Moon.Orm 5.0 (MQL版) 欣赏另一种Orm的设计风格----大道至简

Moon.Orm 5.0(MQL版)使用指南(二)

一、使用sql及存储过程

1)使用List<Dictionary<string, MObject>>

1.使用sql ,体验原生态的感觉

string sql= "select * from Class where ClassName = @";
string sql2= "select * from Class where DateTimem = @";
List<Dictionary< string, MObject>> mylist=db. ExecuteSqlToDictionaryList(sql, "boy'");
List<Dictionary< string, MObject>> mylist2=db. ExecuteSqlToDictionaryList(sql2,DateTime. Parse( "2013-10-10 14:40:08"));

foreach( var oneClass  in mylist){
                     string className=oneClass[ "className"].To< string>();
                     long id=oneClass[ "Classid"].To< long>();
                    DateTime datetimem=oneClass[ "datetimem"].To<DateTime>();//不用区分大小写
                    Console. WriteLine(className+ "  "+id+ "  "+datetimem);
}

2.使用mql,智能感知带来的优雅体验

var  list=db. GetDictionaryList(ClassSet. SelectAll(). Where(ClassSet.ClassID. BiggerThan( 0)))

 

2)MQL 全面接触

 

2.1 MQL的标准查询

var mm=ClassSet. Select(ClassSet.ClassID,ClassSet.ClassName).

Where(ClassSet.ClassName.Contains("s").And(ClassSet.ClassID.BiggerThan(9)));

 

SELECT [Class].[ClassID],[Class].[ClassName] FROM [Class] WHERE [Class].[ClassName] LIKE @p1  AND  [Class].[ClassID]>@p2
@p1=%s%
@p2=9

2.2 MQL的嵌套查询(含有Top查询:支持mysql、oracle、postgreSQL、sqlserver、sqlite)

var qiantao=ScoreSet. SelectAll(). Where(
                    ScoreSet.UserID. In(UserSet. Select(UserSet.UserID). Where(
                        UserSet.ClassID. In(
                        ClassSet. Select(ClassSet.ClassID). Where(
                                ClassSet.ClassName. Equal(c.ClassName). And(ClassSet.ClassID. BiggerThan( 0))
                            )
                        )
                    )
                  ) 
                ). Top( 1);

  SELECT TOP 1 [Score].* FROM [Score] WHERE [Score].[UserID] IN (SELECT [User].[UserID] FROM [User] WHERE [User].[ClassID] IN (SELECT [Class].[ClassID] FROM [Class] WHERE [Class].[ClassName]=@p1  AND  [Class].[ClassID]>@p2 ) )
@p1=综合测试ClassName2
@p2=0

2.3 MQL的分组查询

var mql=ScoreSet. Select(ScoreSet.ScoreM. Sum(). AS( "sum"),ScoreSet.TypeName).

Where(ScoreSet.ScoreM.BiggerThanOrEqual(100)).

GroupBy(ScoreSet.TypeName).

Having(ScoreSet.ScoreM.Sum().BiggerThan(300));

 

SELECT SUM([Score].[ScoreM]) AS 'sum',[Score].[TypeName] FROM [Score] WHERE  [Score].[ScoreM]>=@p1  GROUP BY [Score].[TypeName]  HAVING  SUM([Score].[ScoreM])>@p2
@p1=100
@p2=300

2.4 MQL的连接查询

var m1=ClassSet. Select(ClassSet.ClassID,ClassSet.ClassName)
                    . LeftJoin(
                    UserSet. Select(UserSet.UserID))
                    . ON(ClassSet.ClassID. Equal(UserSet.UserID))
                    . Where(UserSet.UserID. BiggerThan( 9));

SELECT [Class].[ClassID],[Class].[ClassName],[User].[UserID] FROM [Class] LEFT JOIN [User] ON [Class].[ClassID]=[User].[UserID]  WHERE  [User].[UserID]>@p1
@p1=9

2.5 MQL的Union查询

var mql=ClassSet. SelectAll(). Where(ClassSet.ClassID. BiggerThan( 1))
                    . Union(ClassSet. SelectAll(). Where(ClassSet.ClassID. BiggerThan( 2)));

