spring+mybatis 物理分页
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新项目用的spring mvc 和 mybatis 分页。研究了一下,集众家之长然后形成现在的项目。我把分页部分剥离出来与大家分享。如有不妥的地方欢迎交流拍砖。
单独做了一个小项目,放到了下载区,如果有用到的朋友可以去下载。
本项目采用了拦截器,就是mybaits自带的plus功能。将每次select操作都进行拦截。
项目架构如下:
1:首先从cotroller层出发,啥也不说,上代码。这个最实惠
- package com.flydreamer.controller;
- import java.util.HashMap;
- import java.util.Map;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import org.springframework.beans.factory.annotation.Autowired;
- import org.springframework.stereotype.Controller;
- import org.springframework.web.bind.annotation.RequestMapping;
- import org.springframework.web.servlet.ModelAndView;
- import com.flydreamer.logic.UserService;
- import com.flydreamer.page.Page;
- import com.flydreamer.page.PageContext;
- import com.flydreamer.util.web.HandlerResult;
- @Controller
- @RequestMapping("/user.do")
- public class UserController {
- @Autowired
- private UserService userService;
- @RequestMapping(params = ("method=list"))
- public ModelAndView listAll(HttpServletRequest request,HttpServletResponse response) {
- //可以将分页参数获取封装,已达到更好的复用效果。
- //page=2&pageSize=10&totalPages=19&totalRows=188
- String pagec = request.getParameter("page");
- String pageSize = request.getParameter("pageSize");
- String totalPages = request.getParameter("totalPages");
- String totalRows = request.getParameter("totalRows");
- //方法1:将分页参数直接放到mapper接口函数参数中,也可在对象中定义名字为page的属性,反射一样可以得到
- //后台连接直接获取
- //Page page = new Page();
- //方法2:不用进行map传参,用ThreadLocal进行传参,方便没有侵入性
- PageContext page = PageContext.getContext();
- //请自行验证
- if(null == pagec)
- {
- page.setCurrentPage(1);
- page.setPageSize(10);
- }
- else{
- page.setCurrentPage(Integer.parseInt(pagec));
- page.setPageSize(Integer.parseInt(pageSize));
- page.setTotalPages(Integer.parseInt(totalPages));
- page.setTotalRows(Integer.parseInt(totalRows));
- }
- page.setPagination(true);
- // 方法1用
- // Map map = new HashMap();
- // map.put("page", page);
- // HandlerResult rs = userService.list(map);
- //方法2用
- HandlerResult rs = userService.list();
- ModelAndView mv = new ModelAndView("/views/show.jsp");
- mv.addObject("userList", rs.getResultObj());
- mv.addObject("page",page);
- return mv;
- }
- }
package com.flydreamer.controller;import java.util.HashMap;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.servlet.ModelAndView;import com.flydreamer.logic.UserService;import com.flydreamer.page.Page;import com.flydreamer.page.PageContext;import com.flydreamer.util.web.HandlerResult;@Controller@RequestMapping("/user.do")public class UserController {@Autowiredprivate UserService userService;@RequestMapping(params = ("method=list"))public ModelAndView listAll(HttpServletRequest request,HttpServletResponse response) {//可以将分页参数获取封装,已达到更好的复用效果。//page=2&pageSize=10&totalPages=19&totalRows=188String pagec = request.getParameter("page"); String pageSize = request.getParameter("pageSize"); String totalPages = request.getParameter("totalPages"); String totalRows = request.getParameter("totalRows"); //方法1:将分页参数直接放到mapper接口函数参数中,也可在对象中定义名字为page的属性,反射一样可以得到//后台连接直接获取//Page page = new Page();//方法2:不用进行map传参,用ThreadLocal进行传参,方便没有侵入性PageContext page = PageContext.getContext();//请自行验证if(null == pagec){page.setCurrentPage(1);page.setPageSize(10);}else{page.setCurrentPage(Integer.parseInt(pagec));page.setPageSize(Integer.parseInt(pageSize));page.setTotalPages(Integer.parseInt(totalPages));page.setTotalRows(Integer.parseInt(totalRows));}page.setPagination(true);//方法1用//Map map = new HashMap();//map.put("page", page);//HandlerResult rs = userService.list(map);//方法2用HandlerResult rs = userService.list();ModelAndView mv = new ModelAndView("/views/show.jsp");mv.addObject("userList", rs.getResultObj());mv.addObject("page",page);return mv;}}简要说明:本文采用两种方式将page对象传入到拦截器中。第一种方式是采用参数传值,不管是用map还是在统一参数对象中名称为page的属性都可以在分页拦截器中得到page的值。第二种方式是用ThreadLocal,对service层没有侵入性。比较方便。
