mybatis分页效果实现代码
mybatis分页效果实现代码
本文为大家分享了mybatis分页效果展示的具体代码，供大家参考，具体内容如下
mybatis版本3.4以下
结构：
spring-mvc.xml
xmlns="http://springframework.org/schema/beans" xmlns:p="http://springframework.org/schema/p" xmlns:context="http://springframework.org/schema/context" xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans-4.3.xsd http://springframework.org/schema/context http://springframework.org/schema/context/spring-context-4.3.xsd">
xmlns="http://springframework.org/schema/beans"
xmlns:p="http://springframework.org/schema/p"
xmlns:context="http://springframework.org/schema/context"
xsi:schemaLocation="http://springframework.org/schema/beans
http://springframework.org/schema/beans/spring-beans-4.3.xsd
http://springframework.org/schema/context
http://springframework.org/schema/context/spring-context-4.3.xsd">
com.ij34.mybatis
applicationContext.xml
xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xmlns:context="http://springframework.org/schema/context" xsi:schemaLocation=" http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans-4.3.xsd http://springframework.org/schema/context http://springframework.org/schema/context/spring-context-4.3.xsd" default-autowire="byName" default-lazy-init="false">
xmlns:xsi="http://w3.org/2001/XMLSchema-instance"
xmlns:context="http://springframework.org/schema/context"
xsi:schemaLocation="
http://springframework.org/schema/beans
http://springframework.org/schema/beans/spring-beans-4.3.xsd
http://springframework.org/schema/context
http://springframework.org/schema/context/spring-context-4.3.xsd"
default-autowire="byName" default-lazy-init="false">
mybatis-config.xml
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
UserMapper.xml
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
select users.id,users.name,users.age,article.id aid,article.title,article.content from users,article
where users.id=article.userid and users.id=#{id}
select users.id,users.name,users.age,article.id aid,article.title,article.content from users,article
where users.id=article.userid and users.id=#{userid}
com.ij34.model
User.java
package com.ij34.model;
public class User {
private int id;
private String name;
private int age;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String toString() {
return "User [id=" + id + ", name=" + name + ", age=" + age + "]";
}
}
Article.java
package com.ij34.model;
public class Article {
private int id;
private User user;
private String title;
private String content;
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
UserMapper.java
package com.ij34.model;
import java.util.List;
import org.apache.ibatis.annotations.Param;
import com.ij34.pages.PageInfo;
public interface UserMapper {
public List
public List
}
com.ij34.pages
参考网上的分页插件
PageInfo.java
package com.ij34.pages;
import java.io.Serializable;
public class PageInfo implements Serializable {
private static final long serialVersionUID = 587754556498974978L;
//pagesize ，每一页显示多少
private int showCount = 9;
//总页数
private int totalPage;
//总记录数
private int totalResult;
//当前页数
private int currentPage;
//当前显示到的ID, 在mysql limit 中就是第一个参数.
