TP5打印查看sql语句的几种方式

获取sql语句 用于调试、排错、优化

• getLastSql

    $res = Db::table('staff')->field('id,salary')->where('id','>',1)
                ->group('salary')->having('salary > 5000')->select();
    $sql = Db::table('staff')->getLastSql();
    halt($sql);

• select(false)

$res = Db::table('staff')->field('id,salary')->where('id','>',1)
            ->group('salary')->having('salary > 5000')->select(false);
halt($res);

• fetchSql

$res = Db::table('staff')->field('id,salary')->where('id','>',1)
            ->group('salary')->having('salary > 5000')->fetchSql()->select();
halt($res);

• buildSql

$res = Db::table('staff')->field('id,salary')->where('id','>',1)
            ->group('salary')->having('salary > 5000')->buildSql();
halt($res);

• 监听sql

Db::listen(function($sql, $time, $explain){
    
    
    // 记录SQL
    echo $sql. ' ['.$time.'s]';
    // 查看性能分析结果
    dump($explain);
});