准备工作
1. 下载ibatis软件包(http://ibatis.apache.org/dotnetdownloads.html)。
2. 创建测试数据库,并在数据库中创建一个Person 表,其中包含三个字段:
Name Type Size
PER_ID Long Integer 4 not null
PER_FIRST_NAME nvarchar 40 not null
PER_LAST_NAME nvarchar 40 not null
PER_BIRTH_DATE DateTime 8
PER_WEIGHT_KG float 8
PER_HEIGHT_M float 8
3. 为了在开发过程更加直观,我们需要将ibatisnet日志打开以便观察ibatinets运作的细节。
ibatisnet采用IBatisNet.Common.Logging.Log4Net,就是使用Log4Net纪录日志的包装。在Web.config中增加下面的配置内容:
<configSections>
<sectionGroupname="iBATIS">
<sectionname="logging"type="IBatisNet.Common.Logging.ConfigurationSectionHandler, IBatisNet.Common" />
</sectionGroup>
<sectionname="log4net"type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
<iBATIS>
<logging>
<logFactoryAdaptertype="IBatisNet.Common.Logging.Impl.Log4NetLoggerFA, IBatisNet.Common.Logging.Log4Net">
<argkey="configType"value="inline" />
<arg key ="showLogName" value="true" />
<arg key ="showDataTime" value="true" />
<arg key ="level" value="ALL" />
<arg key ="dateTimeFormat" value="yyyy/MM/dd HH:mm:ss:SSS" />
</logFactoryAdapter>
</logging>
</iBATIS>
<!-- This section contains the log4net configuration settings -->
<log4net>
<!-- Define some output appenders -->
<appendername="RollingLogFileAppender"type="log4net.Appender.RollingFileAppender">
<paramname="File"value="log.txt" />
<paramname="AppendToFile"value="true" />
<paramname="MaxSizeRollBackups"value="2" />
<paramname="MaximumFileSize"value="100KB" />
<paramname="RollingStyle"value="Size" />
<paramname="StaticLogFileName"value="true" />
<layouttype="log4net.Layout.PatternLayout">
<paramname="Header"value="[Header]\r\n" />
<paramname="Footer"value="[Footer]\r\n" />
<paramname="ConversionPattern"value="%d [%t] %-5p %c [%x] - %m%n" />
</layout>
</appender>
<appendername="ConsoleAppender"type="log4net.Appender.ConsoleAppender">
<layouttype="log4net.Layout.PatternLayout">
<paramname="ConversionPattern"value="%d [%t] %-5p %c [%x] <%X{auth}> - %m%n" />
</layout>
</appender>
<!-- Set root logger level to ERROR and its appenders -->
<root>
<levelvalue="DEBUG" />
<appender-refref="RollingLogFileAppender" />
<appender-refref="ConsoleAppender" />
</root>
<!-- Print only messages of level DEBUG or above in the packages -->
<loggername="IBatisNet.DataMapper.Configuration.Cache.CacheModel">
<levelvalue="DEBUG" />
</logger>
<loggername="IBatisNet.DataMapper.Configuration.Statements.PreparedStatementFactory">
<levelvalue="DEBUG" />
</logger>
<loggername="IBatisNet.DataMapper.LazyLoadList">
<levelvalue="DEBUG" />
</logger>
<loggername="IBatisNet.DataAccess.DaoSession">
<levelvalue="DEBUG" />
</logger>
<loggername="IBatisNet.DataMapper.SqlMapSession">
<levelvalue="DEBUG" />
</logger>
<loggername="IBatisNet.Common.Transaction.TransactionScope">
<levelvalue="DEBUG" />
</logger>
<loggername="IBatisNet.DataAccess.Configuration.DaoProxy">
<levelvalue="DEBUG" />
</logger>
</log4net>
