PHP链接SQLite数据库

时间  2019-12-07
标签 php 链接 sqlite 数据库 栏目 PHP 繁體版
原文   原文链接

SQLite3扩展名在PHP 5.3.0+以上都会默认启用。能够在编译时使用--without-sqlite3来禁用它。php

Windows用户可经过启用php_sqlite3.dll才能使用此扩展。 php_sqlite3.dll默认包含在PHP 5.3.0以后的PHP发行版中。sql

有关详细的安装说明，请查看PHP教程及其官方网站。数据库

链接到SQLite数据库

如下PHP代码显示如何链接到SQLite数据库。 若是数据库不存在，那么它将建立一个新的数据库，最后将返回一个数据库对象。yii

<?php
   class SQLiteDB extends SQLite3
   {
      function __construct()
      {
         $this->open('phpdb.db');
      }
   }
   $db = new SQLiteDB();
   if(!$db){
      echo $db->lastErrorMsg();
   } else {
      echo "Yes, Opened database successfully\n";
   }
?>

如今，运行上面的程序在当前目录中建立指定数据库：phpdb.db。能够根据须要更改路径。 若是数据库成功建立，则会提供如下消息：fetch

在执行上面语句后，应该也会在相同的目录下自动建立一个名称为：phpdb.db的数据库文件。以下所示 -网站

建立表

如下PHP程序将用于在上面建立的数据库(phpdb.db)中建立一个表：this

<?php
class SQLiteDB extends SQLite3
{
  function __construct()
  {
	 $this->open('phpdb.db');
  }
}
$db = new SQLiteDB();
if(!$db){
  echo $db->lastErrorMsg();
} else {
  echo "Yes, Opened database successfully<br/>\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 "Yes, Table created successfully<br/>\n";
}
$db->close();

当执行上述程序时，它将在数据库(phpdb.db)中建立一个名称为：company的表，并显示如下消息：code

插入数据操做

如下PHP程序显示了如何在上述示例中建立的company表中插入数据记录：sqlite

<?php
class SQLiteDB extends SQLite3
{
  function __construct()
  {
	 $this->open('phpdb.db');
  }
}
$db = new SQLiteDB();
if(!$db){
  echo $db->lastErrorMsg();
} else {
  echo "Yes, Opened database successfully<br/>\n";
}

// 先删除后建立表
$sql = "DROP table company";
$ret = $db->exec($sql);

// 建立表语句

$sql =<<<EOF
      CREATE TABLE if not exists 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 "Yes, Table created successfully<br/>\n";
}

// $db->close();

$sql =<<<EOF
      INSERT INTO company (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (1, 'Maxsu', 26, 'Haikou', 20000.00 );

      INSERT INTO company (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (2, 'Allen', 25, 'Guangzhou', 15000.00 );

      INSERT INTO company (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (3, 'Tenny', 23, 'Shanghai', 20000.00 );

      INSERT INTO company (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (4, 'Weiwang', 25, 'Beijing ', 65000.00 );
EOF;

   $ret = $db->exec($sql);
   if(!$ret){
      echo $db->lastErrorMsg();
   } else {
      echo "Yes, Some Records has Inserted successfully<br/>\n";
   }
   $db->close();

当执行上述程序时，将向company表中插入给定的记录，并显示以下：对象

SELECT操做

如下PHP程序显示了如何从上述示例中建立的company表中获取并显示数据记录：

<?php
class SQLiteDB extends SQLite3
{
  function __construct()
  {
	 $this->open('phpdb.db');
  }
}
$db = new SQLiteDB();
if(!$db){
  echo $db->lastErrorMsg();
} else {
  echo "Yes, Opened database successfully<br/>\n";
}

// 先删除后建立表
$sql = "DROP table company";
$ret = $db->exec($sql);

// 建立表

$sql =<<<EOF
      CREATE TABLE if not exists 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 "Yes, Table created successfully<br/>\n";
}

// $db->close();

$sql =<<<EOF
      INSERT INTO company (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (1, 'Maxsu', 26, 'Haikou', 20000.00 );

      INSERT INTO company (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (2, 'Allen', 25, 'Guangzhou', 15000.00 );

      INSERT INTO company (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (3, 'Tenny', 23, 'Shanghai', 20000.00 );

      INSERT INTO company (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (4, 'Weiwang', 25, 'Beijing ', 65000.00 );
EOF;

$ret = $db->exec($sql);
if(!$ret){
  echo $db->lastErrorMsg();
} else {
  echo "Yes, Some Records has Inserted successfully<br/>\n";
}

// 查询表中的数据

echo "<b> Select Data from company table :</b><hr/>";

$sql =<<<EOF
  SELECT * from COMPANY;
EOF;

$ret = $db->query($sql);
while($row = $ret->fetchArray(SQLITE3_ASSOC) ){
  echo "ID = ". $row['ID'] . "<br/>\n";
  echo "NAME = ". $row['NAME'] ."<br/>\n";
  echo "ADDRESS = ". $row['ADDRESS'] ."<br/>\n";
  echo "SALARY =  ".$row['SALARY'] ."<br/>\n\n";
  echo '----------------------------------<br/>';
}

echo "Operation done successfully\n";

