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SQLite - PHP安装自 PHP 5.3.0 起默认启用 SQLite3 扩展。可以在编译时使用 --without-sqlite3 禁用 SQLite3 扩展。 Windows 用户必须启用 php_sqlite3.dll 才能使用该扩展。自 PHP 5.3.0 起，这个 DLL 被包含在 PHP 的 Windows 分发版中。 如需了解详细的安装指导，建议查看我们的 PHP 教程和它的官方网站。 PHP 接口 API以下是重要的 PHP 程序，可以满足您在 PHP 程序中使用 SQLite 数据库的需求。如果您需要了解更多细节，请查看 PHP 官方文档。
连接数据库下面的 PHP 代码显示了如何连接到一个现有的数据库。如果数据库不存在，那么它就会被创建，最后将返回一个数据库对象。
<?php class MyDB extends SQLite3 { function __construct() { $this->open('test.db');
}
}
$db = new MyDB();
if(!$db){
echo $db->lastErrorMsg();
} else {
echo "Opened database successfully\n";
}
?>
现在，让我们来运行上面的程序，在当前目录中创建我们的数据库 test.db。您可以根据需要改变路径。如果数据库成功创建，那么会显示下面所示的消息： Open database successfully 创建表下面的 PHP 代码段将用于在先前创建的数据库中创建一个表：
<?php class MyDB extends SQLite3 { function __construct() { $this->open('test.db');
}
}
$db = new MyDB();
if(!$db){
echo $db->lastErrorMsg();
} else {
echo "Opened database successfully\n";
}
$sql =<<<EOF CREATE TABLE COMPANY (ID INT PRIMARY KEY NOT NULL, NAME TEXT NOT NULL, AGE INT NOT NULL, ADDRESS CHAR(50), SALARY REAL); EOF; $ret = $db->exec($sql);
if(!$ret){
echo $db->lastErrorMsg();
} else {
echo "Table created successfully\n";
}
$db->close();
?>
上述程序执行时，它会在 test.db 中创建 COMPANY 表，并显示下面所示的消息： Opened database successfully Table created successfully INSERT 操作下面的 PHP 程序显示了如何在上面创建的 COMPANY 表中创建记录：
<?php class MyDB extends SQLite3 { function __construct() { $this->open('test.db');
}
}
$db = new MyDB();
if(!$db){
echo $db->lastErrorMsg();
} else {
echo "Opened database successfully\n";
}
$sql =<<<EOF INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) VALUES (1, 'Paul', 32, 'California', 20000.00 ); INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) VALUES (2, 'Allen', 25, 'Texas', 15000.00 ); INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) VALUES (3, 'Teddy', 23, 'Norway', 20000.00 ); INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) VALUES (4, 'Mark', 25, 'Rich-Mond ', 65000.00 ); EOF; $ret = $db->exec($sql);
if(!$ret){
echo $db->lastErrorMsg();
} else {
echo "Records created successfully\n";
}
$db->close();
?>
上述程序执行时，它会在 COMPANY 表中创建给定记录，并会显示以下两行： Opened database successfully Records created successfully SELECT 操作下面的 PHP 程序显示了如何从前面创建的 COMPANY 表中获取并显示记录：
<?php class MyDB extends SQLite3 { function __construct() { $this->open('test.db');
}
}
$db = new MyDB();
if(!$db){
echo $db->lastErrorMsg();
} else {
echo "Opened database successfully\n";
}
$sql =<<<EOF SELECT * from COMPANY; EOF; $ret = $db->query($sql);
while($row = $ret->fetchArray(SQLITE3_ASSOC) ){
echo "ID = ". $row['ID'] . "\n";
echo "NAME = ". $row['NAME'] ."\n";
echo "ADDRESS = ". $row['ADDRESS'] ."\n";
echo "SALARY = ".$row['SALARY'] ."\n\n";
}
echo "Operation done successfully\n";
$db->close();
?>
上述程序执行时，它会产生以下结果： Opened database successfully ID = 1 NAME = Paul ADDRESS = California SALARY = 20000 ID = 2 NAME = Allen ADDRESS = Texas SALARY = 15000 ID = 3 NAME = Teddy ADDRESS = Norway SALARY = 20000 ID = 4 NAME = Mark ADDRESS = Rich-Mond SALARY = 65000 Operation done successfully UPDATE 操作下面的 PHP 代码显示了如何使用 UPDATE 语句来更新任何记录，然后从 COMPANY 表中获取并显示更新的记录：
<?php class MyDB extends SQLite3 { function __construct() { $this->open('test.db');
}
}
$db = new MyDB();
if(!$db){
echo $db->lastErrorMsg();
} else {
echo "Opened database successfully\n";
}
$sql =<<<EOF UPDATE COMPANY set SALARY = 25000.00 where ID=1; EOF; $ret = $db->exec($sql);
if(!$ret){
echo $db->lastErrorMsg();
} else {
echo $db->changes(), " Record updated successfully\n";
}
$sql =<<<EOF SELECT * from COMPANY; EOF; $ret = $db->query($sql);
while($row = $ret->fetchArray(SQLITE3_ASSOC) ){
echo "ID = ". $row['ID'] . "\n";
echo "NAME = ". $row['NAME'] ."\n";
echo "ADDRESS = ". $row['ADDRESS'] ."\n";
echo "SALARY = ".$row['SALARY'] ."\n\n";
}
echo "Operation done successfully\n";
$db->close();
?>
上述程序执行时，它会产生以下结果： Opened database successfully 1 Record updated successfully ID = 1 NAME = Paul ADDRESS = California SALARY = 25000 ID = 2 NAME = Allen ADDRESS = Texas SALARY = 15000 ID = 3 NAME = Teddy ADDRESS = Norway SALARY = 20000 ID = 4 NAME = Mark ADDRESS = Rich-Mond SALARY = 65000 Operation done successfully DELETE 操作下面的 PHP 代码显示了如何使用 DELETE 语句删除任何记录，然后从 COMPANY 表中获取并显示剩余的记录：
<?php class MyDB extends SQLite3 { function __construct() { $this->open('test.db');
}
}
$db = new MyDB();
if(!$db){
echo $db->lastErrorMsg();
} else {
echo "Opened database successfully\n";
}
$sql =<<<EOF DELETE from COMPANY where ID=2; EOF; $ret = $db->exec($sql);
if(!$ret){
echo $db->lastErrorMsg();
} else {
echo $db->changes(), " Record deleted successfully\n";
}
$sql =<<<EOF SELECT * from COMPANY; EOF; $ret = $db->query($sql);
while($row = $ret->fetchArray(SQLITE3_ASSOC) ){
echo "ID = ". $row['ID'] . "\n";
echo "NAME = ". $row['NAME'] ."\n";
echo "ADDRESS = ". $row['ADDRESS'] ."\n";
echo "SALARY = ".$row['SALARY'] ."\n\n";
}
echo "Operation done successfully\n";
$db->close();
?>
上述程序执行时，它会产生以下结果： Opened database successfully 1 Record deleted successfully ID = 1 NAME = Paul ADDRESS = California SALARY = 25000 ID = 3 NAME = Teddy ADDRESS = Norway SALARY = 20000 ID = 4 NAME = Mark ADDRESS = Rich-Mond SALARY = 65000 Operation done successfully  |
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