操作类文件
db.class.php
pdo = new PDO("mysql:host=".$config['db_host'].";port=".$config['db_port'].";dbname=".$config['db_name'],$config['db_user'], $config['db_pass']);
}catch(PDOException $e){
// 数据库无法链接，如果您是第一次使用，请先配置数据库！
exit($e->getMessage());
}
$this->prefix = $config['db_prefix'];
$this->pdo->exec("SET NAMES UTF8");
}
// 配置表信息
public function set_table($table=null,$primary='id'){
if($table==null){ exit('Not found Table');}
$this->primary = $primary;
$this->table = $this->prefix.$table;
return $this;
}
// 获取数据
public function getData($sql)
{
if(!$result = $this->query($sql))return array();
if(!$this->Statement->rowCount())return array();
$rows = array();
while($rows[] = $this->Statement->fetch(PDO::FETCH_ASSOC)){}
$this->Statement=null;
array_pop($rows);
return $rows;
}
// 查询数据条数
public function getCount($conditions){
$where = '';
if(is_array($conditions)){
$join = array();
foreach( $conditions as $key => $value ){
$value = '\''.$value.'\'';
$join[] = "{$key} = {$value}";
}
$where = "WHERE ".join(" AND ",$join);
}else{
if(null != $conditions)$where = "WHERE ".$conditions;
}
$sql = "SELECT count(*) as Frcount FROM {$this->table} {$where}";
$result = $this->getData($sql);
return $result[0]['Frcount'];
}
// 获取单一字段内容
public function getField($where=null,$fields=null){
if( $record = $this->findAll($where, null, $fields, 1) ){
$res = array_pop($record);
return $res[$fields];
}else{
return FALSE;
}
}
// 递增数据
public function goInc($conditions,$field,$vp=1){
$where = "";
if(is_array($conditions)){
$join = array();
foreach( $conditions as $key => $value ){
$value = '\''.$value.'\'';
$join[] = "{$key} = {$value}";
}
$where = "WHERE ".join(" AND ",$join);
}else{
if(null != $conditions)$where = "WHERE ".$conditions;
}
$values = "{$field} = {$field} + {$vp}";
$sql = "UPDATE {$this->table} SET {$values} {$where}";
return $this->pdo->exec($sql);
}
// 递减
public function goDec($conditions,$field,$vp=1){
return $this->goInc($conditions,$field,-$vp);
}
// 修改数据
public function update($conditions,$row)
{
$where = "";
$row = $this->__prepera_format($row);
if(empty($row)){
return FALSE;
}
if(is_array($conditions)){
$join = array();
foreach( $conditions as $key => $condition ){
$condition = '\''.$condition.'\'';
$join[] = "{$key} = {$condition}";
}
$where = "WHERE ".join(" AND ",$join);
}else{
if(null != $conditions){
$where = "WHERE ".$conditions;
}
}
foreach($row as $key => $value){
$value = '\''.$value.'\'';
$vals[] = "{$key} = {$value}";
}
$values = join(", ",$vals);
$sql = "UPDATE {$this->table} SET {$values} {$where}";
//echo $sql.'
