sql查询增加分页功能

@@ -131,10 +131,6 @@ public class SqlOperateServiceImpl implements SqlOperateService {
         if(sql.endsWith(";")){
             sql = sql.substring(0,sql.length()-1);
         }
-        /*boolean descOrShowFlag=false;
-        if(sql.toLowerCase().startsWith("desc ")||sql.toLowerCase().startsWith("show ")){
-            descOrShowFlag=true;
-        }*/
 
         log.info("query4Table begin "+sql);
 
@@ -147,9 +143,12 @@ public class SqlOperateServiceImpl implements SqlOperateService {
         }
         int count =0;
         Connection con = null;
-        //PreparedStatement ps = null;
+        boolean selectFlag=false;
         Statement st = null;
         ResultSet rs = null;
+
+        Statement st_pi = null;
+        ResultSet rs_pi = null;
         try {
             String dbUrl="jdbc:mysql://" + sqlOperateModel.getDataSourceInfo() ;
             if(StringUtils.isNotBlank(sqlOperateModel.getDbInfo())){
@@ -160,14 +159,30 @@ public class SqlOperateServiceImpl implements SqlOperateService {
 
             con = DriverManager.getConnection(dbUrl, sqlOperateModel.getDataSourceUser(), sqlOperateModel.getDataSourcePwd());
 
+            if(sql.toLowerCase().startsWith("select ")){
+                selectFlag=true;
+                rtnList.put("showPi",true);
+                rtnList.put("pageSizePi",MAX_QUERY_RESULT_COUNT);
+                rtnList.put("currentPagePi",sqlOperateModel.getCurrentPage());
+                st_pi = con.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
+                st_pi.setFetchSize(1);
+                st_pi.setMaxRows(1);
+                rs_pi = st_pi.executeQuery(" select count(1) from ( "+sql+" ) _tmp_sqloeaer_49_cnt ");
+                while (rs_pi.next()) {
+                    rtnList.put("totalPi",rs_pi.getInt(1));
+                }
+            }else{
+                rtnList.put("showPi",false);
+            }
+
             st = con.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
             st.setFetchSize(FETCH_COUNT_FROM_MYSQL);
             //不是desc的查询需要限定数量了
             //前台有了分页，不再需要设定desc的限定数量
-            //if(!descOrShowFlag){
+            if(selectFlag){
                 st.setMaxRows(MAX_QUERY_RESULT_COUNT*sqlOperateModel.getCurrentPage() +FETCH_COUNT_FROM_MYSQL);
-           // }
-            //st.setMaxRows(FETCH_COUNT_FROM_MYSQL);
+            }
+
             rs = st.executeQuery(sql);
             rs.beforeFirst();
             rs.relative(MAX_QUERY_RESULT_COUNT*sqlOperateModel.getCurrentPage());
@@ -221,8 +236,8 @@ public class SqlOperateServiceImpl implements SqlOperateService {
             }
             while (rs.next()) {
                 times++;
-                //if(!descOrShowFlag&&times>MAX_QUERY_RESULT_COUNT){
-                if(times>MAX_QUERY_RESULT_COUNT){
+                if(selectFlag&&times>MAX_QUERY_RESULT_COUNT){
+                //if(times>MAX_QUERY_RESULT_COUNT){
                     queryDescr="数据量超过限制，本页只显示"+MAX_QUERY_RESULT_COUNT+"条";
                     hasNext="yes";
                     break;
@@ -282,6 +297,20 @@ public class SqlOperateServiceImpl implements SqlOperateService {
                 log.error("sqlOperateServiceImpl query4Table finally 关闭resultset异常:[" +sqlOperateModel.getQueryContent(),"sql="+sql+"]",e);
             }
             try {
+                if(rs_pi!=null){
+                    rs_pi.close();
+                }
+            } catch (SQLException e) {
+                log.error("sqlOperateServiceImpl query4Table finally 关闭resultset_pi异常:[" +sqlOperateModel.getQueryContent(),"sql="+sql+"]",e);
+            }
+            try {
+                if(st_pi!=null){
+                    st_pi.close();
+                }
+            } catch (SQLException e) {
+                log.error("sqlOperateServiceImpl query4Table finally 关闭Statement_pi异常:[" + sqlOperateModel.getQueryContent(), "sql=" + sql + "]", e);
+            }
+            try {
                 if(st!=null){
                     st.close();
                 }