iBATIS入门示例及注释

企业开发 2018-05-14 20:24:04 阅读次数: 2

工程的结构：


一、SqlMapConfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sqlMapConfig        
    PUBLIC "-//ibatis.apache.org//DTD SQL Map Config 2.0//EN"        
    "http://ibatis.apache.org/dtd/sql-map-config-2.dtd">
<sqlMapConfig>

	<!-- 加载数据库属性文件 -->
	<properties resource="SqlMap.properties" />

	<!-- 
		１、lazyLoadingEnabled:是否延迟加载（只加载必要信息而推迟其他未明确请求数据的技术）,默认值是true。
		２、cacheModelsEnabled:ibatis的高速缓存，将近期使用过的数据保存到内存中，值为true或false,全局控制sqlMapClient的缓存
		３、enhancementEnabled:值true或false，作用用来表示是否使用cglib中那些已经优化的javabean类来提高延迟加载的性能。
		４、useStatementNameSpaces:是否使用命名空间（true/false）.假如使用在引用的时候需要加上（命名空间＋ID）
		来访问,默认是false。
		5、 errorTracingEnabled:是否启用错误日志，在开发期间建议设为"true" 以方便调试     
	-->
	<settings cacheModelsEnabled="true" lazyLoadingEnabled="true"
		enhancementEnabled="true" errorTracingEnabled="true"
		useStatementNamespaces="true" />

	<transactionManager type="JDBC"><!-- type指定事务管理器：JDBC,JTA,EXTERNAL, -->
		<dataSource type="SIMPLE"><!-- type值由：SIMPLE,DBCP,JNDI -->
			<property value="${JDBC.Driver}" name="JDBC.Driver" />
			<property value="${JDBC.ConnectionURL}"
				name="JDBC.ConnectionURL" />
			<property value="${JDBC.Username}" name="JDBC.Username" />
			<property value="${JDBC.Password}" name="JDBC.Password" />
		</dataSource>
	</transactionManager>

	<!-- 引入所有的SQL Map配置文件，这里的路径是classpath的相对路径 -->
	<sqlMap resource="com/wy/pojo/Customer.xml" />

</sqlMapConfig>

二、Customer.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sqlMap        
    PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN"        
    "http://ibatis.apache.org/dtd/sql-map-2.dtd">

<sqlMap namespace="cust">
	<!-- 类型别名 ， 为一个pojo类取一个别名， 以便在下面用时候， 直接用别名引用对象 -->
	<typeAlias alias="Customer" type="com.wy.pojo.Customer" />
	<!-- 数据返回类型，我用的是一张表 ， id 与select 标签的id一致， 就可以指定返回是多个pojo,resultMap结果映射到预先定义的resultMap中  -->
	<resultMap class="Customer" id="getAllCustomer">
		<result property="id" column="id" />
		<result property="name" column="name" />
		<result property="email" column="email" />
		<result property="adress" column="adress" />
		<result property="phone" column="phone" />
	</resultMap>
	<!-- 根据自己的SQL查询语句， 及传入的参数来决定它的返回类型，resutlClass="返回类型" parameterClass="传入的参数类型"  -->
	<select id="selectAllRecords" resultClass="Customer">
		<![CDATA[
		    select * from customer
		]]>
	</select>
	<select id="selectOneRecord" parameterClass="java.lang.Integer"
		resultMap="getAllCustomer">
		<![CDATA[
		     select * from customer where id = #id#
		 ]]>    
	</select>
	<!-- #id#由方法的传入参数填充 -->
	<insert id="insertOneRecord" parameterClass="Customer">
		<!-- 序列的返回值是int类型，最好对应数据库id列；keyProperty="id"的id是对应的BEAN里面的属性 -->
		<selectKey resultClass="int" keyProperty="id">
			select customerPKSquence.nextVal as id from dual
		</selectKey>
		<!-- 屏蔽特殊符 -->
		<![CDATA[ 
            insert into customer (id,name, email, adress, phone) values (#id#,#name#, #email#, #adress#, #phone#)
         ]]>
	</insert>

	<update id="updateOneRecord" parameterClass="Customer">
		<![CDATA[
		   update customer set name=#name#, email=#email#, adress=#adress#,phone=#phone# where id=#id#
		]]>
	</update>

	<delete id="deleteOneRecord" parameterClass="java.lang.Integer">
		<![CDATA[ 
		   delete from customer where id = #id#
		]]>
	</delete>
</sqlMap>
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<statement id="statementName"
        [parameterClass="some.class.Name"] //表示输入的参数类型为Class
        [resultClass="some.class.Name"] //表示输出的参数类型为Class
        [parameterMap="nameOfParameterMap"] //表示输入的参数类型为Map
        [resultMap="nameOfResultMap"] //表示输出的参数类型为Class
        [cacheModel="nameOfCache"]
        >
        select * from t_user where sex = [?|#propertyName#]
        order by [$simpleDynamic$]
    </statement>