';
$res = $this->pdo->exec($sql);
if($res){
return $res;
}else{
var_dump($this->pdo->errorInfo());
}
}
// 查询所有
public function findAll($conditions=null,$order=null,$fields=null,$limit=null)
{
$where = '';
if(is_array($conditions)){
$join = array();
foreach( $conditions as $key => $value ){
$value = '\''.$value.'\'';
$join[] = "{$key} = {$value}";
}
$where = "WHERE ".join(" AND ",$join);
}else{
if(null != $conditions)$where = "WHERE ".$conditions;
}
if(is_array($order)){
$where .= ' ORDER BY ';
$where .= implode(',', $order);
}else{
if($order!=null)$where .= " ORDER BY ".$order;
}
if(!empty($limit))$where .= " LIMIT {$limit}";
$fields = empty($fields) ? "*" : $fields;
$sql = "SELECT {$fields} FROM {$this->table} {$where}";
return $this->getData($sql);
}
// 查询一条
public function find($where=null,$order=null,$fields=null,$limit=1)
{
if( $record = $this->findAll($where, $order, $fields, 1) ){
return array_pop($record);
}else{
return FALSE;
}
}
// 执行SQL语句并检查是否错误
public function query($sql){
$this->filter[] = $sql;
$this->Statement = $this->pdo->query($sql);
if ($this->Statement) {
return $this;
}else{
$msg = $this->pdo->errorInfo();
if($msg[2]) exit('数据库错误：' . $msg[2] . end($this->filter));
}
}
// 执行SQL语句函数
public function findSql($sql)
{
return $this->getData($sql);
}
// 根据条件 (conditions) 删除
public function delete($conditions)
{
$where = "";
if(is_array($conditions)){
$join = array();
foreach( $conditions as $key => $condition ){
$condition = '\''.$condition.'\'';
$join[] = "{$key} = {$condition}";
}
$where = "WHERE ( ".join(" AND ",$join). ")";
}else{
if(null != $conditions)$where = "WHERE ( ".$conditions. ")";
}
$sql = "DELETE FROM {$this->table} {$where}";
return $this->pdo->exec($sql);
}
// 新增数据
public function add($row)
{
if(!is_array($row)){
return FALSE;
}
$row = $this->__prepera_format($row);
if(empty($row)){
return FALSE;
}
foreach($row as $key => $value){
$cols[] = $key;
$vals[] = '\''.$value.'\'';
}
$col = join(',', $cols);
$val = join(',', $vals);
$sql = "INSERT INTO {$this->table} ({$col}) VALUES ({$val})";
if( FALSE != $this->pdo->exec($sql) ){
if( $newinserid = $this->pdo->lastInsertId() ){
return $newinserid;
}else{
$a=$this->find($row, "{$this->primary} DESC",$this->primary);
return array_pop($a);
}
}
return FALSE;
}
private function __prepera_format($rows)
{
$stmt = $this->pdo->prepare('DESC '.$this->table);
$stmt->execute();
$columns = $stmt->fetchAll(PDO::FETCH_COLUMN);
$newcol = array();
foreach( $columns as $col ){
$newcol[$col] = null;
}
return array_intersect_key($rows,$newcol);
}
}
实例化类
'localhost', // 数据库地址
'db_port' => 3306, // 默认mysql数据库端口
'db_name' => 'test', // 数据库名字
'db_user' => 'root', // 数据库用户名
'db_pass' => 'root', // 数据库密码
'db_prefix' => '', // 表前缀
];
// 实例化类
$db = new DB_API($config);
// 表名
$article = $db->set_table('article');
// 新增数据
$newdata = ['title'=>'this is a title'];
$r = $article->add($newdata);
if($r){
echo '新增成功！';
}else{
echo '操作失败！';
}
// 查询数据
$where = ['id'=>3];
$find = $article->find($where); //查询一条数据
$find = $article->findAll($where); // 查询多条数据
print_r($find);
// 更新数据
$where = ['title'=>'hello world666'];
$update = $article->update(['id'=>1],$where);
if($update ){
echo '更新成功！';
// 查询并打印
$newdata = $article->find('id=1');
print_r($newdata);
}else{
echo '更新失败！';
}
// 删除数据
$where = ['id'=>1];
$del = $article->delete($where);
if($del){
echo '删除成功！';
}else{
echo '删除失败！';
}
// 获取符合条件的记录数
$where = ['author'=>'TANKING'];
$count = $article->getCount($where);
echo $count;
// 执行原生SQL语句
$sql = 'select * from article where id=3';
$lists = $article->findSql($sql);
print_r($lists);
// 根据条件查询出对应的字段的值
$where = ['id'=>1];
$res = $article->getField($where,'title');
if ($res) {
echo $res;
}else{
echo "没有数据";
}
// 高级查询
// $conditions查询条件
// $order排序方法
// $fields指定字段
// $limit查询条数
$res = $article->findAll($conditions=null,$order='id asc',$fields=null,$limit=null);
if ($res) {
print_r($res);
}else{
print_r("没有数据");
}
Author:TANKING