构建IBatisNet基础代码
IBatisNet 基础代码包括:
1. IBatisNet 实例配置
一个典型的配置文件如下(具体配置项目的含义见后):
<?xml version="1.0" encoding="utf-8"?>
<sqlMapConfig xmlns="http://ibatis.apache.org/dataMapper" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" >
<!-- Rem : If used via a DataAccess context, properties tag will be ignored
<properties resource="../../database.config"/> -->
<properties embedded="database.config, IBatisNetDemo"/>
<settings>
<setting useStatementNamespaces="${useStatementNamespaces}"/>
<setting cacheModelsEnabled="true"/>
<setting validateSqlMap="false"/>
</settings>
<!-- Optional if resource -->
<providers embedded="providers.config,IBatisNetDemo"/>
<!-- ==== SqlClient configuration ========= -->
<!-- Rem : If used via a DataAccess context, database tag will be ignored -->
<database>
<!-- Optional ( default ) -->
<provider name="sqlServer1.1"/>
<dataSource name="iBatisNet" connectionString="data source=localhost;database=Northwind;user id=sa;password=;connection reset=false;connection lifetime=5; min pool size=1; max pool size=50"/>
</database>
<sqlMaps>
<!-- user via embedded-->
<sqlMap embedded="Map.SqlClient.Person.xml,IBatisNetDemo"/>
</sqlMaps>
</sqlMapConfig>
2. PO(Plain Ordinary Object)
下面是我们用作示例的一个PO:
[Serializable]
public class Person
{
private int id;
private string firstName;
private string lastName;
private DateTime? birthDate;
private double? weightInKilograms;
private double? heightInMeters;
public Person() { }
public int Id
{
get { return id; }
set { id = value; }
}
public string FirstName
{
get { return firstName; }
set { firstName = value; }
}
public string LastName
{
get { return lastName; }
set { lastName = value; }
}
public DateTime? BirthDate
{
get { return birthDate; }
set { birthDate = value; }
}
public double? WeightInKilograms
{
get { return weightInKilograms; }
set { weightInKilograms = value; }
}
public double? HeightInMeters
{
get { return heightInMeters; }
set { heightInMeters = value; }
}
}
3.映射文件
与Hibernate 不同。因为需要人工编写SQL 代码,IBatisNet 的映射文件一般采
用手动编写(通过Copy/Paste,手工编写映射文件也并没想象中的麻烦)。
针对上面PO 的映射代码如下:
<?xml version="1.0" encoding="utf-8" ?>
<sqlMap namespace="Person" xmlns="http://ibatis.apache.org/mapping"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" >
<alias>
<typeAlias alias="Person" type="IBatisNetDemo.Domain.Person,IBatisNetDemo" />
</alias>
<resultMaps>
<resultMap id="SelectAllResult" class="Person">
<result property="Id" column="PER_ID" />
<result property="FirstName" column="PER_FIRST_NAME" />
<result property="LastName" column="PER_LAST_NAME" />
<result property="BirthDate" column="PER_BIRTH_DATE" />
<result property="WeightInKilograms" column="PER_WEIGHT_KG" />
<result property="HeightInMeters" column="PER_HEIGHT_M" />
</resultMap>
</resultMaps>
<statements>
<select id="SelectAllPerson" resultMap="SelectAllResult">
select
PER_ID,
PER_FIRST_NAME,
PER_LAST_NAME,
PER_BIRTH_DATE,
