纯PHP下 Mysql PDO 使用方法小记
1 配置信息
$config = array('db' => array(
'host' => '127.0.0.1',
'user' => 'root',
'pass' => '',
'db' => 'test_db',
'dns' => 'mysql:dbname=test_db;host=127.0.0.1;charset=utf8'
)
)
分别配置数据库链接，用户名，密码，库，dns信息（包括数据库名，数据库链接ip，以及字符集）注意：如果不设置字符集，即使数据库已经设置了utf8，存入数据库的中文数据仍可能为乱码（需要保持代码、数据库设置、链接数据库时的字符集都保持为utf8）
2 链接数据库
try {$db = new PDO($config['db']['dns'], $config['db']['user'], $config['db']['pass']);
} catch (PDOException $e) {
echo 'Connection failed: ' . $e->getMessage();
exit;
}
3.1 查询// 查询$sql1 = "SELECT * FROM tbl_test1 WHERE condition1 = :condition1 and condition2 = :condition2";
$sql_data1 = Array(
":condition1" => 1,
":condition2" => "abc"
);
$sth1 = $db->prepare($sql1);
$sth1->execute($sql_data1);
// 获取一条
$result1 = $sth1->fetch(PDO::FETCH_ASSOC);
// 获取所有
// $result1 = $sth1->fetchAll(PDO::FETCH_ASSOC);
// 判断是否成功
if($result1){
// 查询成功
}else{
// 查询失败
}
3.2 更新// 更新$sql2 = "UPDATE tbl_test1 SET `key1` = :val1, `key2` = :val2 WHERE condition1 = :condition1 and condition2 = :condition2";
$sql_data2 = Array(
":val1" => 1,
":val2" => "hello",
":condition1" => 1,
":condition2" => "abc"
);
$sth2 = $db->prepare($sql2);
$sth2->execute($sql_data2);
// 判断是否成功
if($sth2->rowCount() >0){
// 更新成功
}else{
// 更新失败
}
3.3 插入// 插入$sql3 = "INSERT INTO tbl_test1 (`key1`,`key2`,`key3`,`key4`,`key5`) VALUES ( :val1 , :val2 , :val3 , :val4 , :val5 )";
$sql_data3 = Array(
"val1" => 1,
"val2" => "hello",
"val3" => 100.25,
"val4" => "随便写写"
"val5" => "2015-10-30"
);
$sth3 = $db->prepare($sql3);
$result3 = $sth3->execute($sql_data3);
// 判断是否成功
if($result3){
// 插入成功
// 最新插入的数据的自增长id
// $db->lastInsertId();
}else{
// 插入失败
}
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