[英]In php the mysqli how to compare two table data in different database
完成 mysqli 連接后如何編碼比較數據。
數據庫名稱 garden_fruit1,密碼 123456,數據庫用戶名 garden_fruit1。
$link1 = mysqli_connect("localhost", "garden_fruit1", "123456", "garden_fruit1");
// Check for connection
if($link1 == true) {
echo "garden_fruit1 Connected Successfully";
}
else {
die("ERROR: Could not connect " . mysqli_connect_error());
}
數據庫名稱 garden_fruit2,密碼 123456,數據庫用戶名 garden_fruit2。
$link2 = mysqli_connect("localhost", "garden_fruit2", "123456", "garden_fruit2");
// Check for connection
if($link2 == true) {
echo "garden_fruit2 Connected Successfully";
}
else {
die("ERROR: Could not connect " . mysqli_connect_error());
}
示例數據庫表。
fruit1 //from garden_fruit1 database
===========================
|id_fruit_1 fruit price
|1 apple 3.00
|2 grape 5.00
fruit2 //from garden_fruit2 database
===========================
|id_fruit_2 fruit price
|1 apple 3.00
|2 grape 5.00
獲取連接到數據庫
$data1 = mysqli_query($link1,"SELECT id_fruit_1 FROM fruit1"); //database garden_fruit1
$data2 = mysqli_query($link2, "SELECT id_fruit_2 FROM fruit2"); //database garden_fruit2
所以,我想問一下如何從差異數據庫中比較數據?
您可以使用添加到表中的數據庫前綴:
SELECT id_fruit_1 FROM garden_fruit1.fruit1
SELECT id_fruit_2 FROM garden_fruit2.fruit2
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