要有主键，并且要有值。 db.Delete(new School() { id = 200 }); //根据字符串删除 db.Delete<School>("id=@id", new { id = 100 }); //假删除 //db.FalseDelete<school>("is_del", 100); //等同于 update school set is_del=1 where id in(100) //db.FalseDelete<school>("is_del", it=>it.id==100);
var stuList = db.Queryable<Student>().ToList(); db.Insert<Student>(new Student() { sch_id = SchoolEnum.北大青鸟 }); db.Update<Student>(new Student() { sch_id = SchoolEnum.it清华, id = 11 }); var stuList2 = db.Queryable<Student>().Where(it => it.sch_id == SchoolEnum.全智).ToList();View Code
View Code
使用T4
详细教程：
http://www.cnblogs.com/sunkaixuan/p/5751503.html
var r1 = db.GetDataTable("select * from student"); var r2 = db.GetSingle<Student>("select * from student LIMIT 0,1"); var r3 = db.GetScalar("select count(1) from student"); var r4 = db.GetReader("select count(1) from student"); r4.Dispose(); var r5 = db.GetString("select name from student LIMIT 0,1"); var r6 = db.ExecuteCommand("select 1"); //参数支持 var p1 = db.GetDataTable("select * from student where id=@id", new {id=1 }); var p2 = db.GetDataTable("select * from student where id=@id", new Dictionary<string, object>() { { "id", "1" } });//目前只支持 Dictionary<string, object>和Dictionary<string, string> var p3 = db.GetDataTable("select * from student where id=@id", new MySqlParameter("@id",1) );
using System; using System.Collections.Generic; using System.Linq; using System.Text; using NewTest.Dao; using Models; using System.Data.SqlClient; using MySqlSugar; namespace NewTest.Demos { //日志记录功能 public class Log : IDemos { public void Init() { Console.WriteLine("启动Log.Init"); using (var db = SugarDemoDao.GetInstance()) { var a1 = db.Queryable<Student>().Where(it => it.id == 1).ToList(); var a2 = db.Queryable<Student>().OrderBy(it => it.id).ToList(); } } public class SugarConfigs { public static Action<string, string> LogEventStarting = (sql, pars) => { Console.WriteLine("starting:" + sql + " " + pars); using (var db = SugarDemoDao.GetInstance()) { //日志记录件事件里面用到数据库操作 IsEnableLogEvent一定要为false否则将引起死循环，并且要新开一个数据实例 像我这样写就没问题。 db.IsEnableLogEvent = false; db.ExecuteCommand("select 1"); } }; public static Action<string, string> LogEventCompleted = (sql, pars) => { Console.WriteLine("completed:" + sql + " " + pars); }; } /// <summary> /// SqlSugar /// </summary> public class SugarDemoDao { public static SqlSugarClient GetInstance() { var db = new SqlSugarClient(SugarDao.ConnectionString); db.IsEnableLogEvent = true;//启用日志事件 db.LogEventStarting = SugarConfigs.LogEventStarting; db.LogEventCompleted = SugarConfigs.LogEventCompleted; return db; } } } }
using System; using System.Collections.Generic; using System.Linq; using System.Text; using NewTest.Dao; using Models; using System.Data.SqlClient; using MySqlSugar; namespace NewTest.Demos { //别名表的功能 public class MappingTable : IDemos { public void Init() { Console.WriteLine("启动MappingTable.Init"); //单个设置 using (var db = SugarDao.GetInstance()) { var list = db.Queryable<V_Student>("Student").ToList();//查询的是 select * from student 而我的实体名称为V_Student } //全局设置 using (var db = SugarFactory.GetInstance()) { var list = db.Queryable<V_Student>().ToList();//查询的是 select * from student 而我的实体名称为V_Student } } /// <summary> /// 全局配置类 /// </summary> public class SugarConfigs { //key类名 value表名 public static List<KeyValue> MpList = new List<KeyValue>(){
