1、ibatis理解：
　　iBatis属于半自动化的ORM框架，我们需要编写SQL语句，由iBatis进行数据库访问，返回结果。而iBatis可以为我们做的更多，比如对查询参数集合、结果、分页查询、事务管理的封装等。虽然不如全自动SQL方便，但是SQL的主动权却在我们开发人员的手中，对SQL优化的掌控则是很直接的。
　　备注：iBatis的版本发展到3.0时，其名称也更改为MyBatis。而Spring更新到3.1都没有对MyBatis进行支持，但是MyBatis团队已经自行开发了Spring的支持。我们以Spring为主，仍然使用对iBatis2的支持来进行说明。

ibatis在线API教程可以参看  https://www.w3cschool.cn/ibatis/

2、jsp页面分页代码

  1.         <div align="right">
  2.             当前第<label class="page" id="currentpage" ></label>页/<label class="page" id="allSize" ></label>页
  3.  
  4.             <label id="first" style="display: inline;">首页 前一页</label>
  5.             <span id="first1" style="display: none;">
  6.                 <a  style="display: inline" onclick="javascript:seachPage('first')" href="##"  class="a1">首页</a>
  7.                 <a  onclick="javascript:seachPage('previous')" href="##"  class="a1">前一页</a>
  8.             </span>
  9.  
  10.             <label id="last" style="display: inline">后一页 末页</label>
  11.             <span id="last1" style="display: none;">
  12.                 <a onclick="javascript:seachPage('next')" href="##" class="a1">后一页</a>
  13.                 <a onclick="javascript:seachPage('last')" href="##"  class="a1">末页</a>
  14.             </span>
  15.             <input id="currentpagevalue" type="hidden" value="0">
  16.         </div>

3、JavaScript函数提交分页查询请求

  1. function seachPage(pageDirection) {
  2.     var currentpagevalue = $("#currentpagevalue").val();var custname = $("#custname").val();
  3.     initLoading();// 启动加载动画
  4.     $.post("DataAction.do?action=findAudiList",{
  5.                         pageDirection : pageDirection,
  6.                         currentPage : currentpagevalue,
  7.                         custName : encodeURI(custname)
  8.                     },
  9.                     function(data) {
  10.                         var arr = data[0].auditList;
  11.                         if (arr.length > 0) {
  12.                             var html = "";
  13.                             for ( var i = 0; i < arr.length; i++) {// 更新列表
  14.                                 var ReportBean = arr[i];
  15.                                 html += "<tr><td><input type='radio'  name='Reportid' value='" + ReportBean.Reportid + "'/>    </td>";
  16.                                 html += "<td align='center'>" + ReportBean.Reportid + "&nbsp;</td>";
  17.                                 html += "<td align='center'>" + ReportBean.custName + "&nbsp;</td>";
  18.                                 html += "<td align='center'>" + ReportBean.sbType + "&nbsp;</td>";
  19.                                 html += "<td align='center'>" + ReportBean.jyType + "&nbsp;</td>";
  20.                                 html += "<td align='center'>" + ReportBean.branchCode + "&nbsp;</td>";
  21.                                 html += "<td align='center'>" + ReportBean.branchName + "&nbsp;</td>";
  22.                                 html += "<td align='center'>" + ReportBean.exchStamp + "&nbsp;<input type='hidden' name='desc_reason' id='desc_reason' value='"+ ReportBean.exchStamp +"' /></td>";
  23.                                 html += "<td align='center'>" + ReportBean.exchType + "&nbsp;</td>";
  24.                                 html += "<td align='center'>" + ReportBean.timestamp + "&nbsp;</td>";
  25.                                 html += "<td align='center'>" + ReportBean.checkDate + "&nbsp;</td>";
  26.                                 html += "<td align='center'><input type='button' value='查看' onclick=SearchAudit('DataAuditAction.do?action=searchAuditDetail&insurCode="+ReportBean.Reportid+"')>" + "&nbsp;</td></tr>";
  27.                             }
  28.                             //
  29.                             var allsize = data[0].allSize;
  30.                             var currentpage = data[0].currentpage;
  31.                             cleartable(0);// 清空表格
  32.                             $("#tablelist").append(html);
  33.                             hideLoading();// 取消动画
  34.                             $("#allSize").append(data[0].allSize);
  35.                             $("#currentpage").append((parseInt(data[0].currentpage) + parseInt(1)));
  36.                             changePage(allsize, currentpage);// 更新翻页
  37.                             $("#currentpagevalue").val(currentpage);
  38.                         } else
  39.                             cleartable(0);
  40.                         hideLoading();// 取消动画
  41.  
  42.                     }, "json");
  43. }

