JqGrid multipleSearch 及 后台根据 request 自动组装Where条件

jqGrid 高级查询方法：

 

$('#trans_asearch').click(function(){
    jQuery("#trans_lst").jqGrid('searchGrid',{multipleSearch:true});
});

 

 

向后台提交的请求为如下形式：

filters:{"groupOp":"OR","rules":[{"field":"startTime","op":"le","data":"2011-08-09"},{"field":"startTime","op":"ge","data":"2011-08-01"},{"field":"orderCode","op":"cn","data":"201108"}]}

 

后台组装处理类：

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package com.swind.tools;

import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import java.util.HashMap;
import java.util.Map;

/**
 *
 * @author WangXiaoping
 */
public class SqlTools {

    public interface CallBack {//回调函数接口
        public String executeData(String f,String o,String d);
        public String executeField(String f);
    }

    private static Map<String, String> Q2Oper;

    public SqlTools() {
        Q2Oper = new HashMap();
        //['eq','ne','lt','le','gt','ge','bw','bn','in','ni','ew','en','cn','nc']
        Q2Oper.put("eq", " = ");
        Q2Oper.put("ne", " <> ");
        Q2Oper.put("lt", " < ");
        Q2Oper.put("le", " <= ");
        Q2Oper.put("gt", " > ");
        Q2Oper.put("ge", " >= ");
        Q2Oper.put("bw", " LIKE ");
        Q2Oper.put("bn", " NOT LIKE ");
        Q2Oper.put("in", " IN ");
        Q2Oper.put("ni", " NOT IN ");
        Q2Oper.put("ew", " LIKE ");
        Q2Oper.put("en", " NOT LIKE ");
        Q2Oper.put("cn", " LIKE ");
        Q2Oper.put("nc", " NOT LIKE ");
    }

    public String constructWhere(String filter,CallBack cb) {
        String query="";
        if (!filter.isEmpty()) {
            JsonObject jsono = new JsonParser().parse(filter).getAsJsonObject();
            if (jsono.isJsonObject()) {
                String group = jsono.get("groupOp").getAsString();
                JsonElement rules = jsono.get("rules");
                int i = 0;
                for (JsonElement o : rules.getAsJsonArray()) {
                    String field = o.getAsJsonObject().get("field").getAsString();
                    String op = o.getAsJsonObject().get("op").getAsString();
                    String data = o.getAsJsonObject().get("data").getAsString();
                    if (!op.isEmpty() && !data.isEmpty()) {
                        i++;
                        field = cb.executeField(field);
                        data = cb.executeData(field, op, data);
                        if(i==1)
                            query=" AND ";
                        else
                            query +=" "+group+" ";
                        if(op.equals("in")||op.equals("ni")){
                            query+= field+Q2Oper.get(op)+" ("+data+")";
                        } else {
                            query+= field+Q2Oper.get(op)+data;
                        }
                    }
                }
            }
        }
        return query;
    }

}

 

测试运行：

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package com.swind.test;

import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.swind.tools.SqlTools;
import com.swind.tools.SqlTools.CallBack;

/**
 *
 * @author WangXiaoping
 */
public class GsonTest {
    public static void main(String[] arg){
        String js = "{\"groupOp\":\"AND\",\"rules\":[{\"field\":\"deptName\",\"op\":\"cn\",\"data\":\"工\"},{\"field\":\"fromType\",\"op\":\"eq\",\"data\":\"TFI10\"}]}";

        String query = new SqlTools().constructWhere(js, new CallBack(){
            public String executeData(String f, String o, String d) {
                if(o.equals("bw") || o.equals("bn")) return "'" + d + "%'";
                else if (o.equals("ew") || o.equals("en")) return "'%"+d+"'";
                else if (o.equals("cn") || o.equals("nc")) return "'%" +d+ "%'";
                else return "'" +d+ "'";
            }
            public String executeField(String f) {
                if(f.equals("deptName"))return "o.short_name";
                else if(f.equals("fromType"))return "t.from_type";
                else if(f.equals("orderCode"))return "t.order_code";
                else if(f.equals("applicantName"))return "ta.fullname";
                else if(f.equals("transType"))return "t.trans_type";
                else if(f.equals("createTime"))return "t.create_time";
                else if(f.equals("startTime"))return "t.start_time";
                else if(f.equals("realFinishTime"))return "t.real_finish_time";
                else if(f.equals("status"))return "t.status";
                else return f;
            }
        });
        System.out.println(query);
    }

}