SqlSugar 使用示例

爱被打了一巴掌 2021-06-26 16:06 1608阅读 0赞

# Instance SqlSugar object #

using(var db = new SqlSugarClient(ConnectionString)){ 
    
    	//use object
    	var list=db.Queryable<T>().ToList();
    	
    }

# Package instance #

/// <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;
    	}
    }

##### Use SugarDao #####

using (var db = SugarDao.GetInstance())
    { 
    	var list=db.Queryable<T>().ToList();
    }

# 1.Select #

##### 1.1 `queryable` #####

//select all
    var student = db.Queryable<Student>().ToList();
    var studentDynamic = db.Queryable<Student>().ToDynamic();
    var studentJson = db.Queryable<Student>().ToJson();
    
    
    //select single
    var single = db.Queryable<Student>().Single(c => c.id == 1);
    //select single by primarykey
    var singleByPk = db.Queryable<Student>().InSingle(1);
    //select single or default
    var singleOrDefault = db.Queryable<Student>().SingleOrDefault(c => c.id == 11111111);
    //select single or default
    var single2 = db.Queryable<Student>().Where(c => c.id == 1).SingleOrDefault();
    
    //select first
    var first = db.Queryable<Student>().Where(c => c.id == 1).First();
    var first2 = db.Queryable<Student>().Where(c => c.id == 1).FirstOrDefault();
    
    //between 11 and 20
    var page1 = db.Queryable<Student>().Where(c => c.id > 10).OrderBy(it => it.id).Skip(10).Take(10).ToList();
    
    //between 11 and 20 
    var page2 = db.Queryable<Student>().Where(c => c.id > 10).OrderBy(it => it.id).ToPageList(2, 10);
    
    //get count
    var count = db.Queryable<Student>().Where(c => c.id > 10).Count();
    
    //skip 2
    var skip = db.Queryable<Student>().Where(c => c.id > 10).OrderBy(it => it.id).Skip(2).ToList();
    
    //take 2
    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();
    
    //where sql string
    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();
    
    
    //is any
    bool isAny100 = db.Queryable<Student>().Any(c => c.id == 100);
    bool isAny1 = db.Queryable<Student>().Any(c => c.id == 1);
    
    
    //get max id
    object maxId = db.Queryable<Student>().Max(it => it.id);
    int maxId1 = db.Queryable<Student>().Max(it => it.id).ObjToInt();
    int maxId2 = db.Queryable<Student>().Max<int>("id"); 
    
    //get min id
    int minId1 = db.Queryable<Student>().Where(c => c.id > 0).Min(it => it.id).ObjToInt();
    int minId2 = db.Queryable<Student>().Where(c => c.id > 0).Min<int>("id");
    
    
    //order By 
    var orderList = db.Queryable<Student>().OrderBy("id desc,name asc").ToList();
    //order by 
    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(); //in primary fileds
    
    //group by
    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
    
    
    
    //join
    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();
    
    /*join sql SELECT s1.*,s2.name as schName FROM [Student] s1 LEFT JOIN [School] s2 ON s1.sch_id = s2.id WHERE s1.id = 1 */
    
    //join and page
    var jList2 = db.Queryable<Student>()
    	.JoinTable<School>((s1, s2) => s1.sch_id == s2.id) //默认left join
    	//left inner join 
    	//.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();
    
    //join three tables
    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) 
    	.Skip(10)
    	.Take(20)
    	.Select("s1.*,s2.name as schName,s3.name as schName2")//select string
    	.ToDynamic();
    
    
    //join five
    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 
    		.JoinTable<Area, School>((s1, a1, s3) => a1.id == s3.AreaId)// left join School s3 on a1.id=s3.AreaId 
    			.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();
    
    //join five sql
    //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 ) 
    //LEFT JOIN School s3 ON ( a1.id = s3.AreaId ) 
    //LEFT JOIN School s4 ON ( s1.sch_id = s4.id ) 
    //WHERE 1=1 
    