4.ibatis分页查询

Action层

  1. import org.biframework.common.Tools;
  2. import org.biframework.dao.ibatis.Paper;
  3. Paper paper = new Paper();
  4. String pageDirection = Tools.nulltostring((String) request.getParameter("pageDirection"));
  5. String currentPage = request.getParameter("currentPage");
  6. List auditList = dataAuditService.getAuditAllDataList(map, paper, currentPage, pageDirection, 10);
  7. map.put("orgLevels", userBean.getOrgLevels());
  8.  
  9. map.put("auditList", auditList);
  10. map.put("currentpage", String.valueOf(paper.getCurrentpage()));
  11. map.put("allSize", String.valueOf(paper.getAllSize()));
  12. response.getWriter().write(JSONArray.fromObject(map).toString());
  13. response.getWriter().flush();
  14. response.getWriter().close();

dao层

  1. public class DataAuditDao extends BaseDao{
  2.     protected static Log log = LogFactory.getLog(DataAuditDao.class);
  3.     public List getAuditAllDataList(Map map,Paper paper,String currentPage,String pageDirection,int line) throws DaoException{
  4.         List list = super.getList("getAllAuditDataList", map);
  5.         return paper.getPaperList(list, pageDirection, currentPage,line);
  6.     }
  7. }

BaseDao

  1. package org.biframework.dao.ibatis;
  2.  
  3. import com.ibatis.common.util.PaginatedList;
  4. import java.io.PrintStream;
  5. import java.util.ArrayList;
  6. import java.util.List;
  7. import org.apache.commons.logging.Log;
  8. import org.apache.commons.logging.LogFactory;
  9. import org.biframework.exception.DaoException;
  10. import org.springframework.orm.ibatis.SqlMapClientTemplate;
  11. import org.springframework.orm.ibatis.support.SqlMapClientDaoSupport;
  12.  
  13. public class BaseDao
  14.   extends SqlMapClientDaoSupport
  15.   implements IBaseDao
  16. {
  17.   private static Log log = LogFactory.getLog(BaseDao.class);
  18.   protected static final int PAGE_SIZE = 15;
  19.  
  20.   public List getList(String statementName, Object parameterObject)
  21.     throws DaoException
  22.   {
  23.     List list = getSqlMapClientTemplate().queryForList(statementName, parameterObject);
  24.     return list;
  25.   }
  26.  
  27.   public List getListUseSameStmt(String statementName, Object[] objectParam)
  28.     throws DaoException
  29.   {
  30.     List list = null;
  31.     List temp = null;
  32.     if ((statementName == null) || (objectParam == null) || (objectParam.length == 0)) {
  33.       return list;
  34.     }
  35.     for (int i = 0; i < objectParam.length; i++)
  36.     {
  37.       if (list == null) {
  38.         list = new ArrayList();
  39.       }
  40.       temp = getSqlMapClientTemplate().queryForList(statementName, objectParam[i]);
  41.       if (temp != null) {
  42.         list.addAll(temp);
  43.       }
  44.     }
  45.     return list;
  46.   }
  47.  
  48.   public Object getObject(String statementName, Object parameterObject)
  49.     throws DaoException
  50.   {
  51.     Object result = null;
  52.  
  53.     List list = getSqlMapClientTemplate().queryForList(statementName, parameterObject);
  54.     if ((list != null) && (list.size() > 0)) {
  55.       result = list.get(0);
  56.     }
  57.     return result;
  58.   }
  59.  
  60.   public PaginatedList getPgntList(String statementName, Object parameterObject, String pageDirection)
  61.     throws DaoException
  62.   {
  63.     PaginatedList list = getSqlMapClientTemplate().queryForPaginatedList(statementName, parameterObject, 15);
  64.     if ("next".equals(pageDirection)) {
  65.       list.nextPage();
  66.     } else if ("previous".equals(pageDirection)) {
  67.       list.previousPage();
