php如何讀取數(shù)據(jù)庫轉(zhuǎn)json數(shù)據(jù)[vc keyong]

更新時間：2023-02-14 編輯：創(chuàng)始人關(guān)注人次：0 新格搜索

php讀取數(shù)據(jù)庫轉(zhuǎn)json數(shù)據(jù)的實現(xiàn)方法：首先連接數(shù)據(jù)庫并讀取數(shù)據(jù)庫；然后在數(shù)據(jù)庫讀取后，直接將數(shù)據(jù)轉(zhuǎn)換為數(shù)組顯示；最后通過“json_encode”轉(zhuǎn)為JSON即可。推薦：《PHP視頻教程》PHP讀取數(shù)據(jù)庫記錄轉(zhuǎn)換為JSON的代碼(API接口的SQL語句)為了提供API接口，我們常常在讀取數(shù)據(jù)庫后，將數(shù)據(jù)轉(zhuǎn)換為數(shù)組，通過json_encode轉(zhuǎn)為JSON，即可滿足使用需要?，F(xiàn)將代碼粘帖如下：讀取

php讀取數(shù)據(jù)庫轉(zhuǎn)json數(shù)據(jù)的實現(xiàn)方法：首先連接數(shù)據(jù)庫并讀取數(shù)據(jù)庫；然后在數(shù)據(jù)庫讀取后，直接將數(shù)據(jù)轉(zhuǎn)換為數(shù)組顯示；最后通過“json_encode”轉(zhuǎn)為JSON即可。

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PHP讀取數(shù)據(jù)庫記錄轉(zhuǎn)換為JSON的代碼(API接口的SQL語句)

為了提供API接口，我們常常在讀取數(shù)據(jù)庫后，將數(shù)據(jù)轉(zhuǎn)換為數(shù)組，通過json_encode轉(zhuǎn)為JSON，即可滿足使用需要?，F(xiàn)將代碼粘帖如下：

讀取一條記錄，轉(zhuǎn)為數(shù)組并輸出JSON

include("../../db/conn.php");//數(shù)據(jù)庫連接；

echo "<pre>";

//數(shù)據(jù)庫讀取后，直接轉(zhuǎn)換為數(shù)組顯示;

$sql = "select salesid,fromstore,fromsaler,salestime,salenum,totalprice from midea_sales WHERE salesid=44";

$results = mysqli_query($con, $sql);

$rows = mysqli_fetch_assoc($results);

foreach ($rows as $key => $v) {

$res[$key] = $v;

}

echo json_encode($res);

讀取N條記錄，轉(zhuǎn)為多維數(shù)組并輸出JSON（第一種寫法）

//數(shù)據(jù)庫讀取后，直接轉(zhuǎn)換為數(shù)組顯示;

$sql = "select salesid,fromstore,fromsaler,salestime,salenum,totalprice from midea_sales";

$results = mysqli_query($con, $sql);

$data = array();//初始化數(shù)組;

class Alteration

{

public $fromstore;

public $fromsaler;

public $salenum;

public $totalprice;

}

while ($row = mysqli_fetch_assoc($results)) {

$alter = new Alteration();//實例化對象;

$alter->fromstore = $row['fromstore'];

$alter->fromsaler = $row['fromsaler'];

$alter->salenum = $row['salenum'];

$alter->totalprice = $row['totalprice'];

$data[] = $alter;

}

echo json_encode($data);

讀取N條記錄，轉(zhuǎn)為多維數(shù)組并輸出JSON（第二種寫法）

$sql = "select salesid,fromstore,fromsaler,salestime,salenum,totalprice from midea_sales";

$results = mysqli_query($con, $sql);

while ($rows = mysqli_fetch_assoc($results)) {

$res[] = $rows;

}

//$res = str_replace('[', '{', json_encode($res));

//$res = str_replace(']', '}', $res);

print_r($res);

4.讀取N條記錄，轉(zhuǎn)為多維數(shù)組并輸出JSON（第三種寫法），適合獲取全部記錄

$sql = "select salesid,fromstore,fromsaler,salestime,salenum,totalprice from midea_sales";

$results = mysqli_query($con, $sql);

$rows = mysqli_fetch_all($results);

print_r($rows);

在轉(zhuǎn)換的過程中，JSON格式會出現(xiàn)[]和｛｝兩種格式的JSON，而實際應(yīng)用中對{}的接口是標(biāo)準(zhǔn)接口。如何轉(zhuǎn)換呢？

原因在于：當(dāng)array是一個從0開始的連續(xù)數(shù)組時，json_encode出來的結(jié)果是一個由[]括起來的字符串；而當(dāng)array是不從0開始或者不連續(xù)的數(shù)組時，json_encode出來的結(jié)果是一個由{}括起來的key-value模式的字符串。

$sql = "select salesid,fromstore,fromsaler,salestime,salenum,totalprice from midea_sales";

$results = mysqli_query($con, $sql);

$rows = mysqli_fetch_all($results);

$rows = str_replace('[', '{', json_encode($rows));

$rows = str_replace(']', '}', $rows);

echo json_encode($rows);

以上就是php如何讀取數(shù)據(jù)庫轉(zhuǎn)json數(shù)據(jù)的詳細(xì)內(nèi)容，

https://www.php.cn/php-ask-457793.html