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在PHP中操作MySQL臨時(shí)表,可以有效地存儲(chǔ)和操作中間結(jié)果
CREATE TEMPORARY TABLE
語(yǔ)句創(chuàng)建臨時(shí)表。臨時(shí)表在數(shù)據(jù)庫(kù)會(huì)話結(jié)束時(shí)自動(dòng)刪除。例如,創(chuàng)建一個(gè)名為temp_table
的臨時(shí)表:$conn = new mysqli($servername, $username, $password, $dbname);
// 檢查連接
if ($conn->connect_error) {
die("連接失敗: " . $conn->connect_error);
}
$sql = "CREATE TEMPORARY TABLE temp_table (
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
name VARCHAR(30),
age INT(3)
)";
if ($conn->query($sql) === TRUE) {
echo "臨時(shí)表 temp_table 創(chuàng)建成功";
} else {
echo "創(chuàng)建臨時(shí)表錯(cuò)誤: " . $conn->error;
}
$conn->close();
INSERT INTO
語(yǔ)句將數(shù)據(jù)插入到臨時(shí)表中。例如,向temp_table
插入數(shù)據(jù):$conn = new mysqli($servername, $username, $password, $dbname);
// 檢查連接
if ($conn->connect_error) {
die("連接失敗: " . $conn->connect_error);
}
$sql = "INSERT INTO temp_table (name, age)
VALUES ('John', 25),
('Jane', 30),
('Mike', 35)";
if ($conn->query($sql) === TRUE) {
echo "數(shù)據(jù)插入成功";
} else {
echo "Error: " . $sql . "<br>" . $conn->error;
}
$conn->close();
SELECT
語(yǔ)句查詢臨時(shí)表中的數(shù)據(jù)。例如,從temp_table
查詢數(shù)據(jù):$conn = new mysqli($servername, $username, $password, $dbname);
// 檢查連接
if ($conn->connect_error) {
die("連接失敗: " . $conn->connect_error);
}
$sql = "SELECT * FROM temp_table";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// 輸出數(shù)據(jù)
while($row = $result->fetch_assoc()) {
echo "id: " . $row["id"]. " - Name: " . $row["name"]. " - Age: " . $row["age"]. "<br>";
}
} else {
echo "0 結(jié)果";
}
$conn->close();
UPDATE
語(yǔ)句更新臨時(shí)表中的數(shù)據(jù)。例如,更新temp_table
中的年齡:$conn = new mysqli($servername, $username, $password, $dbname);
// 檢查連接
if ($conn->connect_error) {
die("連接失敗: " . $conn->connect_error);
}
$sql = "UPDATE temp_table
SET age = age + 1
WHERE name = 'John'";
if ($conn->query($sql) === TRUE) {
echo "年齡更新成功";
} else {
echo "Error: " . $sql . "<br>" . $conn->error;
}
$conn->close();
DELETE
語(yǔ)句刪除臨時(shí)表中的數(shù)據(jù)。例如,從temp_table
刪除數(shù)據(jù):$conn = new mysqli($servername, $username, $password, $dbname);
// 檢查連接
if ($conn->connect_error) {
die("連接失敗: " . $conn->connect_error);
}
$sql = "DELETE FROM temp_table WHERE name = 'John'";
if ($conn->query($sql) === TRUE) {
echo "數(shù)據(jù)刪除成功";
} else {
echo "Error: " . $sql . "<br>" . $conn->error;
}
$conn->close();
DROP TEMPORARY TABLE
語(yǔ)句刪除臨時(shí)表。例如,刪除temp_table
:$conn = new mysqli($servername, $username, $password, $dbname);
// 檢查連接
if ($conn->connect_error) {
die("連接失敗: " . $conn->connect_error);
}
$sql = "DROP TEMPORARY TABLE temp_table";
if ($conn->query($sql) === TRUE) {
echo "臨時(shí)表 temp_table 刪除成功";
} else {
echo "刪除臨時(shí)表錯(cuò)誤: " . $conn->error;
}
$conn->close();
總之,在PHP中操作MySQL臨時(shí)表時(shí),需要注意創(chuàng)建、插入、查詢、更新、刪除等操作,并確保在使用完臨時(shí)表后將其刪除以避免不必要的資源浪費(fèi)。
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