 

var mql=ClassSet. SelectAll(). Where(ClassSet.ClassID. BiggerThan( 1))
                    . UnionAll(ClassSet. SelectAll(). Where(ClassSet.ClassID. BiggerThan( 2)));

 

SELECT [Class].* FROM [Class] WHERE  [Class].[ClassID]>@p1  UNION  SELECT [Class].* FROM [Class] WHERE  [Class].[ClassID]>@p2
@p1=1
@p2=2

SELECT [Class].* FROM [Class] WHERE  [Class].[ClassID]>@p1  UNION ALL SELECT [Class].* FROM [Class] WHERE  [Class].[ClassID]>@p2
@p1=1
@p2=2

2.6 MQL的使用预览

public  static  void  Main( string[] args)
        {
            
             using ( var db=Db. CreateDefaultDb()) {
                db.TransactionEnabled= true;
                db.DebugEnabled= true;
                Console. WriteLine( "---------------嵌套查询---------------------");
                 var qiantao=ScoreSet. SelectAll(). Where(
                    ScoreSet.UserID. In(UserSet. Select(UserSet.UserID). Where(
                        UserSet.ClassID. In(
                        ClassSet. Select(ClassSet.ClassID). Where(
                                ClassSet.ClassName. Equal(c.ClassName). And(ClassSet.ClassID. BiggerThan( 0))
                            )
                        )
                    )
                  ) 
                ). Top( 1);
               
                Console. WriteLine( "---------------分组查询---------------------");
                 var mql=ScoreSet. Select(ScoreSet.ScoreM. Sum(). AS( "sum"),ScoreSet.TypeName). Where(ScoreSet.ScoreM. BiggerThanOrEqual( 100)). GroupBy(ScoreSet.TypeName). Having(ScoreSet.ScoreM. Sum(). BiggerThan( 300));
              
                Console. WriteLine( "---------------连接查询---------------------");
                 var m1=ClassSet. Select(ClassSet.ClassID,ClassSet.ClassName)
                    . LeftJoin(
                    UserSet. Select(UserSet.UserID))
                    . ON(ClassSet.ClassID. Equal(UserSet.UserID))
                    . Where(UserSet.UserID. BiggerThan( 9));

            }
            Console.WriteLine("---------------Union测试---------------------");
            using (var db=Db.CreateDefaultDb()) {
                db.TransactionEnabled=true;
                db.DebugEnabled=true;
                
                var mql=ClassSet.SelectAll().Where(ClassSet.ClassID.BiggerThan(1))
                    .Union(ClassSet.SelectAll().Where(ClassSet.ClassID.BiggerThan(2))); 

            }
        }

 

 

3)使用DataSet

1.使用存储过程

DataSet dataset=db. ExecuteProToDataSet( "存储过程名",参数一,参数二);

2.使用sql

DataSet dataset=db. ExecuteSqlToDataSet(sql, "boy");

3.使用mql

DataSet dataset=db. GetDataSet(ClassSet. SelectAll(). Where(ClassSet.ClassID. BiggerThan( 0)));

 

4)使用xml配置sql查询

1.配置config节点

 

<appSettings>
     <add key="SQL_XML_FILE_NAME" value="C:\Moon\Moon.Orm\sql.xml"></add>// 如果不是全路径,则默认在dll生成目录
</appSettings>

 

2.配置xml(sql.xml)

 

<?xml version="1.0"?>
<sqls>
     <sqlxml id="getname">
         <sql>select name from user where id>@ </Sql>
         <description>查询用户名(描述信息) </Description>
     </sqlxml>
</sqls>

 3.使用id进行查询

var list=db. GetDictionaryList(XmlHelper. GetSqlXmlByID( "getname"), "boy");

5)sql之王者归来

使用GetDynamicList ,让你体验另一种自由

 

object,但在.net 4.0下面,您可以用dynamic直接取值.

string sql22= "select * from Score";
dynamic list22=db. GetDynamicList(sql22, "Score");
foreach( var a  in list22){
       Console. WriteLine(a.ID+ "--"+a.ScoreM+ "--"+a.UserID+ "--"+a.TypeName);// 都是强类型
}

以下是体验强类型:)

 

 

 

 

 

 

 

 

 

 

 

 

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