    
    //Join child
    var childQuery = db.Queryable<Area>().Where("id=@id").Select(it => new {  id = it.id }).ToSql();//create child SQL
    string childTableName =SqlSugarTool.PackagingSQL(childQuery.Key);//package sql
    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();
    
    
    //append queryable
    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 SqlSugarClient 
    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();
    
    
    //get sql和 pars
    var id = 1;
    var sqlAndPars = db.Queryable<Student>().Where(it => it.id == id).OrderBy(it => it.id).ToSql();
    
    
    
    //express functions
    var par1 = "2015-1-1"; var par2 = " I have a trim ";
    var r1 = db.Queryable<Student>().Where(it => it.name == par1.ObjToString()).ToList(); //ObjToString if null return ""
    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 if null return 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();
    var intList = intArray.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();
    
    //group by
    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<SexTotal> list5 = db.Queryable<Student>().Where(c => c.id < 20).GroupBy(it => it.sex).Select<Student, SexTotal>("Sex,Count=count(*)").ToList();
    List<SexTotal> list6 = db.Queryable<Student>().Where(c => c.id < 20).GroupBy("sex").Select<Student, SexTotal>    ("Sex,Count=count(*)").ToList();
    //SELECT Sex,Count=count(*) FROM Student WHERE 1=1 AND (id < 20) GROUP BY Sex 
    
    
    //join
    var jList = db.Queryable<Student>()
    	.JoinTable<Student, School>((s1, s2) => s1.sch_id == s2.id) //detault left join
    		.Where<Student, School>((s1, s2) => s1.id == 1)
    			.Select("s1.*,s2.name as schName")
    			.ToDynamic();
    
    //join by page
    var jList2 = db.Queryable<Student>()
    	.JoinTable<Student, School>((s1, s2) => s1.sch_id == s2.id) //default left join
    		//inner join
    		//.JoinTable<Student, School>((s1, s2) => s1.sch_id == s2.id ,JoinType.INNER)
    		.Where<Student, School>((s1, s2) => s1.id > 1)
    			.OrderBy<Student, School>((s1, s2) => s1.name)
    				.Skip(10)
    				.Take(20)
    				.Select("s1.*,s2.name as schName")
    				.ToDynamic();
    
    //join select new 
    var jList3 = db.Queryable<Student>()
    	.JoinTable<Student, School>((s1, s2) => s1.sch_id == s2.id) // left join School s2 on s1.id=s2.id
    		.Where<Student, School>((s1, s2) => s1.id > 1)  // where s1.id>1
    			.OrderBy<Student, School>((s1, s2) => s1.id) //order by s1.id no one ordder .oderBy().orderby 
    				.Skip(1)
    				.Take(2)
    				.Select<Student, School, classNew>((s1, s2) => new classNew() {  newid = s1.id, newname = s2.name, xx_name = s1.name }) 
    					.ToList();

1.2 `SqlQuery`

//to list
    List<Student> list1 = db.SqlQuery<Student>("select * from Student");
    //to list with par
    List<Student> list2 = db.SqlQuery<Student>("select * from Student where id=@id", new {  id = 1 });
    //to dynamic
    dynamic list3 = db.SqlQueryDynamic("select * from student");
    //to json
    string list4 = db.SqlQueryJson("select * from student");
    //get int
    var list5 = db.SqlQuery<int>("select top 1 id from Student").SingleOrDefault();
    //get dictionary
    Dictionary<string, string> list6 = db.SqlQuery<KeyValuePair<string, string>>("select id,name from Student").ToDictionary(it => it.Key, it => it.Value);
    //get List<string[]>
    var list7 = db.SqlQuery<string[]>("select top 1 id,name from Student").SingleOrDefault();
    //get sp result
    var spResult = db.SqlQuery<School>("exec sp_school @p1,@p2", new {  p1 = 1, p2 = 2 });
    
