Ibatisnet Quick Start

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>

         <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。

例子代码 https://files.cnblogs.com/shanyou/IBatisNet.rar

posted @ 2012-12-26 20:42  大智若简  阅读(139)  评论(0编辑  收藏  举报