记录一下遇到的问题 java将json数据解析为sql语句

这样的json数据转换成sql语句

 

 

 解决办法

import java.util.Iterator;

import java.util.Set;
import java.util.Map.Entry;
 
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
 
public class Sql
{
    public static String parseSQL(String json)
    {
        JsonParser parser = new JsonParser();
        JsonObject obj = (JsonObject) parser.parse(json);;
        String table = obj.get("table").getAsString();
        String op_type = obj.get("op_type").getAsString();
        String sql = "";
        if("I".equals(op_type))
        {
            sql += "INSERT INTO " + table + " (";
            JsonObject after = (JsonObject) obj.get("after");
            Set<Entry<String, JsonElement>> entry = after.entrySet();
            Iterator<Entry<String, JsonElement>> it = entry.iterator();
            String vs = " values (";
            while(it.hasNext())
            {
                Entry<String, JsonElement> elem = it.next();
                String key = elem.getKey();
                String val = elem.getValue().toString();
                sql += key + ", ";
                vs += val + ", ";
            }
            sql = sql.replaceAll(",\\s*$", "");
            vs = vs.replaceAll(",\\s*$", "");
            sql += ") " + vs + ")";
        }
        else if("U".equals(op_type))
        {
            sql += "UPDATE " + table + " SET ";
            JsonObject after = (JsonObject) obj.get("after");
            Set<Entry<String, JsonElement>> entry = after.entrySet();
            Iterator<Entry<String, JsonElement>> it = entry.iterator();
            while(it.hasNext())
            {
                Entry<String, JsonElement> elem = it.next();
                String key = elem.getKey();
                String val = elem.getValue().toString();
                sql += key + "=" + val + ", ";
            }
            sql = sql.replaceAll(",\\s*$", "");
            sql += " WHERE ";
            after = (JsonObject) obj.get("before");
            entry = after.entrySet();
            it = entry.iterator();
            while(it.hasNext())
            {
                Entry<String, JsonElement> elem = it.next();
                String key = elem.getKey();
                String val = elem.getValue().toString();
                sql += key + "=" + val + " AND ";
            }
            sql = sql.replaceAll("\\s*AND\\s*$", "");
        }
        else if("D".equals(op_type))
        {
            sql += "DELETE FROM " + table + " WHERE ";
            JsonObject after = (JsonObject) obj.get("before");
            Set<Entry<String, JsonElement>> entry = after.entrySet();
            Iterator<Entry<String, JsonElement>> it = entry.iterator();
            while(it.hasNext())
            {
                Entry<String, JsonElement> elem = it.next();
                String key = elem.getKey();
                String val = elem.getValue().toString();
                sql += key + "=" + val + " AND ";
            }
            sql = sql.replaceAll("\\s*AND\\s*$", "");
        }
        return sql;
    }

 

 测试

public static void main(String[] args)
    {
        String insert =
                "{\"table\":\"GG.TCUSTORD\",\"op_type\":\"I\",\"op_ts\":\"2013-06-02 22:14:36.000000\",\"current_ts\":\"2015-09-18T13:39:35.447000\",\"pos\":\"00000000000000001444\",\"tokens\":{\"R\":\"AADPkvAAEAAEqL2AAA\"},\"after\":{\"CUST_CODE\":\"WILL\",\"ORDER_DATE\":\"1994-09-30:15:33:00\",\"PRODUCT_CODE\":\"CAR\",\"ORDER_ID\":\"144\",\"PRODUCT_PRICE\":17520.00,\"PRODUCT_AMOUNT\":3,\"TRANSACTION_ID\":\"100\"}}";
        String update =
                "{\"table\":\"GG.TCUSTORD\",\"op_type\":\"U\",\"op_ts\":\"2013-06-02 22:14:41.000000\",\"current_ts\":\"2015-09-18T13:39:35.748000\",\"pos\":\"00000000000000002891\",\"tokens\":{\"L\":\"206080450\",\"6\":\"9.0.80330\",\"R\":\"AADPkvAAEAAEqLzAAC\"},\"before\":{\"CUST_CODE\":\"BILL\",\"ORDER_DATE\":\"1995-12-31:15:00:00\",\"PRODUCT_CODE\":\"CAR\",\"ORDER_ID\":\"765\",\"PRODUCT_PRICE\":15000.00,\"PRODUCT_AMOUNT\":3,\"TRANSACTION_ID\":\"100\"},\"after\":{\"CUST_CODE\":\"BILL\",\"ORDER_DATE\":\"1995-12-31:15:00:00\",\"PRODUCT_CODE\":\"CAR\",\"ORDER_ID\":\"765\",\"PRODUCT_PRICE\":14000.00,\"PRODUCT_AMOUNT\":3,\"TRANSCATION_ID\":\"100\"}}";
        String delete =
                "{\"table\":\"GG.TCUSTORD\",\"op_type\":\"D\",\"op_ts\":\"2013-06-02 22:14:41.000000\",\"current_ts\":\"2015-09-18T13:39:35.766000\",\"pos\":\"00000000000000004338\",\"tokens\":{\"L\":\"206080450\",\"6\":\"9.0.80330\",\"R\":\"AADPkvAAEAAEqLzAAC\"},\"before\":{\"CUST_CODE\":\"DAVE\",\"ORDER_DATE\":\"1993-11-03:07:51:35\",\"PRODUCT_CODE\":\"PLANE\",\"ORDER_ID\":\"600\"}}";
        System.out.println(parseSQL(insert));
        System.out.println(parseSQL(update));
        System.out.println(parseSQL(delete));
    }
}

 

 

 

转自 https://zhidao.baidu.com/question/1610138102391492667.html

侵删