  68.     } else if ("first".equals(pageDirection)) {
  69.       list.isFirstPage();
  70.     } else if ("last".equals(pageDirection)) {
  71.       list.isLastPage();
  72.     }
  73.     return list;
  74.   }
  75.  
  76.   public PaginatedList getPgntList(String statementName, Object parameterObject, String pageDirection, int pageSize)
  77.     throws DaoException
  78.   {
  79.     PaginatedList list = getSqlMapClientTemplate().queryForPaginatedList(statementName, parameterObject, pageSize);
  80.     if ("next".equals(pageDirection))
  81.     {
  82.       System.out.println("下一页");
  83.       list.nextPage();
  84.     }
  85.     else if ("previous".equals(pageDirection))
  86.     {
  87.       System.out.println("上一页");
  88.       list.previousPage();
  89.     }
  90.     else if ("first".equals(pageDirection))
  91.     {
  92.       System.out.println("首页");
  93.       list.isFirstPage();
  94.     }
  95.     else if ("last".equals(pageDirection))
  96.     {
  97.       System.out.println("末页");
  98.       list.isLastPage();
  99.     }
  100.     return list;
  101.   }
  102.  
  103.   public int transUpdate(Object[][] statementAndparameter)
  104.     throws DaoException
  105.   {
  106.     Object[] statements = statementAndparameter[0];
  107.     Object[] parameters = statementAndparameter[1];
  108.     int result = 0;
  109.     for (int i = 0; i < statements.length; i++)
  110.     {
  111.       String name = (String)statements[i];
  112.       Object param = parameters[i];
  113.       result += getSqlMapClientTemplate().update(name, param);
  114.     }
  115.     return result;
  116.   }
  117.  
  118.   public int transUpdateSameOpt(String statementName, Object[] objectParam)
  119.     throws DaoException
  120.   {
  121.     int result = 0;
  122.     if ((statementName == null) || (objectParam == null) || (objectParam.length == 0)) {
  123.       return result;
  124.     }
  125.     for (int i = 0; i < objectParam.length; i++) {
  126.       result += getSqlMapClientTemplate().update(statementName, objectParam[i]);
  127.     }
  128.     return result;
  129.   }
  130.  
  131.   public int update(String statementName, Object parameterObject)
  132.     throws DaoException
  133.   {
  134.     int result = getSqlMapClientTemplate().update(statementName, parameterObject);
  135.     return result;
  136.   }
  137. }

接口IBaseDao

  1. package org.biframework.dao.ibatis;
  2.  
  3. import com.ibatis.common.util.PaginatedList;
  4. import java.util.List;
  5. import org.biframework.exception.DaoException;
  6.  
  7. public abstract interface IBaseDao
  8. {
  9.   public abstract Object getObject(String paramString, Object paramObject)
  10.     throws DaoException;
  11.  
  12.   public abstract List getList(String paramString, Object paramObject)
  13.     throws DaoException;
  14.  
  15.   public abstract PaginatedList getPgntList(String paramString1, Object paramObject, String paramString2)
  16.     throws DaoException;
  17.  
  18.   public abstract PaginatedList getPgntList(String paramString1, Object paramObject, String paramString2, int paramInt)
  19.     throws DaoException;
  20.  
  21.   public abstract List getListUseSameStmt(String paramString, Object[] paramArrayOfObject)
  22.     throws DaoException;
  23.  
  24.   public abstract int update(String paramString, Object paramObject)
  25.     throws DaoException;
  26.  
  27.   public abstract int transUpdateSameOpt(String paramString, Object[] paramArrayOfObject)
  28.     throws DaoException;
  29.  
  30.   public abstract int transUpdate(Object[][] paramArrayOfObject)
  31.     throws DaoException;
  32. }

