PHP使用Redis的Hash(哈希表)命令

1.Hash(哈希表)命令

2.在Hash的key中设置一个或多个字段值

<?php
/**
 * Created by PhpStorm.
 * User: jmsite.cn
 * Date: 2019/1/25
 * Time: 18:33
 */
try {
    $redis = new Redis();
    $redis->connect('192.168.75.132', 6379);
    //设置多个字段值
    $ret = $redis->hMSet('product_info_123', array(
        'product_id'            => 123,
        'product_name'          => 'Gregory登山包B75蓝色2015款',
        'product_price'         => 1700.00,
        'product_sales_volume'  => 10,
        'product_stocks'        => 20,
    ));
    var_dump($ret);
    //设置一个字段值
    $ret = $redis->hSet('product_info_123', 'product_feature', '一款背负系统极佳的登山包');
    var_dump($ret);
} catch (Exception $e){
    echo $e->getMessage();
}

执行结果

bool(true)
int(1)

3.设置Hash的过期时间，并获取Hash的字段值

try {
    $redis = new Redis();
    $redis->connect('192.168.75.132', 6379);
    //设置过期时间
    $ret = $redis->ttl('product_info_123');
    if ($ret === -1){
        $ret = $redis->expire('product_info_123', 3600);
        var_dump($ret);
    }
    //获取产品名称
    $ret = $redis->hGet('product_info_123', 'product_name');
    var_dump($ret);
    //获取价格和销量
    $ret = $redis->hMGet('product_info_123', array('product_price', 'product_sales_volume'));
    var_dump($ret);
} catch (Exception $e){
    echo $e->getMessage();
}

执行结果

bool(true)
string(32) "Gregory登山包B75蓝色2015款"
array(2) {
    ["product_price"]=>
  string(4) "1700"
    ["product_sales_volume"]=>
  string(2) "10"
}

4.变价，增加销量，减库存,获取全部字段值

try {
    $redis = new Redis();
    $redis->connect('192.168.75.132', 6379);
    //价格加15.99
    $ret = $redis->hIncrByFloat('product_info_123', 'product_price', 15.99);
    var_dump($ret);
    //销量加1
    $ret = $redis->hIncrBy('product_info_123', 'product_sales_volume', 1);
    var_dump($ret);
    //库存减1
    $ret = $redis->hIncrBy('product_info_123', 'product_stocks', -1);
    var_dump($ret);
    //获取全部字段值
    $ret = $redis->hGetAll('product_info_123');
    var_dump($ret);
} catch (Exception $e){
    echo $e->getMessage();
}

执行结果

float(1715.99)
int(11)
int(19)
array(6) {
    ["product_id"]=>
  string(3) "123"
    ["product_name"]=>
  string(32) "Gregory登山包B75蓝色2015款"
    ["product_price"]=>
  string(22) "1715.98999999999999999"
    ["product_sales_volume"]=>
  string(2) "11"
    ["product_stocks"]=>
  string(2) "19"
    ["product_feature"]=>
  string(36) "一款背负系统极佳的登山包"
}

5.字段相关操作

try {
    $redis = new Redis();
    $redis->connect('192.168.75.132', 6379);
    //判断字段product_feature和product_category是否存在
    $ret = $redis->hExists('product_info_123', 'product_feature');
    var_dump($ret);
    $ret = $redis->hExists('product_info_123', 'product_category');
    var_dump($ret);
    //获取字段长度
    $ret = $redis->hLen('product_info_123');
    var_dump($ret);
    //获取全部字段
    $ret = $redis->hKeys('product_info_123');
    var_dump($ret);
} catch (Exception $e){
    echo $e->getMessage();
}

执行结果

bool(true)
bool(false)
int(6)
array(6) {
    [0]=>
  string(10) "product_id"
    [1]=>
  string(12) "product_name"
    [2]=>
  string(13) "product_price"
    [3]=>
  string(20) "product_sales_volume"
    [4]=>
  string(14) "product_stocks"
    [5]=>
  string(15) "product_feature"
}

6.删除字段，获取所有字段值

try {
    $redis = new Redis();
    $redis->connect('192.168.75.132', 6379);
    //删除product_feature和product_stocks
    $ret = $redis->hDel('product_info_123', 'product_feature', 'product_stocks');
    var_dump($ret);
    //获取所有字段值
    $ret = $redis->hVals('product_info_123');
    var_dump($ret);
} catch (Exception $e){
    echo $e->getMessage();
}

执行结果

int(2)
array(4) {
    [0]=>
  string(3) "123"
    [1]=>
  string(32) "Gregory登山包B75蓝色2015款"
    [2]=>
  string(22) "1715.98999999999999999"
    [3]=>
  string(2) "11"
}

注意：商品价格变价后出现1715.98999999999999999是因为php精度问题造成的，需要使用php的round方法截取
原文地址：https://www.jmsite.cn/blog-609.html