PER_WEIGHT_KG,
PER_HEIGHT_M
from PERSON
</select>
<select id="SelectByPersonId" resultClass="Person" parameterClass="int">
select
PER_ID,
PER_FIRST_NAME,
PER_LAST_NAME,
PER_BIRTH_DATE,
PER_WEIGHT_KG,
PER_HEIGHT_M
from PERSON
where PER_ID = #value#
</select>
<insert id="InsertPerson" parameterclass="Person" >
<selectKey property="Id" type="post" resultClass="int">
${selectKey}
</selectKey>
insert into Person
( PER_FIRST_NAME,
PER_LAST_NAME,
PER_BIRTH_DATE,
PER_WEIGHT_KG,
PER_HEIGHT_M)
values
(#FirstName#,#LastName#,#BirthDate#, #WeightInKilograms#, #HeightInMeters#)
</insert>
<update id="UpdatePerson"
parameterclass="Person">
<![CDATA[ update Person set
PER_FIRST_NAME =#FirstName#,
PER_LAST_NAME =#LastName#,
PER_BIRTH_DATE =#BirthDate#,
PER_WEIGHT_KG=#WeightInKilograms#,
PER_HEIGHT_M=#HeightInMeters#
where
PER_ID = #Id#]]>
</update>
<delete id="DeletePerson" parameterclass="Person">
delete from Person
where
PER_ID = #Id#
</delete>
</statements>
</sqlMap>
从上面的映射文件可以看出,通过<insert>、<delete>、<update>、
<select>四个节点,我们分别定义了针对Person 对象的增删改查操作。在这
四个节点中,我们指定了对应的SQL 语句,以update节点为例:
……
<update id=" UpdatePerson" ⑴
parameterClass="Person"> ⑵
<![CDATA[⑶
update Person set ⑷
PER_FIRST_NAME =#FirstName#,⑸
PER_LAST_NAME =#LastName#, ⑹
PER_BIRTH_DATE =#BirthDate#,
PER_WEIGHT_KG=#WeightInKilograms#,
PER_HEIGHT_M=#HeightInMeters#
where
PER_ID = #Id#⑺]]>
</update>
……
⑴ ID
指定了操作ID,之后我们可以在代码中通过指定操作id 来执行此节点所定
义的操作,如:
SqlMap.Update("UpdatePerson", person);
ID设定使得在一个配置文件中定义两个同名节点成为可能(两个update节
点,_____以不同id区分)
⑵ parameterClass
指定了操作所需的参数类型,此例中update 操作以
IBatisNetDemo.Domain.Person类型的对象作为参数,目标是将提供的Person
实例更新到数据库。
parameterClass="Person"中,user为“IBatisNetDemo.Domain.Person”
类的别名,别名可通过typeAlias节点指定,如示例配置文件中的:
<typeAlias alias="Person" type="IBatisNetDemo.Domain.Person,IBatisNetDemo" />⑶ <![CDATA[……]]>
通过<![CDATA[……]]>节点,可以避免SQL 中与XML 规范相冲突的字符对
XML映射文件的合法性造成影响。
⑷ 执行更新操作的SQL,这里的SQL 即实际数据库支持的SQL 语句,将由
IBatisNet填入参数后交给数据库执行。
⑸ SQL中所需的用户名参数,“# FirstName #”在运行期会由传入的Person对象的FirstName
属性填充。
⑹ SQL 中所需的用户性别参数“# LastName #”,将在运行期由传入的user 对象的
LastName属性填充。
⑺ SQL中所需的条件参数“#id#”,将在运行期由传入的Person对象的Person属性
填充。
对于这个示例,IBatisNet在运行期会读取id 为“UpdatePerson”的update节点
的SQL定义,并调用指定的user对象的对应getter方法获取属性值,并用此
属性值,对SQL中的参数进行填充后提交数据库执行。
此例对应的应用级代码如下,其中演示了IBatisNet SQLMap的基本使用方法:
private static SqlMapper sqlMap;
public BaseService()
{
Assembly assembly = Assembly.Load("IBatisNetDemo");
Stream stream = assembly.GetManifestResourceStream("IBatisNetDemo.sqlmap.config");
DomSqlMapBuilder builder = new DomSqlMapBuilder();
sqlMap = builder.Configure( stream );
};
其中,SqlMapper是IbatisNet运作的核心,所有的操作均通过SqlMapper实例完成。这个例子中我将所有的配置文件按照资源文件方式存放,所以从程序集去加载sqlmap.config文件。
可以看出,对于应用层而言,程序员面对的是传统意义上的实体(数据)对象,而不是ADO.NET中的DataReader或者DataTable/DataSet,这使得我们控制最终的数据操作方式,通过Sql的优化来获得最佳的数据库执行效能,这在依赖SQL自动生成的“全自动”ORM机制中是难以实现的。
原文在 cnblogs: http://www.cnblogs.com/shanyou/articles/376094.html