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。