1，新建sqliteManager管理

<?php
class ZYSqliteManager
{

}  

2，设置数据库属性及创建单例

 //数据库
private $db;
//单例
static private $zysqlmanger;
//判断实例初始化次数
private  function __construct()
{

}
//单例初始化

/**
 * @return ZYSqliteManager
 */
static  public function  installSql(){
//        var_dump(isset(self::$zysqlmanger));

    //判断实例是否初始化
    if (!isset(self::$zysqlmanger)) {

        self::$zysqlmanger = new self();

        $sqlManager = ZYSqliteManager::installSql();
        $sqlManager ->openDataBase();
    }
    return self::$zysqlmanger;

}

//防止被重写
private  function  __clone()
{
    // TODO: Implement __clone() method.
}

3，打开数据库，默认在创建初始化单例时打开数据库

 //打开数据库
private  function openDataBase(){
    $this->db =  new SQLite3("/Users/xianhongzhang/Desktop/BRServiceDB.db");
    if ($this->db){

    }else{
        echo "fail";
    }
}

4，查询数据库

//查询数据库
/*
sqlstr  sql语句
keysArr 字段数据
 */
public  function zymanagerquery($sqlStr, $keysArr){

    $searchResult = $this->db->query($sqlStr);

    $arr = array();

//遍历查询结果
    while ($item = $searchResult->fetchArray()){

        $dataDic = array();
        for ($i = 0; $i < count($keysArr); $i ++){
            $key = $keysArr[$i];
            $dataDic[$key] = $item[$key];
        }
        $arr[] = $dataDic;
    };
    return $arr;

}

5，添加删除修改数据库

//添加 修改 删除 数据
public function zymanagerInserUpDelData($sqlStr){
    //添加数据  删除更新同样

    $result = $this->db->exec($sqlStr);
    return $result;
}

6，调用实例，新建一个php file作为接口类

  <?php

require_once "../ZYSql/ZYSqlmanager.php";
include "response.php";
$phone = $_GET["phone"];
$password = $_GET["password"];
$resultArr = array();
header('Content-Type:application/json');//这个类型声明非常关键
if (!$phone || !$password){
    $resultArr["code"] = 201;
   $resultArr["message"] = "phone or password is nil";
    echo json_encode($resultArr);
  return;
}
$sqlManager = ZYSqliteManager::installSql();
$keysArr = ["id","name","phone","nickname","sign","addr"];
$dataArr = $sqlManager->zymanagerquery("select *from     UserList",$keysArr);
$resultArr["data"] = $dataArr;
$resultArr["code"] = 200;
$resultArr["message"] = "success";
$result = json_encode($resultArr);
echo $result;
  ?>