序號(hào)	API & 描述
1	public void SQLite3::open ( filename, flags, encryption_key ) 打開一個(gè) SQLite 3 數(shù)據(jù)庫(kù)。如果構(gòu)建包括加密，那么它將嘗試使用的密鑰。如果文件名 filename 賦值為 ':memory:'，那么 SQLite3::open() 將會(huì)在 RAM 中創(chuàng)建一個(gè)內(nèi)存數(shù)據(jù)庫(kù)，這只會(huì)在 session 的有效時(shí)間內(nèi)持續(xù)。如果文件名 filename 為實(shí)際的設(shè)備文件名稱，那么 SQLite3::open() 將使用這個(gè)參數(shù)值嘗試打開數(shù)據(jù)庫(kù)文件。如果該名稱的文件不存在，那么將創(chuàng)建一個(gè)新的命名為該名稱的數(shù)據(jù)庫(kù)文件。可選的 flags 用于判斷是否打開 SQLite 數(shù)據(jù)庫(kù)。默認(rèn)情況下，當(dāng)使用 SQLITE3_OPEN_READWRITE \| SQLITE3_OPEN_CREATE 時(shí)打開。
2	public bool SQLite3::exec ( string $query ) 該例程提供了一個(gè)執(zhí)行 SQL 命令的快捷方式，SQL 命令由 sql 參數(shù)提供，可以由多個(gè) SQL 命令組成。該程序用于對(duì)給定的數(shù)據(jù)庫(kù)執(zhí)行一個(gè)無結(jié)果的查詢。
3	public SQLite3Result SQLite3::query ( string $query ) 該例程執(zhí)行一個(gè) SQL 查詢，如果查詢到返回結(jié)果則返回一個(gè) SQLite3Result 對(duì)象。
4	public int SQLite3::lastErrorCode ( void ) 該例程返回最近一次失敗的 SQLite 請(qǐng)求的數(shù)值結(jié)果代碼。
5	public string SQLite3::lastErrorMsg ( void ) 該例程返回最近一次失敗的 SQLite 請(qǐng)求的英語文本描述。
6	public int SQLite3::changes ( void ) 該例程返回最近一次的 SQL 語句更新或插入或刪除的數(shù)據(jù)庫(kù)行數(shù)。
7	public bool SQLite3::close ( void ) 該例程關(guān)閉之前調(diào)用 SQLite3::open() 打開的數(shù)據(jù)庫(kù)連接。
8	public string SQLite3::escapeString ( string $value ) 該例程返回一個(gè)字符串，在 SQL 語句中，出于安全考慮，該字符串已被正確地轉(zhuǎn)義。

連接數(shù)據(jù)庫(kù)

下面的 PHP 代碼顯示了如何連接到一個(gè)現(xiàn)有的數(shù)據(jù)庫(kù)。如果數(shù)據(jù)庫(kù)不存在，那么它就會(huì)被創(chuàng)建，最后將返回一個(gè)數(shù)據(jù)庫(kù)對(duì)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";
   }
?>

現(xiàn)在，讓我們來運(yùn)行上面的程序，在當(dāng)前目錄中創(chuàng)建我們的數(shù)據(jù)庫(kù) test.db。您可以根據(jù)需要改變路徑。如果數(shù)據(jù)庫(kù)成功創(chuàng)建，那么會(huì)顯示下面所示的消息：

    Open database successfully

創(chuàng)建表

下面的 PHP 代碼段將用于在先前創(chuàng)建的數(shù)據(jù)庫(kù)中創(chuàng)建一個(gè)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();
?>

上述程序執(zhí)行時(shí)，它會(huì)在 test.db 中創(chuàng)建 COMPANY 表，并顯示下面所示的消息：

    Opened database successfully
    Table created successfully

INSERT 操作

下面的 PHP 程序顯示了如何在上面創(chuàng)建的 COMPANY 表中創(chuàng)建記錄：

<?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();
?>

上述程序執(zhí)行時(shí)，它會(huì)在 COMPANY 表中創(chuàng)建給定記錄，并會(huì)顯示以下兩行：

    Opened database successfully
    Records created successfully

SELECT 操作

下面的 PHP 程序顯示了如何從前面創(chuàng)建的 COMPANY 表中獲取并顯示記錄：

<?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();
?>

上述程序執(zhí)行時(shí)，它會(huì)產(chǎn)生以下結(jié)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 代碼顯示了如何使用 UPDATE 語句來更新任何記錄，然后從 COMPANY 表中獲取并顯示更新的記錄：

<?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();
?>

上述程序執(zhí)行時(shí)，它會(huì)產(chǎn)生以下結(jié)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 代碼顯示了如何使用 DELETE 語句刪除任何記錄，然后從 COMPANY 表中獲取并顯示剩余的記錄：

  <?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();
?>

上述程序執(zhí)行時(shí)，它會(huì)產(chǎn)生以下結(jié)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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