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README.md
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README.md
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# SqlSugar 4.X
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##Query Demo
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```c
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public class Query
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{
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public static void Init()
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{
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Easy();
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Page();
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Where();
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Join();
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Funs();
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Select();
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Ado();
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Group();
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Sqlable();
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}
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private static void Group()
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{
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var db = GetInstance();
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var list = db.Queryable<Student>()
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.GroupBy(it => it.Name)
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.GroupBy(it => it.Id).Having(it => NBORM.AggregateAvg(it.Id) > 0)
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.Select(it => new { idAvg = NBORM.AggregateAvg(it.Id), name = it.Name }).ToList();
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//SQL:
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//SELECT AVG([Id]) AS[idAvg], [Name] AS[name] FROM[Student] GROUP BY[Name],[Id] HAVING(AVG([Id]) > 0 )
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//NBORM.AggregateSum(object thisValue)
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//NBORM.AggregateAvg<TResult>(TResult thisValue)
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//NBORM.AggregateMin(object thisValue)
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//NBORM.AggregateMax(object thisValue)
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//NBORM.AggregateCount(object thisValue)
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}
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private static void Ado()
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{
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var db = GetInstance();
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var t1= db.Ado.SqlQuery<string>("select 'a'");
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var t2 = db.Ado.GetInt("select 1");
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var t3 = db.Ado.GetDataTable("select 1 as id");
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//more
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//db.Ado.GetXXX...
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}
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public static void Easy()
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{
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var db = GetInstance();
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var getAll = db.Queryable<Student>().ToList();
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var getAllNoLock = db.Queryable<Student>().With(SqlWith.NoLock).ToList();
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var getByPrimaryKey = db.Queryable<Student>().InSingle(2);
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var getByWhere = db.Queryable<Student>().Where(it => it.Id == 1 || it.Name == "a").ToList();
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var getByFuns = db.Queryable<Student>().Where(it => NBORM.IsNullOrEmpty(it.Name)).ToList();
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}
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public static void Page()
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{
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var db = GetInstance();
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var pageIndex = 1;
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var pageSize = 2;
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var totalCount = 0;
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var page = db.Queryable<Student>().ToPageList(pageIndex, pageSize, ref totalCount);
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var pageJoin = db.Queryable<Student, School>((st, sc) => new object[] {
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JoinType.Left,st.SchoolId==sc.Id
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}).ToPageList(pageIndex, pageSize, ref totalCount);
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//top 5
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var top5 = db.Queryable<Student>().Take(5).ToList();
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//skip5
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var skip5 = db.Queryable<Student>().Skip(5).ToList();
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}
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public static void Where()
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{
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var db = GetInstance();
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//join
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var list = db.Queryable<Student, School>((st, sc) => new object[] {
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JoinType.Left,st.SchoolId==sc.Id
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})
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.Where<School>(sc => sc.Id == 1)
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.Where<Student>(st => st.Id == 1)
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.Where<Student, School>((st, sc) => st.Id == 1 && sc.Id == 2).ToList();
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//SELECT [st].[Id],[st].[SchoolId],[st].[Name],[st].[CreateTime] FROM [Student] st
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//Left JOIN School sc ON ( [st].[SchoolId] = [sc].[Id] )
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//WHERE ( [sc].[Id] = @Id0 ) AND ( [st].[Id] = @Id1 ) AND (( [st].[Id] = @Id2 ) AND ( [sc].[Id] = @Id3 ))
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//Where If
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string name = null;
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string name2 = "sunkaixuan";
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var list2 = db.Queryable<Student>()
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.WhereIF(!string.IsNullOrEmpty(name), it => it.Name == name)
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.WhereIF(!string.IsNullOrEmpty(name2), it => it.Name == name2).ToList();
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}
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public static void Join()
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{
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var db = GetInstance();
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//join 2
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var list = db.Queryable<Student, School>((st, sc) => new object[] {
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JoinType.Left,st.SchoolId==sc.Id
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}).ToList();
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//join 3
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var list2 = db.Queryable<Student, School,Student>((st, sc,st2) => new object[] {
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JoinType.Left,st.SchoolId==sc.Id,
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JoinType.Left,st.SchoolId==st2.Id