1、对于参数定义，尽量使用parameterClass,即直接将pojo作为statement的调用参数，如果输入的参数是java.util.map,那么map中的键值将作为输入参数，普通基本类型就是直接输入。
2、对于返回结果而言，尽量也使用resultClass,直接将字段名与pojo相对应。
3、而parameterMap与resultMap实现了pojo到数据库字段的映射配置，parameterMap 使用较少，而resultMap 则大多用于嵌套查询以及存储过程的 。 

Customer.java

package com.wy.pojo;

public class Customer {
	private Integer id;

	private String name;

	private String email;

	private String adress;

	public Customer() {
	}

	public Customer(Integer id, String name, String email, String adress,
			String phone) {
		super();
		this.id = id;
		this.name = name;
		this.email = email;
		this.adress = adress;
		this.phone = phone;
	}

	public String getAdress() {
		return adress;
	}

	public void setAdress(String adress) {
		this.adress = adress;
	}

	private String phone;

	public String getEmail() {
		return email;
	}

	public Integer getId() {
		return id;
	}

	public String getName() {
		return name;
	}

	public String getPhone() {
		return phone;
	}

	public void setEmail(String email) {
		this.email = email;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public void setName(String name) {
		this.name = name;
	}

	public void setPhone(String phone) {
		this.phone = phone;
	}

	public String toString() {
		StringBuffer sb = new StringBuffer();
		sb.append("{");
		sb.append("id:" + id + ",");
		sb.append("name:'" + name + "',");
		sb.append("email:'" + email + "',");
		sb.append("adress:'" + adress + "',");
		sb.append("phone:'" + phone + "'");
		sb.append("}");
		return sb.toString();
	}

}

三、CustomerDaoImpl.java

package com.wy.dao.impl;

import java.sql.SQLException;
import java.util.List;

import com.ibatis.sqlmap.client.SqlMapClient;
import com.wy.dao.ICustomerDao;
import com.wy.pojo.Customer;
import com.wy.util.SQLMapClient;

public class CustomerDaoImpl implements ICustomerDao {

    // 查询数据的SQL
    private static final String SELECT_All_CUSTOMERS = "cust.selectAllRecords";
    private static final String SELECT_ONE_CUSTOMER = "cust.selectOneRecord";
    //插入数据
    private static final String INSERT_ONE_CUSTOMER  = "cust.insertOneRecord";
    //删除数据
    private static final String DELETE_ONE_CUSTOMER  = "cust.deleteOneRecord";
    //修改
    private static final String UPDATE_ONE_CUSTOMER  = "cust.updateOneRecord";

    private SqlMapClient sqlMapClient = null;

    public CustomerDaoImpl() {
        sqlMapClient = SQLMapClient.getSqlMapClient();
    }

    //插入数据
    @Override
    public void add(Customer student) {
        try {
            sqlMapClient.insert(INSERT_ONE_CUSTOMER, student);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    //删除
    @Override
    public void deleteCustomerById(int id) {
        try {
            sqlMapClient.delete(DELETE_ONE_CUSTOMER, id);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    //查询所有数据
    @SuppressWarnings("unchecked")
    @Override
    public List<Customer> queryAllCustomers() {
        // TODO Auto-generated method stub
        List<Customer> list = null;
        try {
            list = sqlMapClient.queryForList(SELECT_All_CUSTOMERS);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return list;
    }
    public Customer queryOneCustomer(Integer id){
        Customer customer = null;
        try {
            customer = (Customer) sqlMapClient.queryForObject(SELECT_ONE_CUSTOMER,id);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return customer;
    } 
    //修改
    public void update(Customer customer) {
        try {
            sqlMapClient.update(UPDATE_ONE_CUSTOMER, customer);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

