SQLite3扩展名在PHP 5.3.0+
以上都会默认启用。可以在编译时使用--without-sqlite3
来禁用它。
Windows用户可通过启用php_sqlite3.dll
才能使用此扩展。 php_sqlite3.dll
默认包含在PHP 5.3.0
之后的PHP发行版中。
有关详细的安装说明,请查看PHP教程及其官方网站。
以下PHP代码显示如何连接到SQLite数据库。 如果数据库不存在,那么它将创建一个新的数据库,最后将返回一个数据库对象。
<?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"; } ?>
现在,运行上面的程序在当前目录中创建指定数据库:phpdb.db
。可以根据需要更改路径。 如果数据库成功创建,则会提供以下消息:
在执行上面语句后,应该也会在相同的目录下自动创建一个名称为:phpdb.db
的数据库文件。如下所示 -
以下PHP程序将用于在上面创建的数据库(phpdb.db
)中创建一个表:
<?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
)中创建一个名称为:company
的表,并显示以下消息:
以下PHP程序显示了如何在上述示例中创建的company
表中插入数据记录:
<?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"; } // 先删除后创建表 $sql = "DROP table company"; $ret = $db->exec($sql); // 创建表语句 $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,并显示如下:
以下PHP程序显示了如何从上述示例中创建的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"; } // 先删除后创建表 $sql = "DROP table company"; $ret = $db->exec($sql); // 创建表 $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,会产生以下结果:
以下PHP代码显示了如何使用UPDATE
语句来更新记录,然后从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"; } // 先删除后创建表 $sql = "DROP table company"; $ret = $db->exec($sql); // 创建表 $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,会产生以下结果:
以下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 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"; } // 先删除后创建表 $sql = "DROP table company"; $ret = $db->exec($sql); // 创建表 $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,会产生以下结果:
由于其它操作都类似,只需写上对应SQL语句,然后使用PHP执行即可,所以其它的示例在这里就不再一一演示了。如有疑问,可以留言联系。