    //get sp and output 
    var pars = SqlSugarTool.GetParameters(new {  p1 = 1,p2=0 }); //dynmaic to SqlParameter
    db.IsClearParameters = false;//close clear parametrs
    pars[1].Direction = ParameterDirection.Output; //set output
    var spResult2 = db.SqlQuery<School>("exec sp_school @p1,@p2 output", pars);
    db.IsClearParameters = true;//open clear parameters
    var outPutValue = pars[1].Value;//get output @p2 value
    
    //sp 
    var pars2 = SqlSugarTool.GetParameters(new {  p1 = 1, p2 = 0 }); 
    db.CommandType = CommandType.StoredProcedure;
    var spResult3 = db.SqlQuery<School>("sp_school", pars2);
    db.CommandType = CommandType.Text;
    
    
    //get first row first column
    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");
    //....

##### 1.3 Sqlable #####

//join
    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")
    	.OrderBy("id")
    	.SelectToList<School/*new model*/>("st.*", new {  id = 1 });
    
    //join page
    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);
    
    //page where
    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 )" )
    	.SelectToPageList<School>("st.*", "s.id", 1, 10);
    
    
    
    //-------- Dynmaic OR Json-----//
    
    //join
    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 });
    
    //page
    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 });
    
    
    //--------append sqlable-----//
    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 (select top 10 id from school)");
    }
    var pars = new {  id = id, name = name };
    int pageCount = sable.Count(pars);
    var list7 = sable.SelectToPageList<Student>("s.*", "l.id desc", 1, 20, pars);

# 2.`Insert` #

//insert item
    db.Insert(GetInsertItem());  
    
    //insert list
    db.InsertRange(GetInsertList()); 
    
    //insert list (so fast)
    db.SqlBulkCopy(GetInsertList()); 
    
    
    //setting disable insert columns
    db.DisableInsertColumns = new string[] {  "sex" };
    Student s = new Student()
    { 
    	name = "mr" + new Random().Next(1, int.MaxValue),
    	sex = "gril"
    };
    
    var id = db.Insert(s); // insert with no 【sex】

# 3.`Update` #

//update specified column
    db.Update<School>(new {  name = "蓝翔14" }, it => it.id == 14); //only update name
    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
    
    //update list by enity primary key
    var updateResult = db.UpdateRange(GetUpdateList());a
    
    //update list by enity primary key (so fast)
    var updateResult2 = db.SqlBulkReplace(GetUpdateList2());
    
    //update by dictionary
    var dic = new Dictionary<string, string>();
    dic.Add("name", "第十三条");
    dic.Add("areaId", "1");
    db.Update<School, int>(dic, 13);
    
    
    //update by entity
    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" });
    
    //settig disable Update Columns
    db.DisableUpdateColumns = new string[] {  "CreateTime" };//CreateTime no update
    
    TestUpdateColumns updObj = new TestUpdateColumns()
    { 
    	VGUID = Guid.Parse("542b5a27-6984-47c7-a8ee-359e483c8470"),
    	Name = "xx",
    	Name2 = "xx2",
    	IdentityField = 0,
    	CreateTime = null
    };
    
    db.Update(updObj);

# 4.`Delete` #

//delete by primary key
    db.Delete<School, int>(10);
    
    //delete by exp
    db.Delete<School>(it => it.id > 100);//support it=>array.contains(it.id)
    
    //delete by primary key values
    db.Delete<School, string>(new string[] {  "100", "101", "102" });
    
    //delete by field values
    db.Delete<School, string>(it => it.name, new string[] {  "" });
    db.Delete<School, int>(it => it.id, new int[] {  20, 22 });
    
    
    //delete by entity
    db.Delete(new School() {  id = 200 });
    
    //delete by sql where string
    db.Delete<School>("id=@id", new {  id = 100 });
    
    //false delete
    //db.FalseDelete<school>("is_del", 100);
    //sql: update school set is_del=1 where id in(100)
    //db.FalseDelete<school>("is_del", it=>it.id==100);