2:Service层代码。没啥可说的上代码
- package com.flydreamer.logic;
- import java.util.Map;
- import org.springframework.beans.factory.annotation.Autowired;
- import org.springframework.stereotype.Service;
- import com.flydreamer.orm.mapper.UsersMapper;
- import com.flydreamer.util.web.HandlerResult;
- @Service
- public class UserService {
- @Autowired
- private UsersMapper usersMappser;
- /**
- * 统一Service出口,方便管理
- * @param map
- * @return
- */
- public HandlerResult list(Map map){
- HandlerResult rs = new HandlerResult();
- rs.setResultObj(usersMappser.list(map));
- return rs;
- }
- /**
- * 采用本地线程的方式分页
- * @return
- */
- public HandlerResult list(){
- HandlerResult rs = new HandlerResult();
- rs.setResultObj(usersMappser.list2());
- return rs;
- }
- public UsersMapper getUsersMappser() {
- return usersMappser;
- }
- public void setUsersMappser(UsersMapper usersMappser) {
- this.usersMappser = usersMappser;
- }
- }
package com.flydreamer.logic;import java.util.Map;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import com.flydreamer.orm.mapper.UsersMapper;import com.flydreamer.util.web.HandlerResult;@Servicepublic class UserService {@Autowiredprivate UsersMapper usersMappser;/** * 统一Service出口,方便管理 * @param map * @return */public HandlerResult list(Map map){HandlerResult rs = new HandlerResult();rs.setResultObj(usersMappser.list(map));return rs;}/** * 采用本地线程的方式分页 * @return */public HandlerResult list(){HandlerResult rs = new HandlerResult();rs.setResultObj(usersMappser.list2());return rs;}public UsersMapper getUsersMappser() {return usersMappser;}public void setUsersMappser(UsersMapper usersMappser) {this.usersMappser = usersMappser;}}
3:mybatis接口
- package com.flydreamer.orm.mapper;
- import java.util.List;
- import java.util.Map;
- import com.flydreamer.orm.SqlMapper;
- public interface UsersMapper extends SqlMapper{
- public List list(Map para);
- public List list2();
- }
package com.flydreamer.orm.mapper;import java.util.List;import java.util.Map;import com.flydreamer.orm.SqlMapper;public interface UsersMapper extends SqlMapper{public List list(Map para);public List list2();}
4:page的拦截器
- package com.flydreamer.interceptor;
- import java.sql.Connection;
- import java.sql.PreparedStatement;
- import java.sql.ResultSet;
- import java.sql.SQLException;
- import java.util.List;
- import java.util.Properties;
- import org.apache.ibatis.builder.xml.dynamic.ForEachSqlNode;
- import org.apache.ibatis.executor.ErrorContext;
- import org.apache.ibatis.executor.Executor;
- import org.apache.ibatis.executor.ExecutorException;
- import org.apache.ibatis.logging.Log;
- import org.apache.ibatis.logging.LogFactory;
- import org.apache.ibatis.mapping.BoundSql;
- import org.apache.ibatis.mapping.MappedStatement;
- import org.apache.ibatis.mapping.ParameterMapping;
- import org.apache.ibatis.mapping.ParameterMode;
- import org.apache.ibatis.mapping.SqlSource;
- import org.apache.ibatis.mapping.MappedStatement.Builder;
- import org.apache.ibatis.plugin.Interceptor;
- import org.apache.ibatis.plugin.Intercepts;
- import org.apache.ibatis.plugin.Invocation;
- import org.apache.ibatis.plugin.Plugin;
- import org.apache.ibatis.plugin.Signature;
- import org.apache.ibatis.reflection.MetaObject;