private int currentResult;
private String sortField;
private String order;
public int getShowCount() {
return showCount;
}
public void setShowCount(int showCount) {
this.showCount = showCount;
}
public int getyDKHsUfWzTotalPage() {
return totalPage;
}
public void setTotalPage(int totalPage) {
this.totalPage = totalPage;
}
public int getTotalResult() {
return totalResult;
}
public void setTotalResult(int totalResult) {
this.totalResult = totalResult;
}
public int getCurrentPage() {
return currentPage;
}
public void setCurrentPage(int currentPage) {
this.currentPage = currentPage;
}
public int getCurrentResult() {
return currentResult;
}
public void setCurrentResult(int currentResult) {
this.currentResult = currentResult;
}
public String getSortField() {
return sortField;
}
public void setSortField(String sortField) {
this.sortField = sortField;
}
public String getOrder() {
return order;
}
public void setOrder(String order) {
this.order = order;
}
}
PagePlugin.java
@Intercepts({ @Signature(type = StatementHandler.class, method = "prepare", args = { Connection.class }) })
要用3.4以下版本，可以参考官方
package com.ij34.pages;
import java.lang.reflect.Field;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import javax.xml.bind.PropertyException;
import org.apache.ibatis.executor.ErrorContext;
import org.apache.ibatis.executor.ExecutorException;
import org.apache.ibatis.executor.statement.BaseStatementHandler;
import org.apache.ibatis.executor.statement.RoutingStatementHandler;
import org.apache.ibatis.executor.statement.StatementHandler;
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.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.scripting.xmltags.ForEachSqlNode;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.type.TypeHandler;
import org.apache.ibatis.type.TypeHandlerRegistry;
@Intercepts({ @Signature(type = StatementHandler.class, method = "prepare", args = { Connection.class }) })
public class PagePlugin implements Interceptor {
private static String dialect = "";
private static String pageSqlId = "";
@SuppressWarnings("unchecked")
public Object intercept(Invocation ivk) throws Throwable {
if (ivk.getTarget() instanceof RoutingStatementHandler) {
RoutingStatementHandler statementHandler = (RoutingStatementHandler) ivk
.getTarget();
BaseStatementHandler delegate = (BaseStatementHandler) ReflectHelper
.getValueByFieldName(statementHandler, "delegate");
MappedStatement mappedStatement = (MappedStatement) ReflectHelper
.getValueByFieldName(delegate, "mappedStatement");
if (mappedStatement.getId().matches(pageSqlId)) {
BoundSql boundSql = delegate.getBoundSql();
Object parameterObject = boundSql.getParameterObject();
if (parameterObject == null) {
throw new NullPointerException("parameterObject error");
} else {
Connection connection = (Connection) ivk.getArgs()[0];
String sql = boundSql.getSql();
String countSql = "select count(0) from (" + sql + ") myCount";
System.out.println("总数sql 语句:"+countSql);
PreparedStatement countStmt = connection
.prepareStatement(countSql);
BoundSql countBS = new BoundSql(
mappedStatement.getConfiguration(), countSql,
boundSql.getParameterMappings(), parameterObject);
setParameters(countStmt, mappedStatement, countBS,
parameterObject);
ResultSet rs = countStmt.executeQuery();
int count = 0;
if (rs.next()) {
count = rs.getInt(1);
}
rs.close();
countStmt.close();
PageInfo page = null;
if (parameterObject instanceof PageInfo) {
page = (PageInfo) parameterObject;
page.setTotalResult(count);
} else if(parameterObject instanceof Map){
Map
page = (PageInfo)map.get("page");
if(page == null)
page = new PageInfo();
page.setTotalResult(count);
}else {
Field pageField = ReflectHelper.getFieldByFieldName(
parameterObject, "page");
if (pageField != null) {
page = (PageInfo) ReflectHelper.getValueByFieldName(
parameterObject, "page");
if (page == null)
page = new PageInfo();
page.setTotalResult(count);
ReflectHelper.setValueByFieldName(parameterObject,
"page", page);
} else {
throw new NoSuchFieldException(parameterObject
.getClass().getName());
}
}
String pageSql = generatePageSql(sql, page);
System.out.println("page sql:"+pageSql);
ReflectHelper.setValueByFieldName(boundSql, "sql", pageSql);
}
}
}
return ivk.proceed();
}
private void setParameters(PreparedStatement ps,
MappedStatement mappedStatement, BoundSql boundSql,
Object parameterObject) throws SQLException {
ErrorContext.instance().activity("setting parameters")
.object(mappedStatement.getParameterMap().getId());
List
.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 String generatePageSql(String sql, PageInfo page) {
