Apache iBatis（現(xiàn)已遷至Google Code下發(fā)展，更名為MyBatis）是當(dāng)前IT項目中使用很廣泛的一個半自動ORM框架，區(qū)別于Hibernate之類的全自動框架，iBatis對數(shù)據(jù)庫的操作擁有更加靈活的控制，對于那些經(jīng)常需要調(diào)用本地數(shù)據(jù)庫函數(shù)自定義SQL語句，或是喜歡自己優(yōu)化SQL執(zhí)行效率的開發(fā)者來說，iBatis是一個非常不錯的選擇。

而得到廣泛應(yīng)用的開源企業(yè)架構(gòu)SpringFramework，也很好的將其進(jìn)行了集成，使得iBatis在 SpringFramework中的使用更加便利、快捷。開發(fā)者所要做的就是繼承SpringFramework中提供的SqlMapClientDaoSupport類即可。下面將簡單介紹使用spring中集成的ibatis進(jìn)行項目中dao層基類封裝，以方便開發(fā)。

1、SqlMapClientFactoryBean 的裝配

SqlMapClientFactoryBean是SqlMapClientTemplate使用的基礎(chǔ)，如果在SpringFramework應(yīng)用中沒有裝配SqlMapClientFactoryBean，那么SqlMapClientTemplate將不可用，報空指針錯誤。其配置信息如下：

<bean class='org.springframework.orm.ibatis.SqlMapClientFactoryBean'> <!-- iBatis sqlmap config 文件位置 --> <property name='configLocation'> <value> /WEB-INF/classes/org/bussiness/config/ibatis/SqlMapConfig.xml </value> </property> <!-- 在SpringFramework配置文件中使用的數(shù)據(jù)源 --> <property name='dataSource'> <ref local='dataSource' /> </property> <!-- 如果需要讀寫Lob字段，需要注入在SpringFramework配置文件中配置好的Handler，這里是Oracle的數(shù)據(jù)庫 --> <property name='lobHandler' ref='oracleLobHandler'/></bean>

2、繼承使用SqlMapClientDaoSupport類

2.1）首先定義一個IBaseDao接口提供各種場景的查詢、修改、刪除、分頁查詢的各種抽象功能方法

package org.biframework.dao.ibatis;import com.ibatis.common.util.PaginatedList;import java.util.List;import org.biframework.exception.DaoException;public abstract interface IBaseDao{ public abstract Object getObject(String paramString, Object paramObject) throws DaoException; @SuppressWarnings('unchecked') public abstract List getList(String paramString, Object paramObject) throws DaoException; public abstract PaginatedList getPgntList(String paramString1, Object paramObject, String paramString2) throws DaoException; public abstract PaginatedList getPgntList(String paramString1, Object paramObject, String paramString2, int paramInt) throws DaoException; @SuppressWarnings('unchecked') public abstract List getListUseSameStmt(String paramString, Object[] paramArrayOfObject) throws DaoException; public abstract int update(String paramString, Object paramObject) throws DaoException; public abstract int transUpdateSameOpt(String paramString, Object[] paramArrayOfObject) throws DaoException; public abstract int transUpdate(Object[][] paramArrayOfObject) throws DaoException; @SuppressWarnings('unchecked') public List getList(String statementName, Object parameterObject, int skipResults, int maxResults) throws DaoException;}

