加强版phplib的DB类

答案：
复制代码 代码如下:

<?php 
/**************************************************************************************************************** 
为了便于自己的开发，又不想使用ADODB、PEAR::DB这样的庞然大物， 
就用在PHPLib DB类的基础上、参考PEAR::DB类，封装的DB类，简单好使，非常方便。 
MySQL有效 

[ 连接数据库 ] 

//包含数据库处理类文件 
include_once("database.inc.php"); 

//本地数据库配置 
define("DB_HOST",    "localhost"); //数据库服务器 
define("DB_USER_NAME",   "root");  //数据库用户名 
define("DB_USER_PASS",   "");   //密码 
define("DB_DATABASE",   "test");  //数据库 

//连接本地数据库 
$db = new DB_Sql(); 
$db->connect(DB_DATABASE, DB_HOST, DB_USER_NAME, DB_USER_PASS); 

[ 使用方法 ] 

//获取所有记录 
$sql = "SELECT * FROM table1"; 
$all_record = $db->get_all($sql); 

//获取一条 
$sql = "SELECT * FROM table1 WHERE id = '1'"; 
$one_row = $db->get_one($sql); 

//分页查询，提取20条记录 
$sql = "SELECT * FROM table1"; 
$page_record = $db->limit_query($sql, $start=0, $offset=20, $order="ORDER BY id DESC"); 

//提取指定数目的记录 
$sql = "SELECT * FROM table1"; 
$limit_record = $db->get_limit($sql,10); 

//统计记录数，统计所有类型为学生的 
$count = $db->count("table1", "id", "type = 'student'"); 

//插入一条记录 
$info_array = array( 
  "name"  => "heiyeluren", 
  "type"  => "student", 
  "age"  => "22", 
  "gender" => "boy" 
 ); 
$db->insert("table1", $info_array); 

//更新一条记录 
$info_array = array( 
  "name"  => "heiyeluren", 
  "type"  => "teacher", 
  "age"  => "22", 
  "gender" => "boy" 
 ); 
$db->update("table1", $info_array, "name = 'heiyeluren'"); 

//删除记录 
$db->delete("table1", "name = 'heiyeluren'"); 

//执行一条无结果集的SQL 
$db->execute("DELETE FROM table1 WHERE name = 'heiyeluren'"); 

********************************************************************************************************/ 

/** 
 * 文件: database.inc.php 
 * 描述: 数据库操作类 
 * 说明: 本库使用PHPLib DB库作为核心, 同时增加一些实用方法, 详细参考注释 
 */ 

class DB_Sql  
{ 

  /* public: connection parameters */ 
  var $Host     = ""; 
  var $Database = ""; 
  var $User     = ""; 
  var $Password = ""; 

  /* public: configuration parameters */ 
  var $Auto_Free     = 1;     ## Set to 1 for automatic mysql_free_result() 
  var $Debug         = 0;     ## Set to 1 for debugging messages. 
  var $Halt_On_Error = "yes"; ## "yes" (halt with message), "no" (ignore errors quietly), "report" (ignore errror, but spit a warning) 
  var $PConnect      = 0;     ## Set to 1 to use persistent database connections 
  var $Seq_Table     = "db_sequence"; 

  /* public: result array and current row number */ 
  var $Record   = array(); 
  var $Row; 

  /* public: current error number and error text */ 
  var $Errno    = 0; 
  var $Error    = ""; 

  /* public: this is an api revision, not a CVS revision. */ 
  var $type     = "mysql"; 
  //var $revision = "1.2"; 

