本文實(shí)例講述了mysql存儲(chǔ)過(guò)程之返回多個(gè)值的方法。分享給大家供大家參考，具體如下：

mysql存儲(chǔ)函數(shù)只返回一個(gè)值。要開(kāi)發(fā)返回多個(gè)值的存儲(chǔ)過(guò)程，需要使用帶有INOUT或OUT參數(shù)的存儲(chǔ)過(guò)程。咱們先來(lái)看一個(gè)orders表它的結(jié)構(gòu)：

mysql> desc orders;

+----------------+-------------+------+-----+---------+-------+

| Field | Type | Null | Key | Default | Extra |

+----------------+-------------+------+-----+---------+-------+

| orderNumber | int(11) | NO | PRI | NULL | |

| orderDate | date | NO | | NULL | |

| requiredDate | date | NO | | NULL | |

| shippedDate | date | YES | | NULL | |

| status | varchar(15) | NO | | NULL | |

| comments | text | YES | | NULL | |

| customerNumber | int(11) | NO | MUL | NULL | |

+----------------+-------------+------+-----+---------+-------+

7 rows in set

然后嘞，咱們來(lái)看一個(gè)存儲(chǔ)過(guò)程，它接受客戶編號(hào)，并返回發(fā)貨(shipped)，取消(canceled)，解決(resolved)和爭(zhēng)議(disputed)的訂單總數(shù)：

DELIMITER $$

CREATE PROCEDURE get_order_by_cust(

IN cust_no INT,

OUT shipped INT,

OUT canceled INT,

OUT resolved INT,

OUT disputed INT)

BEGIN

-- shipped

SELECT

count(*) INTO shipped

FROM

orders

WHERE

customerNumber = cust_no

AND status = 'Shipped';

-- canceled

SELECT

count(*) INTO canceled

FROM

orders

WHERE

customerNumber = cust_no

AND status = 'Canceled';

-- resolved

SELECT

count(*) INTO resolved

FROM

orders

WHERE

customerNumber = cust_no

AND status = 'Resolved';

-- disputed

SELECT

count(*) INTO disputed

FROM

orders

WHERE

customerNumber = cust_no

AND status = 'Disputed';

END

其實(shí)，除IN參數(shù)之外，存儲(chǔ)過(guò)程還需要4個(gè)額外的OUT參數(shù)：shipped, canceled, resolved 和 disputed。 在存儲(chǔ)過(guò)程中，使用帶有count函數(shù)的select語(yǔ)句根據(jù)訂單狀態(tài)獲取相應(yīng)的訂單總數(shù)，并將其分配給相應(yīng)的參數(shù)。按著上面的sql，我們?nèi)绻褂胓et_order_by_cust存儲(chǔ)過(guò)程，可以傳遞客戶編號(hào)和四個(gè)用戶定義的變量來(lái)獲取輸出值。執(zhí)行存儲(chǔ)過(guò)程后，我們?cè)偈褂肧ELECT語(yǔ)句輸出變量值：

+----------+-----------+-----------+-----------+

| @shipped | @canceled | @resolved | @disputed |

+----------+-----------+-----------+-----------+

| 22 | 0 | 1 | 1 |

+----------+-----------+-----------+-----------+

1 row in set

結(jié)合實(shí)際應(yīng)用，我們?cè)賮?lái)看下從PHP程序中調(diào)用返回多個(gè)值的存儲(chǔ)過(guò)程：

/**

* Call stored procedure that return multiple values

* @param $customerNumber

*/

function call_sp($customerNumber)

{

try {

$pdo = new PDO("mysql:host=localhost;dbname=yiibaidb", 'root', '123456');

// execute the stored procedure

$sql = 'CALL get_order_by_cust(:no,@shipped,@canceled,@resolved,@disputed)';

$stmt = $pdo->prepare($sql);

$stmt->bindParam(':no', $customerNumber, PDO::PARAM_INT);

$stmt->execute();

$stmt->closeCursor();

// execute the second query to get values from OUT parameter

$r = $pdo->query("SELECT @shipped,@canceled,@resolved,@disputed")

->fetch(PDO::FETCH_ASSOC);

if ($r) {

printf('Shipped: %d, Canceled: %d, Resolved: %d, Disputed: %d',

$r['@shipped'],

$r['@canceled'],

$r['@resolved'],

$r['@disputed']);

}

} catch (PDOException $pe) {

die("Error occurred:" . $pe->getMessage());

}

}

call_sp(141);

上述代碼中，在@符號(hào)之前的用戶定義的變量與數(shù)據(jù)庫(kù)連接相關(guān)聯(lián)，因此它們可用于在調(diào)用之間進(jìn)行訪問(wèn)。

好啦，本次分享就到這里了。

更多關(guān)于MySQL相關(guān)內(nèi)容感興趣的讀者可查看本站專題：《MySQL存儲(chǔ)過(guò)程技巧大全》、《MySQL常用函數(shù)大匯總》、《MySQL日志操作技巧大全》、《MySQL事務(wù)操作技巧匯總》及《MySQL數(shù)據(jù)庫(kù)鎖相關(guān)技巧匯總》

希望本文所述對(duì)大家MySQL數(shù)據(jù)庫(kù)計(jì)有所幫助。

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