本文實例講述了ThinkPHP5聯合(關聯)查詢、多條件查詢與聚合查詢。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. 聯合查詢
$where=array( "version_id"=>$_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里作為where函數參數，但是如果有大于小于這樣的條件參數，數組里是無法賦值的。
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，這樣就支持大于小于這樣的條件了。
$package = model('admin/Package')->where("project_id=".$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函數里
$package = model('admin/Package')->where("project_id=".$Project_version['project_id'])->where("version_id=".$Project_version['version_id'])->where("status>1")->order('create_time desc')->find();三、聚合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 這個字段，不能返回整條記錄的字段。
$package = model('admin/Package')->where("project_id=".$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并返還整條記錄字段，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();
希望本文所述對大家基于ThinkPHP框架的PHP程序設計有所幫助。
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