$db->close();

执行上述程序时，会产生如下结果：

更新操做

如下PHP代码显示了如何使用UPDATE语句来更新记录，而后从company表中获取并显示更新的记录：

<?php
class SQLiteDB extends SQLite3
{
  function __construct()
  {
	 $this->open('phpdb.db');
  }
}
$db = new SQLiteDB();
if(!$db){
  echo $db->lastErrorMsg();
} else {
  echo "Yes, Opened database successfully<br/>\n";
}

// 先删除后建立表
$sql = "DROP table company";
$ret = $db->exec($sql);

// 建立表

$sql =<<<EOF
      CREATE TABLE if not exists 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 "Yes, Table created successfully<br/>\n";
}

// $db->close();

$sql =<<<EOF
      INSERT INTO company (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (1, 'Maxsu', 26, 'Haikou', 20000.00 );

      INSERT INTO company (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (2, 'Allen', 25, 'Guangzhou', 15000.00 );

      INSERT INTO company (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (3, 'Tenny', 23, 'Shanghai', 20000.00 );

      INSERT INTO company (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (4, 'Weiwang', 25, 'Beijing ', 65000.00 );
EOF;

$ret = $db->exec($sql);
if(!$ret){
  echo $db->lastErrorMsg();
} else {
  echo "Yes, Some Records has Inserted successfully<br/>\n";
}

// 更新ID=1的薪水为：29999

$sql = 'UPDATE COMPANY set SALARY = 29999.00 where ID=1';
$ret = $db->exec($sql);
if(!$ret){
  echo $db->lastErrorMsg();
} else {
  echo $db->changes(), " Record(ID=1) updated successfully<br/>\n";
}


// 查询表中的数据

echo "<b> Select Data from company table :</b><hr/>";

$sql =<<<EOF
  SELECT * from COMPANY;
EOF;

$ret = $db->query($sql);
while($row = $ret->fetchArray(SQLITE3_ASSOC) ){
  echo "ID = ". $row['ID'] . "<br/>\n";
  echo "NAME = ". $row['NAME'] ."<br/>\n";
  echo "ADDRESS = ". $row['ADDRESS'] ."<br/>\n";
  echo "SALARY =  ".$row['SALARY'] ."<br/>\n\n";
  echo '----------------------------------<br/>';
}

echo "Operation done successfully\n";

$db->close();

执行上述程序时，会产生如下结果：

删除操做

如下PHP代码显示了如何使用DELETE语句删除任何记录，而后从company表中获取并显示剩余的记录：

<?php
class SQLiteDB extends SQLite3
{
  function __construct()
  {
	 $this->open('phpdb.db');
  }
}
$db = new SQLiteDB();
if(!$db){
  echo $db->lastErrorMsg();
} else {
  echo "Yes, Opened database successfully<br/>\n";
}

// 先删除后建立表
$sql = "DROP table company";
$ret = $db->exec($sql);

// 建立表

$sql =<<<EOF
      CREATE TABLE if not exists 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 "Yes, Table created successfully<br/>\n";
}

// $db->close();

$sql =<<<EOF
      INSERT INTO company (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (1, 'Maxsu', 26, 'Haikou', 20000.00 );

      INSERT INTO company (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (2, 'Allen', 25, 'Guangzhou', 15000.00 );

      INSERT INTO company (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (3, 'Tenny', 23, 'Shanghai', 20000.00 );

      INSERT INTO company (ID,NAME,AGE,ADDRESS,SALARY)
      VALUES (4, 'Weiwang', 25, 'Beijing ', 65000.00 );
EOF;

$ret = $db->exec($sql);
if(!$ret){
  echo $db->lastErrorMsg();
} else {
  echo "Yes, Some Records has Inserted successfully<br/>\n";
}

// 更新ID小于等于2的数据记录

$sql =<<<EOF
  DELETE from COMPANY where ID<=2;
EOF;
$ret = $db->exec($sql);
if(!$ret){
 echo $db->lastErrorMsg();
} else {
  echo $db->changes(), " Record(ID<=2) deleted successfully<br/>\n";
}

// 查询表中的数据

echo "<b> Select Data from company table :</b><hr/>";

$sql =<<<EOF
  SELECT * from COMPANY;
EOF;

$ret = $db->query($sql);
while($row = $ret->fetchArray(SQLITE3_ASSOC) ){
  echo "ID = ". $row['ID'] . "<br/>\n";
  echo "NAME = ". $row['NAME'] ."<br/>\n";
  echo "ADDRESS = ". $row['ADDRESS'] ."<br/>\n";
  echo "SALARY =  ".$row['SALARY'] ."<br/>\n\n";
  echo '----------------------------------<br/>';
}

echo "Operation done successfully\n";

$db->close();

执行上述程序时，会产生如下结果：

因为其它操做都相似，只需写上对应SQL语句，而后使用PHP执行便可，因此其它的示例在这里就再也不一一演示了。若有疑问，能够留言联系。

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