- import org.apache.ibatis.reflection.property.PropertyTokenizer;
- import org.apache.ibatis.session.Configuration;
- import org.apache.ibatis.session.ResultHandler;
- import org.apache.ibatis.session.RowBounds;
- import org.apache.ibatis.type.TypeHandler;
- import org.apache.ibatis.type.TypeHandlerRegistry;
- import com.flydreamer.page.Dialect;
- import com.flydreamer.page.MySql5Dialect;
- import com.flydreamer.page.OracleDialect;
- import com.flydreamer.page.Page;
- import com.flydreamer.page.PageContext;
- import com.flydreamer.page.ReflectHelper;
- //只拦截select部分
- @Intercepts({@Signature(type=Executor.class,method="query",args={ MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class })})
- public class PaginationInterceptor implements Interceptor{
- private final static Log log = LogFactory.getLog(PaginationInterceptor.class);
- Dialect dialect = new MySql5Dialect();
- public Object intercept(Invocation invocation) throws Throwable {
- MappedStatement mappedStatement=(MappedStatement)invocation.getArgs()[0];
- Object parameter = invocation.getArgs()[1];
- BoundSql boundSql = mappedStatement.getBoundSql(parameter);
- String originalSql = boundSql.getSql().trim();
- RowBounds rowBounds = (RowBounds)invocation.getArgs()[2];
- Object parameterObject = boundSql.getParameterObject();
- if(boundSql==null || boundSql.getSql()==null || "".equals(boundSql.getSql()))
- return null;
- //分页参数--上下文传参
- Page page = null;
- PageContext context=PageContext.getContext();
- //map传参每次都将currentPage重置,先判读map再判断context
- if(parameterObject!=null)
- page = (Page)ReflectHelper.isPage(parameterObject,"page");
- //分页参数--context参数里的Page传参
- if(page==null && context.isPagination()==true)
- {
- page = context;
- }
- //后面用到了context的东东
- if(page!=null && page.isPagination()==true)
- {
- int totpage=page.getTotalRows();
- //得到总记录数
- if (totpage==0)
- {
- StringBuffer countSql = new StringBuffer(originalSql.length()+100 );
- countSql.append("select count(1) from (").append(originalSql).append(") t");
- Connection connection=mappedStatement.getConfiguration().getEnvironment().getDataSource().getConnection() ;
- PreparedStatement countStmt = connection.prepareStatement(countSql.toString());
- BoundSql countBS = new BoundSql(mappedStatement.getConfiguration(),countSql.toString(),boundSql.getParameterMappings(),parameterObject);
- setParameters(countStmt,mappedStatement,countBS,parameterObject);
- ResultSet rs = countStmt.executeQuery();
- if (rs.next()) {
- totpage = rs.getInt(1);
- }
- rs.close();
- countStmt.close();
- connection.close();
- }
- //分页计算
- page.init(totpage,page.getPageSize(),page.getCurrentPage());
- if(rowBounds == null || rowBounds == RowBounds.DEFAULT){
- rowBounds= new RowBounds(page.getPageSize()*(page.getCurrentPage()-1),page.getPageSize());
- }
- //分页查询 本地化对象 修改数据库注意修改实现
- String pagesql=dialect.getLimitString(originalSql, rowBounds.getOffset(), rowBounds.getLimit());
- invocation.getArgs()[2] = new RowBounds(RowBounds.NO_ROW_OFFSET, RowBounds.NO_ROW_LIMIT);
- BoundSql newBoundSql = new BoundSql(mappedStatement.getConfiguration(), pagesql,boundSql.getParameterMappings(),boundSql.getParameterObject());
- MappedStatement newMs = copyFromMappedStatement(mappedStatement,new BoundSqlSqlSource(newBoundSql));
- invocation.getArgs()[0]= newMs;
- }
- return invocation.proceed();
- }
- public static class BoundSqlSqlSource implements SqlSource {
- BoundSql boundSql;
- public BoundSqlSqlSource(BoundSql boundSql) {
- this.boundSql = boundSql;
- }
- public BoundSql getBoundSql(Object parameterObject) {
