PHP code example of myqee / database

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

myqee / database example snippets

$db = DB::instance();
$name = "test'abc";       // 注意这个字符串带单引号'的
$rs = $db->from('mytable')->orderBy('id', 'DESC')->where('id', 10, '>')->limit(100)->where('name', $name)->get();
foreach($rs as $item)
{
    print_r($item);
}

use \MyQEE\Database\DB;
    
$db1 = DB::instance();
$db2 = DB::instance();
$db3 = DB::instance('test');
$db4 = DB::instance('test');
$db5 = new DB();
    
var_dump($db1 === $db2);   //bool(true) 
var_dump($db3 === $db4);   //bool(true) 
var_dump($db1 === $db3);   //bool(false) 
var_dump($db1 === $db5);   //bool(false) 

use \MyQEE\Database\DB;
    
$db = DB::instance();
$arr = $db->from('mytable')->where('id', 1)->get()->asArray();
    
$db->where('id',1);
$db->from('mytable');
$rs = $db->get();
echo $rs->count();  // 行数
foreach ($rs as $item)
{
    ...
}

$db->from('mytable')->where('id', 1)->get();
echo $db->lastQuery();     //SELECT * FROM `mytable` where `id` = 1

$db = DB::instance();
$data = [
    'title' => 'test',
    'count' => 1,
];
$where = [
    'id' => 1,
];
$rs = $db->update('test',$data,$where);
echo $rs;                //影响的行数，若返回的是0，则表示没有更新到数据
echo $db->lastQuery();   //UPDATE `test` SET `title` = 'test', `count` = 1 WHERE `id` = 1
    
    
// 同上
$db->where($where)->update('test',$data);
    
// 同上
$db->where($where)->set($data)->table('test')->update();

$db = DB::instance();
$data = [
    'title' => 'test',
    'count' => 1,
];
// 若操作失败返回false，否则返回一个数组
$rs = $db->insert('test',$data);
print_r($rs)    //返回的是一个数组，例如：array(10,1);  其中10表示自增ID号，1表示作用行数

    $db = DB::instance();
    $rs = $db->delete('test' , array('id'=>1) );
    echo $rs;   // 作用行数，0表示没有删除数据，1表示删除1行，2表示删除了2行，以此类推

$db = DB::instance();
    
// 返回 `class_id` = 1 条件下mytable表行数
echo $db->where('class_id' , 1)->countRecords('mytable');      

//SELECT COUNT(1) AS `totalRowCount` FROM `mytable` WHERE `class_id` = 1
echo $db->lastQuery();

 
$db = DB::instance();
$arr = $db->query('SELECT * FROM `'.$db->table_perfix().'mytable` where `id` = 1')->asArray();

// 效果同上
$arr = $db->from('mytable')->where('id', 1)->get()->asArray();

$sql = $db->from('mytable')->where('id', 1)->compile();
echo $sql;      //SELECT * FROM `mytable` where `id` = '1'
    
$sql = $db->value('t',1)->table('mytable')->compile('update');
echo $sql;      //UPDATE `mytable` SET `t` = 1

$db = DB::instance();
$arr = $db->query('SELECT * FROM `mytable` where `id` = 1')->asArray();
print_r($arr);

// 支持直接返回一个stdClass对象
$arr = $db->query('SELECT * FROM `mytable` where `id` = 1',true)->asArray();
var_dump( $arr[0] instanceof strClass );   //bool(true)
    
// 支持直接返回一个用户自定义对象
$arr = $db->query('SELECT * FROM `mytable` where `id` = 1','MyClass')->asArray();
var_dump( $arr[0] instanceof MyClass );   //bool(true)