SQLite PHP

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安装

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

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本文标题：SQLite PHP
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