- return boundSql;
- }
- }
- public Object plugin(Object arg0) {
- return Plugin.wrap(arg0, this);
- }
- public void setProperties(Properties arg0) {
- }
- /**
- * 对SQL参数(?)设值,参考org.apache.ibatis.executor.parameter.DefaultParameterHandler
- * @param ps
- * @param mappedStatement
- * @param boundSql
- * @param parameterObject
- * @throws SQLException
- */
- private void setParameters(PreparedStatement ps,MappedStatement mappedStatement,BoundSql boundSql,Object parameterObject) throws SQLException {
- ErrorContext.instance().activity("setting parameters").object(mappedStatement.getParameterMap().getId());
- List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
- if (parameterMappings != null) {
- Configuration configuration = mappedStatement.getConfiguration();
- TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry();
- MetaObject metaObject = parameterObject == null ? null: configuration.newMetaObject(parameterObject);
- for (int i = 0; i < parameterMappings.size(); i++) {
- ParameterMapping parameterMapping = parameterMappings.get(i);
- if (parameterMapping.getMode() != ParameterMode.OUT) {
- Object value;
- String propertyName = parameterMapping.getProperty();
- PropertyTokenizer prop = new PropertyTokenizer(propertyName);
- if (parameterObject == null) {
- value = null;
- } else if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
- value = parameterObject;
- } else if (boundSql.hasAdditionalParameter(propertyName)) {
- value = boundSql.getAdditionalParameter(propertyName);
- } else if (propertyName.startsWith(ForEachSqlNode.ITEM_PREFIX)&& boundSql.hasAdditionalParameter(prop.getName())) {
- value = boundSql.getAdditionalParameter(prop.getName());
- if (value != null) {
- value = configuration.newMetaObject(value).getValue(propertyName.substring(prop.getName().length()));
- }
- } else {
- value = metaObject == null ? null : metaObject.getValue(propertyName);
- }
- TypeHandler typeHandler = parameterMapping.getTypeHandler();
- if (typeHandler == null) {
- throw new ExecutorException("There was no TypeHandler found for parameter "+ propertyName + " of statement "+ mappedStatement.getId());
- }
- typeHandler.setParameter(ps, i + 1, value, parameterMapping.getJdbcType());
- }
- }
- }
- }
- private MappedStatement copyFromMappedStatement(MappedStatement ms,
- SqlSource newSqlSource) {
- Builder builder = new MappedStatement.Builder(ms.getConfiguration(),
- ms.getId(), newSqlSource, ms.getSqlCommandType());
- builder.resource(ms.getResource());
- builder.fetchSize(ms.getFetchSize());
- builder.statementType(ms.getStatementType());
- builder.keyGenerator(ms.getKeyGenerator());
- builder.keyProperty(ms.getKeyProperty());
- builder.timeout(ms.getTimeout());
- builder.parameterMap(ms.getParameterMap());
- builder.resultMaps(ms.getResultMaps());
- builder.cache(ms.getCache());
- MappedStatement newMs = builder.build();
- return newMs;
- }
- }
package com.flydreamer.interceptor;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import java.util.List;import java.util.Properties;import org.apache.ibatis.builder.xml.dynamic.ForEachSqlNode;import org.apache.ibatis.executor.ErrorContext;import org.apache.ibatis.executor.Executor;import org.apache.ibatis.executor.ExecutorException;import org.apache.ibatis.logging.Log;import org.apache.ibatis.logging.LogFactory;import org.apache.ibatis.mapping.BoundSql;import org.apache.ibatis.mapping.MappedStatement;import org.apache.ibatis.mapping.ParameterMapping;import org.apache.ibatis.mapping.ParameterMode;import org.apache.ibatis.mapping.SqlSource;import