# 5.`Tran` #

using (SqlSugarClient db = SugarDao.GetInstance())
    { 
    	db.IsNoLock = true; 
    	db.CommandTimeOut = 30000; 
    	try
    	{ 
    		db.BeginTran();
    		//db.BeginTran(IsolationLevel.ReadCommitted);+3
    
    		db.CommitTran();
    	}
    	catch (Exception)
    	{ 
    		db.RollbackTran();
    		throw;
    	}
    }

# 6.Rename tables #

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>(){ 
    			new KeyValue(){  Key="FormAttr", Value="Flow_FormAttr"},
    				new KeyValue(){  Key="Student3", Value="Student"},
    				new KeyValue(){  Key="V_Student", Value="Student"}
    		};
    	}
    
    	/// <summary>
    	/// SqlSugar实例工厂
    	/// </summary>
    	public class SugarFactory
    	{ 
    
    		//禁止实例化
    		private SugarFactory()
    		{ 
    
    		}
    		public static SqlSugarClient GetInstance()
    		{ 
    			string connection = SugarDao.ConnectionString; //这里可以动态根据cookies或session实现多库切换
    			var db = new SqlSugarClient(connection);
    
    			db.SetMappingTables(SugarConfigs.MpList);//设置关联表 (引用地址赋值，每次赋值都只是存储一个内存地址)
    
    
    
    			//批量设置别名表
    			//db.ClassGenerating.ForeachTables(db, tableName =>
    			//{ 
    			// db.AddMappingTable(new KeyValue() { Key = tableName.Replace("bbs.",""), Value = tableName }); //key实体名，value表名
    			//});
    
    
    			return db;
    		}
    	}
    }

# 7.Rename Columns #

//别名列的功能
    public class MappingColumns : IDemos
    { 
    
    	public void Init()
    	{ 
    		Console.WriteLine("启动MappingColumns.Init");
    
    		//全局设置
    		using (var db = SugarFactory.GetInstance())
    		{ 
    			var list = db.Queryable<Student>().Where(it=>it.classId==1).ToList();
    		}
    	}
    
    	public class Student
    	{ 
    
    		//id
    		public int classId {  get; set; }
    
    		//name
    		public string className {  get; set; }
    
    		//sch_id
    		public int classSchoolId {  get; set; }
    
    		public int isOk {  get; set; }
    	}
    
    	/// <summary>
    	/// 全局配置别名列（不区分表）
    	/// </summary>
    	public class SugarConfigs
    	{ 
    		//key实体字段名 value表字段名 ，KEY唯一否则异常
    		public static List<KeyValue> MpList = new List<KeyValue>(){ 
    			new KeyValue(){  Key="classId", Value="id"},
    				new KeyValue(){  Key="className", Value="name"},
    				new KeyValue(){  Key="classSchoolId", Value="sch_id"}
    		};
    	}
    
    	/// <summary>
    	/// SqlSugar实例工厂
    	/// </summary>
    	public class SugarFactory
    	{ 
    
    		//禁止实例化
    		private SugarFactory()
    		{ 
    
    		}
    		public static SqlSugarClient GetInstance()
    		{ 
    			string connection = SugarDao.ConnectionString; //这里可以动态根据cookies或session实现多库切换
    			var db = new SqlSugarClient(connection);
    			//注意：只有启动属性映射才可以使用SetMappingColumns
    			db.IsEnableAttributeMapping = true;
    			db.SetMappingColumns(SugarConfigs.MpList);//设置关联列 (引用地址赋值，每次赋值都只是存储一个内存地址)
    			return db;
    		}
    	}
    }

# 8.Ignore error columns #

using (var db = SugarDao.GetInstance())
    { 
    	db.IsIgnoreErrorColumns = true;
    }

# 9.Create class files #

db.ClassGenerating.CreateClassFiles(db, ("e:/TestModels"), "Models");