  /* private: link and query handles */ 
  var $Link_ID  = 0; 
  var $Query_ID = 0; 

  var $locked   = false;      ## set to true while we have a lock 

  /* public: constructor */ 
  function DB_Sql() { 
    $this->query($query); 
  } 

  /* public: some trivial reporting */ 
  function link_id() { 
    return $this->Link_ID; 
  } 

  function query_id() { 
    return $this->Query_ID; 
  } 

  /* public: connection management */ 
  function connect($Database = "", $Host = "", $User = "", $Password = "") { 
    /* Handle defaults */ 
    if ("" == $Database)  
      $Database = $this->Database; 

    if ("" == $Host)  
      $Host     = $this->Host; 

    if ("" == $User)  
      $User     = $this->User; 

    if ("" == $Password)  
      $Password = $this->Password; 

       
    /* establish connection, select database */ 
    if ( 0 == $this->Link_ID ) { 

      if(!$this->PConnect) { 
        $this->Link_ID = mysql_connect($Host, $User, $Password); 
      } else { 
        $this->Link_ID = mysql_pconnect($Host, $User, $Password);  
      } 
      if (!$this->Link_ID) { 
        $this->halt("connect($Host, $User, \$Password) failed."); 
        return 0; 
      } 

      if (!@mysql_select_db($Database,$this->Link_ID)) { 
        $this->halt("cannot use database ".$Database); 
        return 0; 
      } 
    } 

    return $this->Link_ID; 
  } 

  /* public: discard the query result */ 
  function free() { 
      @mysql_free_result($this->Query_ID); 
      $this->Query_ID = 0; 
  } 

  /* public: perform a query */ 
  function query($Query_String) { 
    /* No empty queries, please, since PHP4 chokes on them. */ 
    if ($Query_String == "") 
      /* The empty query string is passed on from the constructor, 
       * when calling the class without a query, e.g. in situations 
       * like these: '$db = new DB_Sql_Subclass;' 
       */ 
      return 0; 

    if (!$this->connect()) { 
      return 0; /* we already complained in connect() about that. */ 
    }; 

    # New query, discard previous result. 
    if ($this->Query_ID) { 
      $this->free(); 
    } 

    if ($this->Debug) 
      printf("Debug: query = %s<br>\n", $Query_String); 

    $this->Query_ID = @mysql_query($Query_String,$this->Link_ID); 
    $this->Row   = 0; 
    $this->Errno = mysql_errno(); 
    $this->Error = mysql_error(); 
    if (!$this->Query_ID) { 
      $this->halt("Invalid SQL: ".$Query_String); 
    } 

    # Will return nada if it fails. That's fine. 
    return $this->Query_ID; 
  } 

  /* public: walk result set */ 
  function next_record() { 
    if (!$this->Query_ID) { 
      $this->halt("next_record called with no query pending."); 
      return 0; 
    } 

    $this->Record = @mysql_fetch_array($this->Query_ID); 
    $this->Row   += 1; 
    $this->Errno  = mysql_errno(); 
    $this->Error  = mysql_error(); 

    $stat = is_array($this->Record); 
    if (!$stat && $this->Auto_Free) { 
      $this->free(); 
    } 
    return $stat; 
  } 

  /* public: position in result set */ 
  function seek($pos = 0) { 
    $status = @mysql_data_seek($this->Query_ID, $pos); 
    if ($status) 
      $this->Row = $pos; 
    else { 
      $this->halt("seek($pos) failed: result has ".$this->num_rows()." rows."); 

      /* half assed attempt to save the day,  
       * but do not consider this documented or even 
       * desireable behaviour. 
       */ 
      @mysql_data_seek($this->Query_ID, $this->num_rows()); 
      $this->Row = $this->num_rows(); 
      return 0; 
    } 

    return 1; 
  } 

  /* public: table locking */ 
  function lock($table, $mode = "write") { 
    $query = "lock tables "; 
    if(is_array($table)) { 
      while(list($key,$value) = each($table)) { 
        // text keys are "read", "read local", "write", "low priority write" 
        if(is_int($key)) $key = $mode; 
        if(strpos($value, ",")) { 
          $query .= str_replace(",", " $key, ", $value) . " $key, "; 
        } else { 
          $query .= "$value $key, "; 
        } 
      } 

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