備注：該層也可以不寫

2.2）繼承使用SqlMapClientDaoSupport類并實現(xiàn)IBaseDao接口

package org.biframework.dao.ibatis;import java.util.ArrayList;import java.util.List;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.biframework.exception.DaoException;import org.springframework.orm.ibatis.support.SqlMapClientDaoSupport;import com.ibatis.common.util.PaginatedList;public class BaseDao extends SqlMapClientDaoSupport implements IBaseDao { @SuppressWarnings('unused') private static Log log; protected static final int PAGE_SIZE = 15; @SuppressWarnings('unchecked') static Class class$0; /* synthetic field */ public BaseDao() { } /* 使用spring中集成的ibatis實現(xiàn)數(shù)據(jù)的查詢、修改、刪除 1）當(dāng)請求參數(shù)被封裝為一個普通對象，查詢結(jié)果為List集合： 使用queryForList返回List 源碼方法如下：getSqlMapClientTemplate()，獲取SqlMapClientTemplate對象， 參數(shù)說明：a、statementName sql聲明；b、parameterObject請求參數(shù)對象 queryForList方法源碼如下 public List queryForList(String statementName, Object parameterObject) throws DataAccessException { executeWithListResult(new SqlMapClientCallback() { private final String val$statementName; private final Object val$parameterObject; public Object doInSqlMapClient(SqlMapExecutor executor) throws SQLException { return executor.queryForList(this.val$statementName, this.val$parameterObject); } }); } */ @SuppressWarnings('unchecked') public List getList(String statementName, Object parameterObject) throws DaoException { List list = getSqlMapClientTemplate().queryForList(statementName,parameterObject); return list; } /* 2）當(dāng)請求參數(shù)被封裝為一個數(shù)組對象時： 即使用數(shù)組存放多個傳參對象(obj1、obj2...)而后使用相同sql,進(jìn)行多次查詢，將多次查詢的結(jié)果list1、list2...放到結(jié)果集List中) 使用queryForList返回List 封裝的方法如下： */ @SuppressWarnings('unchecked') public List getListUseSameStmt(String statementName, Object objectParam[]) throws DaoException { List list = null; List temp = null; if (statementName == null || objectParam == null|| objectParam.length == 0){ return list; }else{ for (int i = 0; i < objectParam.length; i++) {if (list == null){ list = new ArrayList(); temp = getSqlMapClientTemplate().queryForList(statementName,objectParam[i]);} if (temp != null){ list.addAll(temp);}} } return list; } /* 3）當(dāng)請求參數(shù)被封裝為一個普通對象，查詢結(jié)果為Object對象 */ @SuppressWarnings('unchecked') public Object getObject(String statementName, Object parameterObject) throws DaoException { Object result = null; List list = getSqlMapClientTemplate().queryForList(statementName,parameterObject); if (list != null && list.size() > 0){ result = list.get(0); } return result; } /* 4）ibatis-common-2.jar、使用ibatis自身封裝的PaginatedList工具類進(jìn)行分頁查詢，每頁15條數(shù)據(jù)。 public PaginatedList queryForPaginatedList(String statementName, Object parameterObject, int pageSize) throws DataAccessException { if (((this.sqlMapClient instanceof ExtendedSqlMapClient)) && (((ExtendedSqlMapClient)this.sqlMapClient).getDelegate().getTxManager() == null)) { throw new InvalidDataAccessApiUsageException('SqlMapClient needs to have DataSource to allow for lazy loading - specify SqlMapClientFactoryBean’s ’dataSource’ property'); } (PaginatedList)execute(new SqlMapClientCallback() { private final String val$statementName; private final Object val$parameterObject; private final int val$pageSize; public Object doInSqlMapClient(SqlMapExecutor executor) throws SQLException { return executor.queryForPaginatedList(this.val$statementName, this.val$parameterObject, this.val$pageSize); } }); } */ public PaginatedList getPgntList(String statementName, Object parameterObject, String pageDirection) throws DaoException { PaginatedList list = getSqlMapClientTemplate().queryForPaginatedList(statementName, parameterObject, 15); if ('next'.equals(pageDirection)) list.nextPage(); else if ('previous'.equals(pageDirection)) list.previousPage(); else if ('first'.equals(pageDirection)) list.isFirstPage(); else if ('last'.equals(pageDirection)) list.isLastPage(); return list; } /* 4）自己指定分頁查詢的數(shù)量 */ public PaginatedList getPgntList(String statementName, Object parameterObject, String pageDirection, int pageSize) throws DaoException { PaginatedList list = getSqlMapClientTemplate().queryForPaginatedList(statementName, parameterObject, pageSize); if ('next'.equals(pageDirection)) { System.out.println('下一頁'); list.nextPage(); } else if ('previous'.equals(pageDirection)) { System.out.println('上一頁'); list.previousPage(); } else if ('first'.equals(pageDirection)) { System.out.println('首頁'); list.isFirstPage(); } else if ('last'.equals(pageDirection)) { System.out.println('末頁'); list.isLastPage(); } return list; } /* 5）該方法暫時未理解其主要是處于何種場景使用 */ public int update(String statementName, Object parameterObject) throws DataAccessException { Integer result = (Integer)execute(new SqlMapClientCallback() { private final String val$statementName; private final Object val$parameterObject; public Object doInSqlMapClient(SqlMapExecutor executor) throws SQLException { return new Integer(executor.update(this.val$statementName, this.val$parameterObject)); } }); return result.intValue(); } */ public int transUpdate(Object statementAndparameter[][]) throws DaoException { Object statements[] = statementAndparameter[0]; Object parameters[] = statementAndparameter[1]; int result = 0; for (int i = 0; i < statements.length; i++) { String name = (String) statements[i]; Object param = parameters[i]; result += getSqlMapClientTemplate().update(name, param); } return result; } /* 6）請求參數(shù)被封裝為一個數(shù)組對象，返回結(jié)果為成功更新的記錄數(shù)使用spring封裝的update方法進(jìn)行更新操作 */ public int transUpdateSameOpt(String statementName, Object objectParam[]) throws DaoException { int result = 0; if (statementName == null || objectParam == null|| objectParam.length == 0) return result; for (int i = 0; i < objectParam.length; i++) result += getSqlMapClientTemplate().update(statementName, objectParam[i]); return result; } /* 7）請求參數(shù)被封裝為一個普通對象，返回結(jié)果為成功更新的記錄數(shù) */ public int update(String statementName, Object parameterObject) throws DaoException { int result = getSqlMapClientTemplate().update(statementName,parameterObject); return result; } static { log = LogFactory.getLog(org.biframework.dao.ibatis.BaseDao.class); } /* 8）請求參數(shù)被封裝為一個普通對象，并對查詢的結(jié)果記錄指定跳躍數(shù)和最大結(jié)果集 */ @SuppressWarnings('unchecked') public List getList(String statementName, Object parameterObject, int skipResults, int maxResults) throws DaoException { return getSqlMapClientTemplate().queryForList(statementName,parameterObject, skipResults, maxResults); }}

3、進(jìn)行dao層配置，并進(jìn)行查詢等操作

3.1）所有的dao層都繼承BaseDao類

import java.sql.ResultSet;import java.sql.SQLException;import java.util.List;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.biframework.dao.ibatis.BaseDao;import org.biframework.exception.DaoException;import org.bussiness.product.detailquery.bo.StPolicyBean;public class StPolicyDao extends BaseDao { protected static Log log = LogFactory.getLog(StPolicyDao.class); @SuppressWarnings('unchecked') public List getStPerm(StPBean param) throws DaoException{ return super.getList('getShortPrem', param); } public Object getStPermCount(StPBean param) throws DaoException{ return super.getObject('getShortPremCount', param); } }}

3.2）進(jìn)行dao裝配 detailQuery-applicationContext.xml

<bean class='org.bussiness.product.detailquery.dao.NstPolicyDao'> <property name='dataSource'> <ref bean='dataSource' /> </property> <property name='sqlMapClient'> <ref bean='sqlMapClient' /> </property></bean>

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持好吧啦網(wǎng)。