SQLite3 扩展在PHP 5.3.0是默认启用。这也可能它通过使用禁用 --without-sqlite3 在编译的时候。
Windows用户必须启用php_sqlite3.dll为了使用这个扩展。这个DLL包含与Windows分派PHP 如 PHP 5.3.0。
有关详细的安装说明，请查看我们的PHP教程和其官方网站上。
PHP 接口API
以下是重要的PHP程序，就足够完成工作要求从PHP程序使用SQLite数据库。如果要找一个更复杂的应用程序，那么你可以看看到PHP官方文件。
| S.N. | API & 描述 |
|---|---|
| 1 |
public void SQLite3::open ( filename, flags, encryption_key ) 打开一个SQLite3数据库。如果构建包括加密，然后它会试图使用密钥。 If the filename is given as ':memory:', SQLite3::open() will create an in-memory database in RAM that lasts only for the duration of the session. If filename is actual device file name, SQLite3::open() attempts to open the database file by using its value. If no file by that name exists then a new database file by that name gets created. Optional flags used to determine how to open the SQLite database. By default, open uses SQLITE3_OPEN_READWRITE | SQLITE3_OPEN_CREATE. |
| 2 |
public bool SQLite3::exec ( string $query ) This routine provides a quick, easy way to execute SQL commands provided by sql argument which can consist of more than one SQL command. This routine is used to execute a result-less query against a given database. |
| 3 |
public SQLite3Result SQLite3::query ( string $query ) This routine executes an SQL query, returning an SQLite3Result object if the query returns results. |
| 4 |
public int SQLite3::lastErrorCode ( void ) This routine returns the numeric result code of the most recent failed SQLite request |
| 5 |
public string SQLite3::lastErrorMsg ( void ) This routine returns english text describing the most recent failed SQLite request. |
| 6 |
public int SQLite3::changes ( void ) This routine returns the number of database rows that were updated or inserted or deleted by the most recent SQL statement |
| 7 |
public bool SQLite3::close ( void ) This routine closes a database connection previously opened by a call to SQLite3::open(). |
| 8 |
public string SQLite3::escapeString ( string $value ) This routine returns a string that has been properly escaped for safe inclusion in an SQL statement. |
连接到数据库
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，终于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 "; } ?>
现在，让我们运行上面的程序在当前目录中创建我们的数据库test.db。按要求可以改变你的路径。如果数据库创建成功，则它会给下面的消息：
Open database successfully
创建表
下面的PHP程序将使用以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 "; } $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 "; } $db->close(); ?>
上述程序执行时，它会创建表COMPANYtest.db的，它会显示以下消息：
Opened database successfully Table created successfully
INSERT 操作
PHP程序，显示我们如何能够创造我们的COMPANY在上面的例子中创建表中的记录：
<?php class MyDB extends SQLite3 { function __construct() { $this->open('test.db'); } } $db = new MyDB(); if(!$db){ echo $db->lastErrorMsg(); } else { echo "Opened database successfully "; } $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 "; } $db->close(); ?>
上述程序执行时，它会创建COMPANY表中的记录，并显示以下两行：
Opened database successfully Records created successfully
SELECT 操作
PHP程序表明我们如何能够获取并显示COMPANY 表在上面的例子中创建表的记录：
<?php class MyDB extends SQLite3 { function __construct() { $this->open('test.db'); } } $db = new MyDB(); if(!$db){ echo $db->lastErrorMsg(); } else { echo "Opened database successfully "; } $sql =<<<EOF SELECT * from COMPANY; EOF; $ret = $db->query($sql); while($row = $ret->fetchArray(SQLITE3_ASSOC) ){ echo "ID = ". $row['ID'] . " "; echo "NAME = ". $row['NAME'] ." "; echo "ADDRESS = ". $row['ADDRESS'] ." "; echo "SALARY = ".$row['SALARY'] ." "; } echo "Operation done successfully "; $db->close(); ?>
当上述程序执行时，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代码显示了如何我们可以使用UPDATE语句来更新任何记录，然后获取并显示更新的记录，从COMPANY 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 "; } $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 "; } $sql =<<<EOF SELECT * from COMPANY; EOF; $ret = $db->query($sql); while($row = $ret->fetchArray(SQLITE3_ASSOC) ){ echo "ID = ". $row['ID'] . " "; echo "NAME = ". $row['NAME'] ." "; echo "ADDRESS = ". $row['ADDRESS'] ." "; echo "SALARY = ".$row['SALARY'] ." "; } echo "Operation done successfully "; $db->close(); ?>
当上述程序执行时，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，表明我们如何能够使用DELETE语句删除任何记录，然后获取并显示剩余的记录COMPANY 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 "; } $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 "; } $sql =<<<EOF SELECT * from COMPANY; EOF; $ret = $db->query($sql); while($row = $ret->fetchArray(SQLITE3_ASSOC) ){ echo "ID = ". $row['ID'] . " "; echo "NAME = ". $row['NAME'] ." "; echo "ADDRESS = ". $row['ADDRESS'] ." "; echo "SALARY = ".$row['SALARY'] ." "; } echo "Operation done successfully "; $db->close(); ?>
当上述程序执行时，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
