package com.whyc.service;

import com.whyc.mapper.CallBack;
import com.whyc.util.ThreadLocalUtil;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.List;

@Service
public class MybatisSqlExecuteService {
    @Autowired
    private SqlSessionTemplate sqlSessionTemplate;

    //    自定义执行SQL
    public JSONArray executeQuery(String sql){
        PreparedStatement ps = null;
        ResultSet rs = null;
        SqlSession sqlSession = openSession();
        JSONArray jsonArray = new JSONArray();
        try {
            ps=sqlSession.getConnection().prepareStatement(sql);
            rs=ps.executeQuery();
            ResultSetMetaData metaData = rs.getMetaData();
            int colCnt = metaData.getColumnCount();
            while (rs.next()) {
                JSONObject jsonObject = new JSONObject();
                for(int i=1;i<=colCnt;i++){
                    String property=metaData.getColumnName(i);
                    Object obj=rs.getObject(i);
                    if(obj instanceof java.util.Date ){
                        //jsonObject.put(property, ActionUtil.sdf.format(obj));
                        jsonObject.put(property, ThreadLocalUtil.format((java.util.Date) obj,1));
                    }else{
                        jsonObject.put(property,obj);
                    }
                }
                JSONObject.toBean(jsonObject,Object.class);
                jsonArray.add(jsonObject);
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            closeSession(rs,ps,sqlSession);
        }
        return jsonArray;
    }

    //    自定义执行SQL
    public List executeQuery_call(String sql, CallBack call){
        PreparedStatement ps = null;
        ResultSet rs = null;
        SqlSession sqlSession = openSession();
        try {
            ps=sqlSession.getConnection().prepareStatement(sql);
            rs=ps.executeQuery();
            return call.getResults(rs);
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            closeSession(rs,ps,sqlSession);
        }
        return null;
    }

    /**
     * 封装所有更新的操作(添加,删除,修改)
     * @param sql
     * @param values
     * @return
     */
    public  int executeUpdate(String sql, Object[] values){
        PreparedStatement ps = null;
        ResultSet rs = null;
        SqlSession sqlSession = openSession();
        int flag=0;
        try {
            ps = sqlSession.getConnection().prepareStatement(sql);
            if(values != null){
                for (int i = 0; i < values.length; i++) {
                    ps.setObject(i+1, values[i]);
                }
            }
            flag =  ps.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }finally{
            closeSession(rs,ps,sqlSession);
        }
        return flag;
    }
    //执行sql语句
    public  boolean execute(String sql){
        PreparedStatement ps = null;
        SqlSession sqlSession = openSession();
        boolean rest = true;
        try{
                ps = sqlSession.getConnection().prepareStatement(sql);
                ps.execute();

        }catch(SQLException ex) {
            ex.printStackTrace();
            rest = false;
        }finally {
            closeSession(null,ps,sqlSession);
        }

        return rest;
    }
    //    开启链接
    private SqlSession openSession() {
        SqlSessionFactory sqlSessionFactory = sqlSessionTemplate.getSqlSessionFactory();
        return sqlSessionFactory.openSession();
    }

    //    关闭链接
    private void closeSession(ResultSet rs,PreparedStatement ps,SqlSession sqlSession) {
        try {
            if(rs!=null){
                rs.close();
            }
            if(ps!=null){
                ps.close();
            }
            if(sqlSession!=null){
                sqlSession.close();
            }

        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
    }
}