DaoException

  1. package org.biframework.exception;
  2.  
  3. public class DaoException
  4.   extends Exception
  5. {
  6.   public DaoException() {}
  7.  
  8.   public DaoException(Throwable cause)
  9.   {
  10.     super(cause);
  11.   }
  12.  
  13.   public DaoException(String message)
  14.   {
  15.     super(message);
  16.   }
  17.  
  18.   public DaoException(String message, Throwable cause)
  19.   {
  20.     super(message, cause);
  21.   }
  22. }

Paper

  1. package org.biframework.dao.ibatis;
  2.  
  3. import java.util.ArrayList;
  4. import java.util.List;
  5. import org.apache.commons.logging.Log;
  6. import org.apache.commons.logging.LogFactory;
  7.  
  8. public class Paper
  9. {
  10.   public Paper()
  11.   {
  12.     this.currentpage = 0;
  13.     this.allSize = 0;
  14.   }
  15.  
  16.   public void getCurrentPageNum(List allList, String pageDirection, String _currentpage)
  17.   {
  18.     if ("next".equals(pageDirection))
  19.     {
  20.       if ((Integer.parseInt(_currentpage) + 1) * 20 < allList.size()) {
  21.         this.currentpage = (Integer.parseInt(_currentpage) + 1);
  22.       } else {
  23.         this.currentpage = Integer.parseInt(_currentpage);
  24.       }
  25.     }
  26.     else if ("previous".equals(pageDirection))
  27.     {
  28.       if (Integer.parseInt(_currentpage) - 1 <= 0) {
  29.         this.currentpage = 0;
  30.       } else {
  31.         this.currentpage = (Integer.parseInt(_currentpage) - 1);
  32.       }
  33.     }
  34.     else if ("first".equals(pageDirection)) {
  35.       this.currentpage = 0;
  36.     } else if ("last".equals(pageDirection))
  37.     {
  38.       if (allList.size() == 0) {
  39.         this.currentpage = 0;
  40.       } else if (allList.size() % 20 == 0) {
  41.         this.currentpage = (allList.size() / 20 - 1);
  42.       } else {
  43.         this.currentpage = (allList.size() / 20);
  44.       }
  45.     }
  46.     else {
  47.       this.currentpage = 0;
  48.     }
  49.   }
  50.  
  51.   public void getCurrentPageNum(List allList, String pageDirection, String _currentpage, int pageSize)
  52.   {
  53.     if ("next".equals(pageDirection))
  54.     {
  55.       if ((Integer.parseInt(_currentpage) + 1) * pageSize < allList.size()) {
  56.         this.currentpage = (Integer.parseInt(_currentpage) + 1);
  57.       } else {
  58.         this.currentpage = Integer.parseInt(_currentpage);
  59.       }
  60.     }
  61.     else if ("previous".equals(pageDirection))
  62.     {
  63.       if (Integer.parseInt(_currentpage) - 1 <= 0) {
  64.         this.currentpage = 0;
  65.       } else {
  66.         this.currentpage = (Integer.parseInt(_currentpage) - 1);
  67.       }
  68.     }
  69.     else if ("first".equals(pageDirection)) {
  70.       this.currentpage = 0;
  71.     } else if ("last".equals(pageDirection))
  72.     {
  73.       if (allList.size() == 0) {
  74.         this.currentpage = 0;
  75.       } else if (allList.size() % pageSize == 0) {
  76.         this.currentpage = (allList.size() / pageSize - 1);
  77.       } else {
  78.         this.currentpage = (allList.size() / pageSize);
  79.       }
  80.     }
  81.     else {
  82.       this.currentpage = 0;
  83.     }
  84.   }
  85.  
