thinkphp中if使用以及concat的使用实例

thinkphp中联合if和concat的使用方法

"IF (pp.reason_name != '',concat( pp.reason_name, if(pp.remark != '',',',''), pp.remark  ),'' ) " => 'remark'

 if使用方法  IF(expr1,expr2,expr3)
如果 expr1 是TRUE (expr1 <> 0 and expr1 <> NULL)，则 IF()的返回值为expr2; 否则返回值则为 expr3。IF()的返回值为数字值或字符串值，具体情况视其所在语境而定。

"IF (pp.reason_name != ''，'显示表达式' ，'')" => '使用别名'

concat使用方法

CONCAT（）函数用于将多个字符串连接成一个字符串
例子

mysql> SELECT CONCAT(’My’, ‘S’, ‘QL’);

-> ‘MySQL’

concat( pp.reason_name, if(pp.remark != '',',',''), pp.remark  )

查询sql语句

Db::name('spu_info')->alias('pi')
            ->leftJoin('spu p', 'p.spu = pi.spu')
            ->leftJoin('sku k', 'k.spu = pi.spu')
            ->leftJoin('supplier s', 's.id = k.supplier_id')
            ->leftJoin('product_process pp', 'pp.id = p.process_id and pp.spu = p.spu')
            ->LeftJoin('spu_sub ss', 'ss.spu = pi.spu')
            ->field([ "IF (pp.reason_name != '',concat( pp.reason_name, if(pp.remark != '',',',''), pp.remark  ),'' ) " => 'remark', 'pi.count', 'pi.is_copy'])->group('pi.spu')
            ->paginate(
                $pagesize, false,
                ['query' => Request::param()]
            )->toArray();

连接if 与concat使用实例

case is_stop when '1' then '停用' else '在用' end is_stop

 Db::name("dictionary")
            ->field("id,name,name_en,is_stop status,case is_stop when '1' then '停用' else '在用' end is_stop,create_at,memo,num")
            ->where("pid", 0)
            // ->buildSql();
            ->select()
            ->toArray();

case 与 when 联合使用

判断年龄天数

# when 表达式中可以使用 and 连接条件
SELECT
    NAME '英雄',
    age '年龄',
    CASE
        WHEN age < 18 THEN
            '少年'
        WHEN age < 30 THEN
            '青年'
        WHEN age >= 30
        AND age < 50 THEN
            '中年'
        ELSE
            '老年'
    END '状态'
FROM
    user_info;

 if 查询sql 

SELECT DISTINCT
    `pa`.`email` AS `paypal邮箱`,
    `ptl`.`transaction_updated_date` AS `时间日期`,
    `ptl`.`transaction_id` AS `交易号`,
    `ptl`.`paypal_reference_id` AS `参考交易号`,
    `ptl`.`transaction_event_code` AS `类型`,
    `ptl`.`transaction_status` AS `状态`,
    `ptl`.`currency_code` AS `币种`,
    ( ptl.transaction_amount + ptl.fee_amount ) AS `总额`,
    `ptl`.`transaction_amount` AS `费用`,
    `ptl`.`fee_amount` AS `净值`,
    `pa`.`email` AS `收件人邮箱`,
    `ptl`.`transaction_subject` AS `物品名称`,
    `ptl`.`available_balance` AS `余额`,
IF
    ( ptl.transaction_amount > 0 , '贷记', '借记') AS `引起余额变动` 
FROM
    `paypal_transaction_list` AS `ptl`
    LEFT JOIN `paypal_transaction_detail` AS `ptd` ON `ptl`.`transaction_id` = `ptd`.`transaction_id`
    LEFT JOIN `paypal_account` AS `pa` ON `pa`.`paypal_account` = `ptl`.`account_number` 
WHERE
    `pa`.`id` IN ( 109 ) 
    AND `ptl`.`transaction_updated_date` BETWEEN '2021-01-01 00:00:00' 
    AND '2021-02-01 00:00:00' 
ORDER BY
    `ptl`.`id` ASC,
    `ptl`.`transaction_updated_date` ASC

 case  when使用实例

SELECT DISTINCT
    `pa`.`email` AS `paypal邮箱`,
    `ptl`.`transaction_updated_date` AS `时间日期`,
    `ptl`.`transaction_id` AS `交易号`,
    `ptl`.`paypal_reference_id` AS `参考交易号`,
    `ptl`.`transaction_event_code` AS `类型`,
    case `ptl`.`transaction_status` when 'D' then '拒绝交易' 
        when 'F' then '部分退款'
            when 'P' then '待付款'
            when 'S' then '交易完成'
            when 'V' then '退全款'
            else       '未知状态' end AS `状态`,
    `ptl`.`currency_code` AS `币种`,
    ( ptl.transaction_amount + ptl.fee_amount ) AS `总额`,
    `ptl`.`transaction_amount` AS `费用`,
    `ptl`.`fee_amount` AS `净值`,
    `pa`.`email` AS `收件人邮箱`,
    `ptl`.`transaction_subject` AS `物品名称`,
    `ptl`.`available_balance` AS `余额`,
IF
    ( ptl.transaction_amount > 0 , '贷记', '借记') AS `引起余额变动` 
FROM
    `paypal_transaction_list` AS `ptl`
    LEFT JOIN `paypal_transaction_detail` AS `ptd` ON `ptl`.`transaction_id` = `ptd`.`transaction_id`
    LEFT JOIN `paypal_account` AS `pa` ON `pa`.`paypal_account` = `ptl`.`account_number` 
WHERE
-- --     `pa`.`id` IN ( 109 ) 
--     AND 
    `ptl`.`transaction_updated_date` BETWEEN '2021-01-01 00:00:00' 
    AND '2021-02-01 00:00:00' 
ORDER BY
    `ptl`.`id` ASC,
    `ptl`.`transaction_updated_date` ASC