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}).ToList();
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//join return List<ViewModelStudent>
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var list3 = db.Queryable<Student, School>((st, sc) => new object[] {
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JoinType.Left,st.SchoolId==sc.Id
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}).Select<Student,School,ViewModelStudent>((st,sc)=>new ViewModelStudent { Name= st.Name,SchoolId=sc.Id }).ToList();
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//join Order By (order by st.id desc,sc.id desc)
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var list4 = db.Queryable<Student, School>((st, sc) => new object[] {
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JoinType.Left,st.SchoolId==sc.Id
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})
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.OrderBy(st=>st.Id,OrderByType.Desc)
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.OrderBy<School>(sc=>sc.Id,OrderByType.Desc)
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.Select<Student, School, ViewModelStudent>((st, sc) => new ViewModelStudent { Name = st.Name, SchoolId = sc.Id }).ToList();
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}
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public static void Funs()
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{
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var db = GetInstance();
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var t1 = db.Queryable<Student>().Where(it => NBORM.ToLower(it.Name) == NBORM.ToLower("JACK")).ToList();
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//SELECT [Id],[SchoolId],[Name],[CreateTime] FROM [Student] WHERE ((LOWER([Name])) = (LOWER(@MethodConst0)) )
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/***More Functions***/
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//NBORM.IsNullOrEmpty(object thisValue)
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//NBORM.ToLower(object thisValue)
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//NBORM.string ToUpper(object thisValue)
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//NBORM.string Trim(object thisValue)
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//NBORM.bool Contains(string thisValue, string parameterValue)
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//NBORM.ContainsArray(object[] thisValue, string parameterValue)
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//NBORM.StartsWith(object thisValue, string parameterValue)
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//NBORM.EndsWith(object thisValue, string parameterValue)
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//NBORM.Equals(object thisValue, object parameterValue)
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//NBORM.DateIsSame(DateTime date1, DateTime date2)
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//NBORM.DateIsSame(DateTime date1, DateTime date2, DateType dataType)
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//NBORM.DateAdd(DateTime date, int addValue, DateType millisecond)
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//NBORM.DateAdd(DateTime date, int addValue)
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//NBORM.DateValue(DateTime date, DateType dataType)
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//NBORM.Between(object value, object start, object end)
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//NBORM.ToInt32(object value)
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//NBORM.ToInt64(object value)
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//NBORM.ToDate(object value)
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//NBORM.ToString(object value)
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//NBORM.ToDecimal(object value)
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//NBORM.ToGuid(object value)
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//NBORM.ToDouble(object value)
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//NBORM.ToBool(object value)
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//NBORM.Substring(object value, int index, int length)
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//NBORM.Replace(object value, string oldChar, string newChar)
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//NBORM.Length(object value) { throw new NotImplementedException(); }
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//NBORM.AggregateSum(object thisValue)
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//NBORM.AggregateAvg<TResult>(TResult thisValue)
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//NBORM.AggregateMin(object thisValue)
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//NBORM.AggregateMax(object thisValue)
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//NBORM.AggregateCount(object thisValue)
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}
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public static void Select()
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{
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var db = GetInstance();
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db.IgnoreColumns.Add("TestId", "Student");
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var s1 = db.Queryable<Student>().Select(it => new ViewModelStudent2 { Name = it.Name, Student = it }).ToList();
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var s2 = db.Queryable<Student>().Select(it => new { id = it.Id, w = new { x = it } }).ToList();
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var s3 = db.Queryable<Student>().Select(it => new { newid = it.Id }).ToList();
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var s4 = db.Queryable<Student>().Select(it => new { newid = it.Id, obj = it }).ToList();
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var s5 = db.Queryable<Student>().Select(it => new ViewModelStudent2 { Student = it, Name = it.Name }).ToList();
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}
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private static void Sqlable()
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{
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var db = GetInstance();
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var join3 = db.Queryable("Student", "st")
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.AddJoinInfo("School", "sh", "sh.id=st.schoolid")
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.Where("st.id>@id")
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.AddParameters(new { id = 1 })
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.Select("st.*").ToList();
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//SELECT st.* FROM [Student] st Left JOIN School sh ON sh.id=st.schoolid WHERE st.id>@id
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}
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public static SqlSugarClient GetInstance()
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{
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SqlSugarClient db = new SqlSugarClient(new SystemTableConfig() { ConnectionString = Config.ConnectionString, DbType = DbType.SqlServer, IsAutoCloseConnection = true });
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db.Ado.IsEnableLogEvent = true;
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db.Ado.LogEventStarting = (sql, pars) =>
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{
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Console.WriteLine(sql + "\r\n" + db.RewritableMethods.SerializeObject(pars));
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Console.WriteLine();
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};
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return db;
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}
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}
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```
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