iBatisNet入门示例源码详解

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>

         <sectionGroup name="iBATIS">

              <section name="logging" type="IBatisNet.Common.Logging.ConfigurationSectionHandler, IBatisNet.Common" />

         </sectionGroup>

         <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />

</configSections>

<iBATIS>

         <logging>                       

              <logFactoryAdapter type="IBatisNet.Common.Logging.Impl.Log4NetLoggerFA, IBatisNet.Common.Logging.Log4Net">

                   <arg key="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 -->

         <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">

              <param name="File" value="log.txt" />

              <param name="AppendToFile" value="true" />

              <param name="MaxSizeRollBackups" value="2" />

              <param name="MaximumFileSize" value="100KB" />

              <param name="RollingStyle" value="Size" />

              <param name="StaticLogFileName" value="true" />

              <layout type="log4net.Layout.PatternLayout">

                   <param name="Header" value="[Header]"r"n" />

                   <param name="Footer" value="[Footer]"r"n" />

                   <param name="ConversionPattern" value="%d [%t] %-5p %c [%x] - %m%n" />

              </layout>

         </appender>

                   <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">

              <layout type="log4net.Layout.PatternLayout">

                   <param name="ConversionPattern" value="%d [%t] %-5p %c [%x] &lt;%X{auth}&gt; - %m%n" />

              </layout>

         </appender>       

         <!-- Set root logger level to ERROR and its appenders -->

         <root>

              <level value="DEBUG" />

              <appender-ref ref="RollingLogFileAppender" />

              <appender-ref ref="ConsoleAppender" />

         </root>

        

         <!-- Print only messages of level DEBUG or above in the packages -->

         <logger name="IBatisNet.DataMapper.Configuration.Cache.CacheModel">

              <level value="DEBUG" />

         </logger>

         <logger name="IBatisNet.DataMapper.Configuration.Statements.PreparedStatementFactory">

              <level value="DEBUG" />

         </logger>

         <logger name="IBatisNet.DataMapper.LazyLoadList">

              <level value="DEBUG" />

         </logger>

         <logger name="IBatisNet.DataAccess.DaoSession">

              <level value="DEBUG" />

         </logger>

         <logger name="IBatisNet.DataMapper.SqlMapSession">

              <level value="DEBUG" />

         </logger>

         <logger name="IBatisNet.Common.Transaction.TransactionScope">

              <level value="DEBUG" />

         </logger>

         <logger name="IBatisNet.DataAccess.Configuration.DaoProxy">

              <level value="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="http://www.cnblogs.com/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。