四、 SQLMapClint.java

package com.wy.util;

import java.io.IOException;
import java.io.Reader;

import com.ibatis.common.resources.Resources;
import com.ibatis.sqlmap.client.SqlMapClient;
import com.ibatis.sqlmap.client.SqlMapClientBuilder;

public class SQLMapClient {
    private static SqlMapClient sqlMapClient = null;

    static {
        String resource = "SqlMapConfig.xml";
        Reader reader = null;
        try {
            //读取ClassPath下的配置文件
            reader = Resources.getResourceAsReader(resource);
            sqlMapClient = SqlMapClientBuilder.buildSqlMapClient(reader);
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            try {
                reader.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

    public static SqlMapClient getSqlMapClient() {
        return sqlMapClient;
    }
}

log4j.properties

#定义输出级别和输出平台
log4j.rootLogger=debug,consoleAppender
#设定consoleAppender输出平台
log4j.appender.consoleAppender = org.apache.log4j.ConsoleAppender
#输出信息的级别
#log4j.appender.consoleAppender.Threshold = info
log4j.appender.consoleAppender.layout = org.apache.log4j.PatternLayout
log4j.appender.consoleAppender.layout.ConversionPattern=[%-5p][%d{yyyy-MM-dd HH:mm:ss}][%l]:%m%n
log4j.appender.consoleAppender.ImmediateFlush = true

#sqlMap 配置
log4j.logger.com.ibatis = DEBUG  
log4j.logger.com.ibatis.common.jdbc.SimpleDataSource = DEBUG  
log4j.logger.com.ibatis.common.jdbc.ScriptRunner = DEBUG  
log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate = DEBUG  
log4j.logger.java.sql.Connection = DEBUG  
log4j.logger.java.sql.Statement = DEBUG  
log4j.logger.java.sql.PreparedStatement = DEBUG, consoleAppender  
log4j.logger.java.sql.ResultSet = DEBUG

五、测试 Test.java

package com.wy.test;

import java.util.List;

import org.apache.log4j.Logger;

import com.wy.dao.ICustomerDao;
import com.wy.dao.impl.CustomerDaoImpl;
import com.wy.pojo.Customer;

public class Test {
    private final static Logger log = Logger.getLogger(Test.class);

    public static void main(String[] args) {

        ICustomerDao customerDao = new CustomerDaoImpl();

        //插入数据
        Customer customers = new Customer();
        customers.setName("wy");
        customers.setPhone("13900000000");
        customers.setEmail("[email protected]");
        customers.setAdress("北京");
        
        customerDao.add(customers);

        //修改数据
        Customer cust = customerDao.queryOneCustomer(21);
        cust.setName("wywy");

        customerDao.update(cust);

        //删除
        customerDao.deleteCustomerById(4);

        //查询所有数据
        List<Customer> list = customerDao.queryAllCustomers();
        for (Customer customer : list) {
            log.info("id:" + customer.getId());
            log.info("name:" + customer.getName());
            log.info("phone:" + customer.getPhone());
            log.info("email:" + customer.getEmail());
            log.info("address:" + customer.getAdress());
        }

    }

}

下面是iBatis的配置关系图


遇到一个莫名其妙的错误：

Exception in thread "main" java.lang.ExceptionInInitializerError
	at com.wy.dao.impl.CustomerDaoImpl.<init>(CustomerDaoImpl.java:26)
	at com.wy.test.Test.main(Test.java:16)
Caused by: java.lang.RuntimeException: Error occurred.  Cause: com.ibatis.common.xml.NodeletException: Error parsing XML.  Cause: org.xml.sax.SAXParseException: XML document structures must start and end within the same entity.
	at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser.parse(SqlMapConfigParser.java:49)
	at com.ibatis.sqlmap.client.SqlMapClientBuilder.buildSqlMapClient(SqlMapClientBuilder.java:63)
	at com.wy.util.SQLMapClient.<clinit>(SQLMapClient.java:19)
	... 2 more
Caused by: com.ibatis.common.xml.NodeletException: Error parsing XML.  Cause: org.xml.sax.SAXParseException: XML document structures must start and end within the same entity.
	at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:53)
	at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser.parse(SqlMapConfigParser.java:46)
	... 4 more
Caused by: org.xml.sax.SAXParseException: XML document structures must start and end within the same entity.
	at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195)
	at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:174)
	at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:388)
	at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1414)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.endEntity(XMLDocumentFragmentScannerImpl.java:902)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.endEntity(XMLDocumentScannerImpl.java:605)
	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.endEntity(XMLEntityManager.java:1393)
	at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.load(XMLEntityScanner.java:1763)
	at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.scanData(XMLEntityScanner.java:1242)
	at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanComment(XMLScanner.java:756)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanComment(XMLDocumentFragmentScannerImpl.java:1036)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2945)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107)
	at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:225)
	at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:283)
	at com.ibatis.common.xml.NodeletParser.createDocument(NodeletParser.java:157)
	at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:50)
	... 5 more

查了好久原因SqlMapConfig.xml中有一个注释后面没有加空格

 <!-- 引入所有的SQL Map配置文件，这里的路径是classpath的相对路径-->引起。

加上空格后问题解决。不知道iBATIS为什么会出现这种问题！

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