tablename = $tablename;
// 数据库连接
$this->link=@MySQL_connect(HOST,USER,PASS) or die('数据库连接失败!');
mysql_set_charset("utf8");
mysql_select_db(DBNAME,$this->link);
//获取当前表的结构和主键名
$this->getFields();
}
//私有方法,加载当前表中的所有字段信息
private function getFields(){
$sql = "desc {$this->tablename}";
$result = mysql_query($sql,$this->link);
//解析表结构信息
while($row = mysql_fetch_assoc($result)){
$this->fields[]=$row['Field']; //获取字段名
//判断并获取主键名
if($row['Key']=="PRI"){
$this->pk = $row['Field'];
}
}
mysql_free_result($result);
}
//封装各种条件或获取所有对应数据信息
public function select()
{
$list = array();
//拼装sql语句
$sql ="select * from {$this->tablename}";
//判断并封装where条件
if(count($this->where)>0){
$sql.=" where ".implode(" and ",$this->where);
}
//判断并封装order排序条件
if($this->order){
$sql.=" order by ".$this->order;
}
//判断并封装分页条件
if($this->limit){
$sql.=" limit ".$this->limit;
}
//执行查询,获取数据。
$result = mysql_query($sql,$this->link);
echo $sql;
//解析结果集
while($row = mysql_fetch_assoc($result)){
$list[]=$row;
}
mysql_free_result($result); //释放结果集
return $list;
}
//获取封装条件的总数据条数
public function total()
{
$list = array();
//拼装sql语句
$sql ="select count(*) from {$this->tablename}";
//判断并封装where条件
if(count($this->where)>0){
$sql.=" where ".implode(" and ",$this->where);
}
//执行查询,获取数据。
$result = mysql_query($sql,$this->link);
return mysql_result($result,0,0);
}
//获取所有数据
public function findAll()
{ $list = array();
//拼装sql语句
$sql ="select * from {$this->tablename}";
//执行查询,获取数据。
$result = mysql_query($sql,$this->link);
//解析结果集
while($row = mysql_fetch_assoc($result)){
$list[]=$row;
}
mysql_free_result($result); //释放结果集
return $list;
}
/**
* 获取指定id号的单条数据信息
* @param int id 获取信息的主键id值。
* @return array 返回值,找到数据则返回数组,否则返回null
*/
public function find($id)
{
$sql = "select * from {$this->tablename} where {$this->pk}={$id}";
//执行查询
$result = mysql_query($sql,$this->link);
//判断是有信息
if($result && mysql_num_rows($result)>0){
return mysql_fetch_assoc($result);
}else{
return null;
}
}
//执行删除
public function delete($id)
{
$sql = "delete from {$this->tablename} where {$this->pk}={$id}";
//执行删除
mysql_query($sql,$this->link);
//返回影响行数
return mysql_affected_rows($this->link);
}
//执行信息添加
public function insert($data=array()){
//判断参数是否有值,若没有则尝试从post自己获取
if(empty($data)){
$data = $_POST;
}
//过滤所有字段
$fieldlist = array();
$valuelist = array();
foreach($data as $k=>$v){
//判断是否是有效字段
if(in_array($k,$this->fields)){
$fieldlist[] = $k;
$valuelist[] = $v;
}
}
//拼装sql语句
$sql = "insert into {$this->tablename}(".implode(",",$fieldlist).") values('".implode("','",$valuelist)."')";
echo $sql;
//执行添加
mysql_query($sql,$this->link);
//返回自增信息
return mysql_insert_id($this->link);
}
//执行信息修改
public function update($data=array()){
//判断参数是否有值,若没有则尝试从post自己获取
if(empty($data)){
$data = $_POST;
}
//过滤所有字段
$fieldlist = array();
foreach($data as $k=>$v){
//判断是否是有效字段
if(in_array($k,$this->fields) && $k!=$this->pk){
$fieldlist[] = "{$k}='{$v}'";
}
}
//拼装sql语句
$sql = "update {$this->tablename} set ".implode(",",$fieldlist)." where {$this->pk}=".$_POST[$this->pk];
echo $sql;
//执行添加
mysql_query($sql,$this->link);
//返回自增信息
return mysql_insert_id($this->link);
}
//封装搜索条件方法
public function where($data)
{
$this->where[]=$data;
return $this;
}
//封装排序方法
public function order($data)
{
$this->order=$data;
return $this;
}
//封装分页方法
public function limit($m,$n=0)
{
if($n>0){
$this->limit = $m.",".$n;
}else{
$this->limit = $m;
}
return $this;
}
}
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