org.apache.ibatis.mapping.MappedStatement.Builder;import org.apache.ibatis.plugin.Interceptor;import org.apache.ibatis.plugin.Intercepts;import org.apache.ibatis.plugin.Invocation;import org.apache.ibatis.plugin.Plugin;import org.apache.ibatis.plugin.Signature;import org.apache.ibatis.reflection.MetaObject;import org.apache.ibatis.reflection.property.PropertyTokenizer;import org.apache.ibatis.session.Configuration;import org.apache.ibatis.session.ResultHandler;import org.apache.ibatis.session.RowBounds;import org.apache.ibatis.type.TypeHandler;import org.apache.ibatis.type.TypeHandlerRegistry;import com.flydreamer.page.Dialect;import com.flydreamer.page.MySql5Dialect;import com.flydreamer.page.OracleDialect;import com.flydreamer.page.Page;import com.flydreamer.page.PageContext;import com.flydreamer.page.ReflectHelper;//只拦截select部分@Intercepts({@Signature(type=Executor.class,method="query",args={ MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class })})public class PaginationInterceptor implements Interceptor{private final static Log log = LogFactory.getLog(PaginationInterceptor.class); Dialect dialect = new MySql5Dialect(); public Object intercept(Invocation invocation) throws Throwable {MappedStatement mappedStatement=(MappedStatement)invocation.getArgs()[0];Object parameter = invocation.getArgs()[1]; BoundSql boundSql = mappedStatement.getBoundSql(parameter); String originalSql = boundSql.getSql().trim(); RowBounds rowBounds = (RowBounds)invocation.getArgs()[2];Object parameterObject = boundSql.getParameterObject();if(boundSql==null || boundSql.getSql()==null || "".equals(boundSql.getSql()))return null;//分页参数--上下文传参Page page = null;PageContext context=PageContext.getContext();//map传参每次都将currentPage重置,先判读map再判断contextif(parameterObject!=null)page = (Page)ReflectHelper.isPage(parameterObject,"page");//分页参数--context参数里的Page传参if(page==null && context.isPagination()==true){page = context;}//后面用到了context的东东if(page!=null && page.isPagination()==true) { int totpage=page.getTotalRows(); //得到总记录数 if (totpage==0){StringBuffer countSql = new StringBuffer(originalSql.length()+100 );countSql.append("select count(1) from (").append(originalSql).append(") t"); Connection connection=mappedStatement.getConfiguration().getEnvironment().getDataSource().getConnection() ; PreparedStatement countStmt = connection.prepareStatement(countSql.toString()); BoundSql countBS = new BoundSql(mappedStatement.getConfiguration(),countSql.toString(),boundSql.getParameterMappings(),parameterObject); setParameters(countStmt,mappedStatement,countBS,parameterObject); ResultSet rs = countStmt.executeQuery(); if (rs.next()) { totpage = rs.getInt(1); } rs.close(); countStmt.close(); connection.close();} //分页计算 page.init(totpage,page.getPageSize(),page.getCurrentPage()); if(rowBounds == null || rowBounds == RowBounds.DEFAULT){rowBounds= new RowBounds(page.getPageSize()*(page.getCurrentPage()-1),page.getPageSize());}//分页查询 本地化对象 修改数据库注意修改实现 String pagesql=dialect.getLimitString(originalSql, rowBounds.getOffset(), rowBounds.getLimit()); invocation.getArgs()[2] = new RowBounds(RowBounds.NO_ROW_OFFSET, RowBounds.NO_ROW_LIMIT); BoundSql newBoundSql = new BoundSql(mappedStatement.getConfiguration(), pagesql,boundSql.getParameterMappings(),boundSql.getParameterObject()); MappedStatement newMs = copyFromMappedStatement(mappedStatement,new BoundSqlSqlSource(newBoundSql)); invocation.getArgs()[0]= newMs; } return invocation.proceed();}public static class BoundSqlSqlSource implements SqlSource { BoundSql boundSql; public BoundSqlSqlSource(BoundSql boundSql) { this.boundSql = boundSql; } public BoundSql getBoundSql(Object parameterObject) { return boundSql; } } public Object plugin(Object arg0) { return Plugin.wrap(arg0, this);}public void setProperties(Properties arg0) { } /** * 对SQL参数(?)