IBatis.Net学习笔记三--两种常用的DAO

在IBatis中我们可以灵活的选择DAO类型，也就是可以在底层选用不同的数据库操作方式。有常规方式、配置文件的方式、Hibernet的方式等：
1、常规方式
和我们之前的ADO.NET开发较为类似，都是将sql语句写在cs代码中进行调用：
首先通过配置文件初始化：

            DomDaoManagerBuilder builder  =   new  DomDaoManagerBuilder();
            builder.Configure( " dao "   +   " _ "   +  ConfigurationManager.AppSettings[ " database " ]  +   " _ "
                 +  ConfigurationManager.AppSettings[ " providerType " ]  +   " .config " );
            daoManager  =  DaoManager.GetInstance( " SimpleDao " );        

相对应的配置文件如下：

     < context id = " SimpleDao "   default = " true " >
         < properties resource = " ../../database.config " />
        
         <!--   ====  SqlClient configuration ( default  provider)  =========      -->
         < database >
             <!--  Optional (  default  )  -->
             < provider name = " sqlServer1.1 " />
             < dataSource name = " iBatisNet "  connectionString = " data source=${datasource};database=${database};user id=${userid};password=${password};connection reset=false;connection lifetime=5; min pool size=1; max pool size=50 " />
         </ database >
        
         < daoFactory >
             < dao  interface = " IBatisNet.DataAccess.Test.Dao.Interfaces.IAccountDao, IBatisNet.DataAccess.Test "  implementation = " IBatisNet.DataAccess.Test.Dao.Implementations.Ado.AccountDao, IBatisNet.DataAccess.Test " />
         </ daoFactory >
     </ context >

然后在对应的，比如AccountDao中写具体的查询sql等

2、配置方式
将sql语句放在配置文件中，书写和修改较灵活， 这也是比较常用的方式
首先通过配置文件初始化：

            DomDaoManagerBuilder builder  =   new  DomDaoManagerBuilder();
            builder.Configure( " dao "   +   " _ "   +  ConfigurationManager.AppSettings[ " database " ]  +   " _ "
                 +  ConfigurationManager.AppSettings[ " providerType " ]  +   " .config " );
            daoManager  =  DaoManager.GetInstance( " SqlMapDao " );        

相对应的配置文件如下：

     < context id = " SqlMapDao " >
         < properties resource = " ../../database.config " />
         <!--   ====  SqlClient configuration  =========      -->
         < database >
             < dataSource name = " iBatisNet "  connectionString = " data source=${datasource};database=${database};user id=${userid};password=${password};connection reset=false;connection lifetime=5; min pool size=1; max pool size=50 " />
         </ database >         
        
         < daoSessionHandler id = " SqlMap " >
             <!--               -->
             < property name = " resource "  value = " SqlMap_MSSQL_SqlClient.config " />

             <!--   < property name = " url "  value = " E:\Projet\iBatis\trunk\cs\mapper\IBatisNet.DataAccess.Test\bin\Debug\SqlMap_MSSQL_SqlClient.config " />
             -->
             <!--  
             < property name = " embedded "  value = " bin.Debug.SqlMap_MSSQL_SqlClient.config, IBatisNet.DataAccess.Test " />  
             -->
         </ daoSessionHandler >
        
         < daoFactory >
             < dao  interface = " IBatisNet.DataAccess.Test.Dao.Interfaces.IAccountDao, IBatisNet.DataAccess.Test "  implementation = " IBatisNet.DataAccess.Test.Dao.Implementations.DataMapper.AccountDao, IBatisNet.DataAccess.Test " />
         </ daoFactory >
     </ context >

然后可以将每一张表的sql语句单独放在一个配置文件中，比如：

         < select id = " GetAccountsDynamic "  resultMap = " account-result "  parameterClass = " Hashtable "   >
            select top $MaximumAllowed$  *  from Accounts
             < dynamic prepend = " where " >
                     < isParameterPresent >
                     < isNotEmpty prepend = " and "  property = " FirstName "   >
                            Account_FirstName LIKE  ' %$FirstName$% '
                     </ isNotEmpty >
                     < isNotEmpty prepend = " and "  property = " LastName "   >
                            Account_LastName LIKE  ' %$LastName$% '
                     </ isNotEmpty >
                     < isNotEmpty prepend = " and "  property = " EmailAddress "    >
                            Account_Email LIKE  ' %$EmailAddress$% '
                     </ isNotEmpty >
                     </ isParameterPresent >
                 </ dynamic >
                order by Account_LastName
         </ select >

3、使用Hibernet方式
也就是使用Hibernet的数据库操作。