<?php
namespace think\db;
use PDO;
use think\App;
use think\Cache;
use think\Collection;
use think\Config;
use think\Db;
use think\db\exception\BindParamException;
use think\db\exception\DataNotFoundException;
use think\db\exception\ModelNotFoundException;
use think\Exception;
use think\exception\DbException;
use think\exception\PDOException;
use think\Loader;
use think\Model;
use think\model\Relation;
use think\model\relation\OneToOne;
use think\Paginator;
class Query
{
// 数据库Connection对象实例
protected $connection;
// 数据库Builder对象实例
protected $builder;
// 当前模型类名称
protected $model;
// 当前数据表名称(含前缀)
protected $table = '';
// 当前数据表名称(不含前缀)
protected $name = '';
// 当前数据表主键
protected $pk;
// 当前数据表前缀
protected $prefix = '';
// 查询参数
protected $options = [];
// 参数绑定
protected $bind = [];
// 数据表信息
protected static $info = [];
// 回调事件
private static $event = [];
// 读取主库
private static $readMaster = [];
/**
* 构造函数
* @access public
* @param Connection $connection 数据库对象实例
* @param Model $model 模型对象
*/
public function __construct(Connection $connection = null, $model = null)
{
$this->connection = $connection ?: Db::connect([], true);
$this->prefix = $this->connection->getConfig('prefix');
$this->model = $model;
// 设置当前连接的Builder对象
$this->setBuilder();
}
/**
* 利用__call方法实现一些特殊的Model方法
* @access public
* @param string $method 方法名称
* @param array $args 调用参数
* @return mixed
* @throws DbException
* @throws Exception
*/
public function __call($method, $args)
{
if (strtolower(substr($method, 0, 5)) == 'getby') {
// 根据某个字段获取记录
$field = Loader::parseName(substr($method, 5));
$where[$field] = $args[0];
return $this->where($where)->find();
} elseif (strtolower(substr($method, 0, 10)) == 'getfieldby') {
// 根据某个字段获取记录的某个值
$name = Loader::parseName(substr($method, 10));
$where[$name] = $args[0];
return $this->where($where)->value($args[1]);
} else {
throw new Exception('method not exist:' . __CLASS__ . '->' . $method);
}
}
/**
* 获取当前的数据库Connection对象
* @access public
* @return Connection
*/
public function getConnection()
{
return $this->connection;
}
/**
* 切换当前的数据库连接
* @access public
* @param mixed $config
* @return $this
*/
public function connect($config)
{
$this->connection = Db::connect($config);
$this->setBuilder();
$this->prefix = $this->connection->getConfig('prefix');
return $this;
}
/**
* 设置当前的数据库Builder对象
* @access protected
* @return void
*/
protected function setBuilder()
{
$class = $this->connection->getBuilder();
$this->builder = new $class($this->connection, $this);
}
/**
* 获取当前的模型对象实例
* @access public
* @return Model|null
*/
public function getModel()
{
return $this->model;
}
/**
* 设置后续从主库读取数据
* @access public
* @param bool $allTable
* @return void
*/
public function readMaster($allTable = false)
{
if ($allTable) {
$table = '*';
} else {
$table = isset($this->options['table']) ? $this->options['table'] : $this->getTable();
}
static::$readMaster[$table] = true;
return $this;
}
/**
* 获取当前的builder实例对象
* @access public
* @return Builder
*/
public function getBuilder()
{
return $this->builder;
}
/**
* 指定默认的数据表名(不含前缀)
* @access public
* @param string $name
* @return $this
*/
public function name($name)
{
$this->name = $name;
return $this;
}
/**
* 指定默认数据表名(含前缀)
* @access public
* @param string $table 表名
* @return $this
*/
public function setTable($table)
{
$this->table = $table;
return $this;
}
/**
* 得到当前或者指定名称的数据表
* @access public
* @param string $name
* @return string
*/
public function getTable($name = '')
{
if ($name || empty($this->table)) {
$name = $name ?: $this->name;
$tableName = $this->prefix;
if ($name) {
$tableName .= Loader::parseName($name);
}
} else {
$tableName = $this->table;
}
return $tableName;
}
/**
* 将SQL语句中的__TABLE_NAME__字符串替换成带前缀的表名(小写)
* @access public
* @param string $sql sql语句
* @return string
*/
public function parseSqlTable($sql)
{
if (false !== strpos($sql, '__')) {
$prefix = $this->prefix;
$sql = preg_replace_callback("/__([A-Z0-9_-]+)__/sU", function ($match) use ($prefix) {
return $prefix . strtolower($match[1]);
}, $sql);
}
return $sql;
}
/**
* 执行查询 返回数据集
* @access public
* @param string $sql sql指令
* @param array $bind 参数绑定
* @param boolean $master 是否在主服务器读操作
* @param bool|string $class 指定返回的数据集对象
* @return mixed
* @throws BindParamException
* @throws PDOException
*/
public function query($sql, $bind = [], $master = false, $class = false)
{
return $this->connection->query($sql, $bind, $master, $class);
}
/**
* 执行语句
* @access public
* @param string $sql sql指令
* @param array $bind 参数绑定
* @return int
* @throws BindParamException
* @throws PDOException
*/
public function execute($sql, $bind = [])
{
return $this->connection->execute($sql, $bind, $this);
}
/**
* 获取最近插入的ID
* @access public
* @param string $sequence 自增序列名
* @return string
*/
public function getLastInsID($sequence = null)
{
return $this->connection->getLastInsID($sequence);
}
/**
* 获取最近一次查询的sql语句
* @access public
* @return string
*/
public function getLastSql()
{
return $this->connection->getLastSql();
}
/**
* 执行数据库事务
* @access public
* @param callable $callback 数据操作方法回调
* @return mixed
*/
public function transaction($callback)
{
return $this->connection->transaction($callback);
}
/**
* 启动事务
* @access public
* @return void
*/
public function startTrans()
{
$this->connection->startTrans();
}
/**
* 用于非自动提交状态下面的查询提交
* @access public
* @return void
* @throws PDOException
*/
public function commit