ThinkPHP5聯合(關聯)查詢、多條件查詢與彙總查詢執行個體詳解

這篇文章主要介紹了ThinkPHP5聯合(關聯)查詢、多條件查詢與彙總查詢,結合執行個體形式總結分析了thinkPHP5常用查詢操作技巧,需要的朋友可以參考下

本文執行個體講述了ThinkPHP5聯合(關聯)查詢、多條件查詢與彙總查詢。分享給大家供大家參考，具體如下：

一、聯合(關聯)查詢

1. 項目表

DROP TABLE IF EXISTS `darling_project`;CREATE TABLE `darling_project` ( `project_id` int(32) NOT NULL AUTO_INCREMENT, `project_name` varchar(20) NOT NULL, `create_time` int(32) NOT NULL, PRIMARY KEY (`project_id`), UNIQUE KEY `project_id` (`project_id`), UNIQUE KEY `project_name` (`project_name`));

2. 版本號碼表

DROP TABLE IF EXISTS `darling_version`;CREATE TABLE `darling_version` ( `version_id` int(32) NOT NULL AUTO_INCREMENT, `project_id` int(32) NOT NULL, `version_name` varchar(128) NOT NULL, `create_time` int(32) NOT NULL, PRIMARY KEY (version_id), UNIQUE KEY `version_id` (`version_id`));

3. 聯集查詢

$where=array(  "version_id"=>$_POST['version_id']);$Project_version = model('Project')->join("darling_version","darling_version.project_id = darling_project.project_id")->where($where)->find();

二、多條件查詢

方法一：

把查詢條件放到數組裡作為where函數參數，但是如果有大於小於這樣的條件參數，數組裡是無法賦值的。

例1：

$where=array(  "version_name"=>$version_name,  "project_name"=>$project_name);$userdata=$this->where($where)->find();

例2：

$where=array(   "version_name"=>$version_name,   "project_name"=>$project_name);$userdata=$this->where($where)->select();

例3：

$where=array(  "version_id"=>$version_id);$version_name = model("Version")->where($where)->field("version_name")->find();

方法二：

把多個SQL查詢語句作為where 參數，這樣就支援大於小於這樣的條件了。

$package = model('admin/Package')->where("project_id=".$Project_version['project_id']." and version_id=".$Project_version['version_id']." and status>1")->order('create_time desc')->find();

方法三：

把SQL查詢語句放到多個where函數裡

$package = model('admin/Package')->where("project_id=".$Project_version['project_id'])->where("version_id=".$Project_version['version_id'])->where("status>1")->order('create_time desc')->find();

三、彙總max 函數

1. 如下可以返還最新插入的升級包，但是只會返還create_time 這個欄位，不能返回整條記錄的欄位。

$package = model('admin/Package')->where("project_id=".$Project_version['project_id'])->where("version_id=".$Project_version['version_id'])->where("status>1")->max(create_time)

2. 所以可以使用下面這個達到找出最新插入的記錄並返還整條記錄欄位，先做order 排序，再find第一個記錄。

$package = model('admin/Package')->where("project_id=".$Project_version['project_id'])->where("version_id=".$Project_version['version_id'])->where("status>1")->order('create_time desc')->find();