Oracle解析复杂json的方法实例详解

--向数据库导入json相关jar包
loadjava -r -f -u scott/tiger@xxx.xxx.xxx.xxx:1521/orcl json.jar
--删除指定jar
#dropjava -u scott/tiger@xxx.xxx.xxx.xxx:1521/orcl json.jar

create or replace and compile java source named "JsonUtil" as
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.lang.Integer;
public class JsonUtil {
 //取json串单个节点值
 public static String getValue(String jsonStr,String nodeName){
 String nodeValue="";
 try {
  if(jsonStr==null||!jsonStr.startsWith("{")||!jsonStr.endsWith("}")){
  nodeValue="";
  }else{
  JSONObject obj =new JSONObject(jsonStr);
  nodeValue = obj.getString(nodeName);
  }
 } catch (JSONException e) {
  nodeValue="";
 }
 return nodeValue;
 }
 //取json数组长度便于循环处理
 public static Integer getArrayLength(String jsonArrayStr){
 Integer length=0;
 try {
  if(jsonArrayStr==null||!jsonArrayStr.startsWith("[")||!jsonArrayStr.endsWith("]")){
  length=0;
  }else{
  JSONArray jsonArr = new JSONArray(jsonArrayStr);
  length=jsonArr.length();
  }
 } catch (JSONException e) {
  length=0;
 }
 return length;
 }
 //取json数组第index个元素
 public static String getArrayValue(String jsonStr,Integer index){
 String nodeValue="";
 try {
  if(jsonStr==null||!jsonStr.startsWith("[")||!jsonStr.endsWith("]")){
  nodeValue="";
  }else{
  JSONArray jsonArr = new JSONArray(jsonStr);
  nodeValue=jsonArr.getString(index);
  }
 } catch (JSONException e) {
  nodeValue="";
 }
 return nodeValue;
 }
}

create or replace package jsonpkg
as
function getval(jsonstr varchar2,nodename varchar2) return varchar2;
function getarrval(jsonArrayStr varchar2,seqNo number) return varchar2;
function getarrlen(jsonArrayStr varchar2) return number;
end jsonpkg;
/
create or replace package body jsonpkg
as
function getval(jsonstr varchar2,nodename varchar2) return varchar2
as language java name 'JsonUtil.getValue(java.lang.String,java.lang.String) return java.lang.String';
function getarrval(jsonArrayStr varchar2,seqNo number) return varchar2
as language java name 'JsonUtil.getArrayValue(java.lang.String, java.lang.Integer) return java.lang.String';
function getarrlen(jsonArrayStr varchar2) return number
as language java name 'JsonUtil.getArrayLength(java.lang.String) return java.lang.Integer';
end jsonpkg;
/