设值,参考org.apache.ibatis.executor.parameter.DefaultParameterHandler * @param ps * @param mappedStatement * @param boundSql * @param parameterObject * @throws SQLException */ private void setParameters(PreparedStatement ps,MappedStatement mappedStatement,BoundSql boundSql,Object parameterObject) throws SQLException { ErrorContext.instance().activity("setting parameters").object(mappedStatement.getParameterMap().getId()); List<ParameterMapping> parameterMappings = boundSql.getParameterMappings(); if (parameterMappings != null) { Configuration configuration = mappedStatement.getConfiguration(); TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry(); MetaObject metaObject = parameterObject == null ? null: configuration.newMetaObject(parameterObject); for (int i = 0; i < parameterMappings.size(); i++) { ParameterMapping parameterMapping = parameterMappings.get(i); if (parameterMapping.getMode() != ParameterMode.OUT) { Object value; String propertyName = parameterMapping.getProperty(); PropertyTokenizer prop = new PropertyTokenizer(propertyName); if (parameterObject == null) { value = null; } else if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) { value = parameterObject; } else if (boundSql.hasAdditionalParameter(propertyName)) { value = boundSql.getAdditionalParameter(propertyName); } else if (propertyName.startsWith(ForEachSqlNode.ITEM_PREFIX)&& boundSql.hasAdditionalParameter(prop.getName())) { value = boundSql.getAdditionalParameter(prop.getName()); if (value != null) { value = configuration.newMetaObject(value).getValue(propertyName.substring(prop.getName().length())); } } else { value = metaObject == null ? null : metaObject.getValue(propertyName); } TypeHandler typeHandler = parameterMapping.getTypeHandler(); if (typeHandler == null) { throw new ExecutorException("There was no TypeHandler found for parameter "+ propertyName + " of statement "+ mappedStatement.getId()); } typeHandler.setParameter(ps, i + 1, value, parameterMapping.getJdbcType()); } } } } private MappedStatement copyFromMappedStatement(MappedStatement ms, SqlSource newSqlSource) { Builder builder = new MappedStatement.Builder(ms.getConfiguration(), ms.getId(), newSqlSource, ms.getSqlCommandType()); builder.resource(ms.getResource()); builder.fetchSize(ms.getFetchSize()); builder.statementType(ms.getStatementType()); builder.keyGenerator(ms.getKeyGenerator()); builder.keyProperty(ms.getKeyProperty()); builder.timeout(ms.getTimeout()); builder.parameterMap(ms.getParameterMap()); builder.resultMaps(ms.getResultMaps()); builder.cache(ms.getCache()); MappedStatement newMs = builder.build(); return newMs; } }简要说明:刚刚忘记了,有一些查询操作是不需要分页的。可以自行修改拦截器中代码部分,加个判断啥的。
5:spring 配置
- <bean id="paginationInterceptor" class="com.flydreamer.interceptor.PaginationInterceptor"></bean>
<bean id="paginationInterceptor" class="com.flydreamer.interceptor.PaginationInterceptor"></bean>
- <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
- <property name="dataSource" ref="dataSource" />
- <property name="plugins">
- <ref bean="paginationInterceptor"/>
- </property>
- </bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="plugins"> <ref bean="paginationInterceptor"/> </property> </bean>
大致就是这样了。完整的可运行项目已放到这里。最近CSDN没有分了,收1分,各位童鞋见谅了~
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