一个数据库操作类
程序员文章站
2022-06-06 08:26:41
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[PHP]代码
<?php //数据库操作类 if(!defined('SQL_LAYER')) { define('SQL_LAYER',"mysql"); class sql_db { var $db_connect_id; var $query_result; var $row=array(); var $rowset=array(); var $num_queries=0; function __construct($sqlserver,$sqluser,$sqlpassword,$database,$persistency=true) { $this->persistency=$persistency; $this->user=$sqluser; $this->password=$sqlpassword; $this->server=$sqlserver; $this->dbname=$database; if($this->persistency) { $this->db_connect_id=mysql_pconnect($this->server,$this->user,$this->password); } else { $this->db_connect_id=mysql_connect($this->server,$this->user,$this->password); } if($this->db_connect_id) { if($database!="") { $this->dbname=$database; $dbselect=mysql_select_db($this->dbname); if(!$dbselect) { mysql_close($this->db_connect_id); $this->db_connect_id=$dbselect; } } return $this->db_connect_id; } else { return false; } } //其他基本方法 function sql_close()//关闭数据库 { if($this->db_connect_id) { if($this->query_result) { //mysql_free_result() 仅需要在考虑到返回很大的结果集时会占用多少内存时调用。 //在脚本结束后所有关联的内存都会被自动释放。 mysql_free_result($this->query_result); } //关闭数据库 $result=mysql_close($this->db_connect_id); return $result; } else { return false; } } //SQL语句执行函数 function sql_query($query="",$transaction=FALSE) { //释放内存 unset($this->query_result); if($query!="") { $this->num_queries++; $this->query_result=mysql_query($query,$this->db_connect_id); } if($this->query_result) { //如果存在查询结果,则释放内存 unset($this->row[$this->query_result]); unset($this->rowset[$this->query_result]); return $this->query_result; } else { return ($transaction==END_TRANSACTION) ? true : false; } } //定义获取数据的行数 function sql_numrows($query_id=0) { if(!$query_id) { $query_id=$this->query_result; } if($query_id) { $result=mysql_num_rows($query_id); return $result; } else { return false; } } //取得前一次 MySQL 操作所影响的记录行数 function sql_affectedrows() { if($this->db_connect_id) { $result=mysql_affected_rows($this->db_connect_id); return $result; } else { return false; } } //取得结果集中字段的数目 function sql_numfields($query_id=0) { if(!$query_id) { $query_id=$this->query_result; } if($query_id) { $result=mysql_num_fields($query_id); return $result; } else { return false; } } //获取结果中指定字段的字段名 function sql_fieldname($offset,$query_id=0) { if(!$query_id) { $query_id=$this->query_result; } if($query_id) { $result=mysql_field_name($query_id,$offset); return $result; } else { return false; } } //获取结果集中指定字段的类型 function sql_fieldtype($offset,$query_id=0) { if(!$query_id) { $query_id=$this->query_result; } if($query_id) { $result=mysql_field_type($query_id,$offset); return $result; } else { return false; } } function sql_fetchrow($query_id=0) { if(!$query_id) { $query_id=$this->query_result; } if($query_id) { $this->row[$query_id]=mysql_fetch_array($query_id); return $this->row[$query_id]; } else { return false; } } function sql_fetchrowset($query_id = 0) { if(!$query_id) { $query_id = $this->query_result; } if($query_id) { unset($this->rowset[$query_id]); unset($this->row[$query_id]); while($this->rowset[$query_id] = @mysql_fetch_array($query_id)) { $result[] = $this->rowset[$query_id]; } return $result; } else { return false; } } function sql_fetchfield($field, $rownum = -1, $query_id = 0) { if(!$query_id) { $query_id = $this->query_result; } if($query_id) { if($rownum > -1) { //取得结果的值 $result = @mysql_result($query_id, $rownum, $field); } else { if(empty($this->row[$query_id]) && empty($this->rowset[$query_id])) { if($this->sql_fetchrow()) { $result = $this->row[$query_id][$field]; } } else { if($this->rowset[$query_id]) { $result = $this->rowset[$query_id][0][$field]; } else if($this->row[$query_id]) { $result = $this->row[$query_id][$field]; } } } return $result; } else { return false; } } //行选择函数 function sql_rowseek($rownum, $query_id = 0) { if(!$query_id) { //获取$query_id的值 $query_id = $this->query_result; } if($query_id) { //移动内部结果的指针 $result = @mysql_data_seek($query_id, $rownum); return $result; } else { return false; } } function sql_nextid() { if($this->db_connect_id) { //取得上一步 INSERT 操作产生的 ID $result = @mysql_insert_id($this->db_connect_id); return $result; } else { return false; } } function sql_freeresult($query_id=0) { if(!$query_id) { $query_id=$this->query_result; } if($query_id) { //释放给定的变量的内存 unset($this->row[$query_id]); unset($this->rowset[$query_id]); //释放内存 mysql_free_result($query_id); return true; } else { return false; } } //SQL语句执行错误的函数 function sql_error($query_id=0) { $result["message"]=mysql_error($this->db_connect_id); $result["code"]=mysql_errno($this->db_connect_id); return $result; } } } ?>
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