PHP连接SQLite数据库
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。
连接到SQLite数据库
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。
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 -
创建表
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:
open('phpdb.db'); } } $db = new SQLiteDB(); if(!$db){ echo $db->lastErrorMsg(); } else { echo "Yes, Opened database successfully
\n"; }
$sql =<<<eof create="" table="" company="" (id="" int="" primary="" key="" not="" null,="" name="" text="" age="" address="" char(50),="" salary="" real);="" eof;="" $ret="$db-">exec($sql);
if(!$ret){
echo $db->lastErrorMsg();
} else {
echo "Yes, Table created successfully
\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:
插入数据操作
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
\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="" null,="" name="" text="" age="" address="" char(50),="" salary="" real);="" eof;="" $ret="$db-">exec($sql);
if(!$ret){
echo $db->lastErrorMsg();
} else {
echo "Yes, Table created successfully
\n";
}// $db->close();
$sql =<<<eof insert="" into="" company="" (id,name,age,address,salary)="" values="" (1,="" 'maxsu',="" 26,="" 'haikou',="" 20000.00="" );="" (2,="" 'allen',="" 25,="" 'guangzhou',="" 15000.00="" (3,="" 'tenny',="" 23,="" 'shanghai',="" (4,="" 'weiwang',="" 'beijing="" ',="" 65000.00="" eof;="" $ret="$db-">exec($sql);
if(!$ret){
echo $db->lastErrorMsg();
} else {
echo "Yes, Some Records has Inserted successfully
\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:
SELECT操作
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
\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="" null,="" name="" text="" age="" address="" char(50),="" salary="" real);="" eof;="" $ret="$db-">exec($sql);
if(!$ret){
echo $db->lastErrorMsg();
} else {
echo "Yes, Table created successfully
\n";
}// $db->close();
$sql =<<<eof insert="" into="" company="" (id,name,age,address,salary)="" values="" (1,="" 'maxsu',="" 26,="" 'haikou',="" 20000.00="" );="" (2,="" 'allen',="" 25,="" 'guangzhou',="" 15000.00="" (3,="" 'tenny',="" 23,="" 'shanghai',="" (4,="" 'weiwang',="" 'beijing="" ',="" 65000.00="" eof;="" $ret="$db-">exec($sql);
if(!$ret){
echo $db->lastErrorMsg();
} else {
echo "Yes, Some Records has Inserted successfully
\n";
}// 查询表中的数据
echo " Select Data from company table :
";$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 '----------------------------------
';
}echo "Operation done successfully\n";
$db->close();
执行上述程序时,会产生以下结果:
更新操作
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
\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="" null,="" name="" text="" age="" address="" char(50),="" salary="" real);="" eof;="" $ret="$db-">exec($sql);
if(!$ret){
echo $db->lastErrorMsg();
} else {
echo "Yes, Table created successfully
\n";
}// $db->close();
$sql =<<<eof insert="" into="" company="" (id,name,age,address,salary)="" values="" (1,="" 'maxsu',="" 26,="" 'haikou',="" 20000.00="" );="" (2,="" 'allen',="" 25,="" 'guangzhou',="" 15000.00="" (3,="" 'tenny',="" 23,="" 'shanghai',="" (4,="" 'weiwang',="" 'beijing="" ',="" 65000.00="" eof;="" $ret="$db-">exec($sql);
if(!$ret){
echo $db->lastErrorMsg();
} else {
echo "Yes, Some Records has Inserted successfully
\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 $db->changes(), " Record(ID=1) updated successfully
\n";
}// 查询表中的数据
echo " Select Data from company table :
";$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 '----------------------------------
';
}echo "Operation done successfully\n";
$db->close();
执行上述程序时,会产生以下结果:
删除操作
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
\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="" null,="" name="" text="" age="" address="" char(50),="" salary="" real);="" eof;="" $ret="$db-">exec($sql);
if(!$ret){
echo $db->lastErrorMsg();
} else {
echo "Yes, Table created successfully
\n";
}// $db->close();
$sql =<<<eof insert="" into="" company="" (id,name,age,address,salary)="" values="" (1,="" 'maxsu',="" 26,="" 'haikou',="" 20000.00="" );="" (2,="" 'allen',="" 25,="" 'guangzhou',="" 15000.00="" (3,="" 'tenny',="" 23,="" 'shanghai',="" (4,="" 'weiwang',="" 'beijing="" ',="" 65000.00="" eof;="" $ret="$db-">exec($sql);
if(!$ret){
echo $db->lastErrorMsg();
} else {
echo "Yes, Some Records has Inserted successfully
\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 $db->changes(), " Record(ID<=2) deleted successfully
\n";
}// 查询表中的数据
echo " Select Data from company table :
";$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 '----------------------------------
';
}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。