  86.   public List getPaperList(List allList, String pageDirection, String _currentpage)
  87.   {
  88.     getCurrentPageNum(allList, pageDirection, _currentpage);
  89.     List rsList = new ArrayList();
  90.     for (int i = this.currentpage * 20; i < (this.currentpage + 1) * 20; i++)
  91.     {
  92.       if (i == allList.size()) {
  93.         break;
  94.       }
  95.       rsList.add(allList.get(i));
  96.     }
  97.     if (allList.size() % 20 == 0) {
  98.       this.allSize = (allList.size() / 20);
  99.     } else {
  100.       this.allSize = (allList.size() / 20 + 1);
  101.     }
  102.     if (allList.size() == 0) {
  103.       this.allSize = 1;
  104.     }
  105.     return rsList;
  106.   }
  107.  
  108.   public List getPaperList(List allList, String pageDirection, String _currentpage, int pageSize)
  109.   {
  110.     getCurrentPageNum(allList, pageDirection, _currentpage, pageSize);
  111.     List rsList = new ArrayList();
  112.     for (int i = this.currentpage * pageSize; i < (this.currentpage + 1) * pageSize; i++)
  113.     {
  114.       if (i == allList.size()) {
  115.         break;
  116.       }
  117.       rsList.add(allList.get(i));
  118.     }
  119.     if (allList.size() % pageSize == 0) {
  120.       this.allSize = (allList.size() / pageSize);
  121.     } else {
  122.       this.allSize = (allList.size() / pageSize + 1);
  123.     }
  124.     if (allList.size() == 0) {
  125.       this.allSize = 1;
  126.     }
  127.     return rsList;
  128.   }
  129.  
  130.   public int getCurrentpage()
  131.   {
  132.     return this.currentpage;
  133.   }
  134.  
  135.   public void setCurrentpage(int currentpage)
  136.   {
  137.     this.currentpage = currentpage;
  138.   }
  139.  
  140.   private static Log log = LogFactory.getLog(Paper.class);
  141.   protected static final int PAGE_SIZE = 20;
  142.   private int currentpage;
  143.   private int allSize;
  144.  
  145.   public int getAllSize()
  146.   {
  147.     return this.allSize;
  148.   }
  149.  
  150.   public void setAllSize(int allSize)
  151.   {
  152.     this.allSize = allSize;
  153.   }
  154. }

sql：中无需使用分页查询

  1.      <select  id="getAllAuditDataList" resultMap="auditAllDataResult" parameterClass="map">
  2.         <![CDATA[
  3.            select distinct
  4.                     a.report_id,
  5.                 case when count(distinct b.cust_name)>1 then
  6.                    max(b.cust_name) || ' 等'
  7.                   else
  8.                    max(b.cust_name)
  9.                 end as cust_name,
  10.                 max(decode(a.tran_type,
  11.                        'N',
  12.                        '正常',
  13.                        'C',
  14.                        '改错')) as jy_type,
  15.                   max(a.exch_stamp || ' ' || a.action_desc) as desc,
  16.                   max(to_char(a.TIMESTAMP,'yyyy-MM-dd')) TIMESTAMP
  17.            from report a,customer b,exch c
  18.          group by a.report_id,b.cust_name
  19.          order by check_date desc NULLS LAST, cust_name
  20.         ]]>
  21.       </select>

如果还有不太清楚的地方可以参看另一篇博文： spring集成ibatis进行项目中dao层基类封装 https://www.cnblogs.com/jiarui-zjb/p/9534810.html

写的不清楚的地方，欢迎留言指出！！！

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