if (page != null && (dialect !=null || !dialect.equals(""))) {
StringBuffer pageSql = new StringBuffer();
if ("mysql".equals(dialect)) {
pageSql.append(sql);
pageSql.append(" limit " + page.getCurrentResult() + ","
+ page.getShowCount());
} else if ("oracle".equals(dialect)) {
pageSql.append("select * from (select tmp_tb.*,ROWNUM row_id from (");
pageSql.append(sql);
pageSql.append(") tmp_tb where ROWNUM<=");
pageSql.append(page.getCurrentResult() + page.getShowCount());
pageSql.append(") where row_id>");
pageSql.append(page.getCurrentResult());
}
return pageSql.toString();
} else {
return sql;
}
}
public Object plugin(Object arg0) {
// TODO Auto-generated method stub
return Plugin.wrap(arg0, this);
}
public void setProperties(Properties p) {
dialect = p.getProperty("dialect");
if (dialect ==null || dialect.equals("")) {
try {
throw new PropertyException("dialect property is not found!");
} catch (PropertyException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
pageSqlId = p.getProperty("pageSqlId");
if (dialect ==null || dialect.equals("")) {
try {
throw new PropertyException("pageSqlId property is not found!");
} catch (PropertyException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
ReflectHelper.java
package com.ij34.pages;
import java.lang.reflect.Field;
public class ReflectHelper {
public static Field getFieldByFieldName(Object obj, String fieldName) {
for (Class> superClass = obj.getClass(); superClass != Object.class; superClass = superClass
.getSuperclass()) {
try {
return superClass.getDeclaredField(fieldName);
} catch (NoSuchFieldException e) {
}
}
return null;
}
public static Object getValueByFieldName(Object obj, String fieldName)
throws SecurityException, NoSuchFieldException,
IllegalArgumentException, IllegalAccessException {
Field field = getFieldByFieldName(obj, fieldName);
Object value = null;
if(field!=null){
if (field.isAccessible()) {
value = field.get(obj);
} else {
field.setAccessible(true);
value = field.get(obj);
field.setAccessible(false);
}
}
return value;
}
public static void setValueByFieldName(Object obj, String fieldName,
Object value) throws SecurityException, NoSuchFieldException,
IllegalArgumentException, IllegalAccessException {
Field field = obj.getClass().getDeclaredField(fieldName);
if (field.isAccessible()) {
field.set(obj, value);
} else {
field.setAccessible(true);
field.set(obj, value);
field.setAccessible(false);
}
}
}
com.ij34.bean
package com.ij34.bean;
import java.util.List;
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.ij34.model.*;
import com.ij34.pages.PageInfo;
@Controller
@RequestMapping("/article")
public class Test {
@Autowired
UserMapper mapper;
@RequestMapping("/list")
public ModelAndView listall(HttpServletRequest request,HttpServletResponse response){
List
//制定视图，也就是list.jsp
ModelAndView mav=new ModelAndView("list");
mav.addObject("articles",articles);
return mav;
}
@RequestMapping("/pagelist")
public ModelAndView pageList(HttpServletRequest request,HttpServletResponse response){
int currentPage = request.getParameter("page")==null?1:Integer.parseInt(request.getParameter("page"));
int pageSize = 9;
if (currentPage<=1){
currentPage =1;
}
int currentResult = (currentPage-1) * pageSize;
System.out.println(request.getRequestURI());
System.out.println(request.getQueryString());
PageInfo page = new PageInfo();
page.setShowCount(pageSize);
page.setCurrentResult(currentResult);
List
System.out.println(page);
int totalCount = page.getTotalResult();
int lastPage=0;
if (totalCount % pageSize==0){
lastPage = totalCount % pageSize;
}
else{
lastPage =1+ totalCount / pageSize;
}
if (currentPage>=lastPage){
currentPage =lastPage;
}
String pageStr = "";
pageStr=String.format("上一页 下一页",
request.getRequestURI()+"?page="+(currentPage-1),request.getRequestURI()+"?page="+(currentPage+1) );
//制定视图，也就是list.jsp
ModelAndView mav=new ModelAndView("list");
mav.addObject("articles",articles);
mav.addObject("pageStr",pageStr);
return mav;
}
/* public ModelAndView show(){//@RequestParam 请求参数
List
ModelAndView mav=new ModelAndView("list");
mav.addObject("articles", articles);
return mav;
}*/
}
WebContent
web.xml
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> org.springframework.web.context.ContextCleanupListener
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
org.springframework.web.context.ContextCleanupListener
index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
list.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
结果
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