我已经多天尝试使用MySQLi从查询中导出.csv
中的某些值,但是在导出时出现问题,所有内容都导出到单个列,而不是我需要导出应该像SQL代码一样(我有3个选定的列,我需要.cvs
中的3个导出列)。
贝娄你可以找到两个代码:
1)此代码创建数据库,表并插入值:
<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "myDB";
// Create connection
$conn = new mysqli($servername, $username, $password);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
// Create database
$sql = "CREATE DATABASE myDB";
if ($conn->query($sql) === TRUE) {
echo "Database created successfully";
} else {
echo "Error creating database: " . $conn->error;
}
// Create connection pt a crea tabela
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
// sql to create table
$sql = "CREATE TABLE MyGuests (
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
firstname VARCHAR(30) NOT NULL,
lastname VARCHAR(30) NOT NULL,
email VARCHAR(50),
reg_date TIMESTAMP
)";
if ($conn->query($sql) === TRUE) {
echo "Table MyGuests created successfully";
} else {
echo "Error creating table: " . $conn->error;
}
// Create connection pt a insera valori
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
// Insert value in db
$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe, Mark', 'john@example.com'),
('Mary', 'Moe-Johny', 'mary@example.com'),
('Julie', 'Dooley', 'julie@example.com')";
if ($conn->query($sql) === TRUE) {
echo "New record created successfully";
} else {
echo "Error: " . $sql . "<br>" . $conn->error;
}
$conn->close();
?>
2)此代码用于导出.csv
:
<?php
//header to give the order to the browser
header('Content-Type: text/csv');
header('Content-Disposition: attachment;filename=export.csv');
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "myDB";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT id, firstname, lastname FROM MyGuests";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "<br>";
}
} else {
echo "0 results";
}
$conn->close();
?>
我正在使用这个XAMP版本:
Apache / 2.4.18(Win32)OpenSSL / 1.0.2e PHP / 7.0.1
数据库客户端版本:libmysql - mysqlnd 5.0.12-dev - 20150407 - $ Id:7e72f9690b1498a1bead7a637c33a831c0d2f655 $
PHP扩展:mysqli文档
PHP版本:7.0.1
这个版本为MySQL代码带来了一些问题,这就是为什么我更喜欢MySQLi中的代码。 非常感谢你!
答案 0 :(得分:5)
根据新信息,我将此作为解决方案。
<?php
// call export function
exportMysqlToCsv('export_csv.csv');
// export csv
function exportMysqlToCsv($filename = 'export_csv.csv')
{
$conn = dbConnection();
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql_query = "SELECT id, firstname, lastname FROM MyGuests";
// Gets the data from the database
$result = $conn->query($sql_query);
$f = fopen('php://temp', 'wt');
$first = true;
while ($row = $result->fetch_assoc()) {
if ($first) {
fputcsv($f, array_keys($row));
$first = false;
}
fputcsv($f, $row);
} // end while
$conn->close();
$size = ftell($f);
rewind($f);
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Content-Length: $size");
// Output to browser with appropriate mime type, you choose ;)
header("Content-type: text/x-csv");
header("Content-type: text/csv");
header("Content-type: application/csv");
header("Content-Disposition: attachment; filename=$filename");
fpassthru($f);
exit;
}
// db connection function
function dbConnection(){
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "myDB";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
return $conn;
}
?>