sqlite database connection class_PHP tutorial

sqlite database connection class * The sqlite database connection class uses php and sqlite to perform connection operations.

SQLite database tutorial connection class
* The sqlite database connection class uses the php tutorial to connect to sqlite.

*/
class db_class {
var $conn=null;
var $querynum = 0;

/**
* Database connection, returns the database connection identifier
*
* @param string $ Database server host
* @param string $ Database server account
* @param string $ Database server password
* @param string $ database name
* @param bool $ Whether to maintain a persistent connection, 1 is a persistent connection, 0 is a non-persistent connection
* @return link_identifier $dbuser, $dbpw, $dbname,
​*/
function connect($dbhost, $pconnect = 0) {
$error = '';
$func = $pconnect == 1 ? 'sqlite_popen' : 'sqlite_open';
if (!$this -> conn = $func($dbhost, 0666, $error)) {
$this -> halt($error);
}

return $this -> conn;
}

/**
* Execute sql statement
*
* @param string $ sql statement
* @param string $ Default is empty, optional value is cache unbuffered
* @param int $ cache life cycle in seconds
* @return resource
​*/
function query($sql, $type = '', $expires = 3600, $dbname = '') {
$error = '';
$func = $type == 'unbuffered' ? 'sqlite_unbuffered_query' : 'sqlite_query';
if (preg_match("/^s*select/i", $sql)) {
$query = $func($this -> conn, $sql, sqlite_assoc, $error);
} else {
$query = sqlite_exec($this -> conn, $sql, $error);
}
if ($error) {
$this -> halt($error, $sql);
}

  $this -> querynum++;
  return $query;
 }
 /*
 *@param string $ table名
 *@param string $ where条件
 *@param string $ colum名
 
 *@param string $ limit数量 
 
 */
 function getlist($table , $wheres = "1=1",  $colums = '*' ,$limits = '3000',$orderbys="id desc") {
  $query = $this -> query("select ".$colums." from ".$table." where ".$wheres." order by  ".$orderbys."  limit ".$limits, $type, $expires, $dbname);
  while($rs = $this -> fetch_array($query)){
   $datas[]=$rs;
   }
  //print_r("select ".$colums." from ".$table." where ".$wheres." limit ".$limits);
  //print_r($rs);die();
  $this -> free_result($query);
  return $datas ;
 }
 function add_one($table , $colums ,$data ) {
  //die("insert into ".$table." (".$colums.") values(".$data.")");
  $query = $this -> query("insert into ".$table." (".$colums.") values(".$data.")", $type, $expires, $dbname);
  //return $this->insert_id();
  return $query;
 }
 function delist($table , $idarray,$wheres="no") {
  if($wheres=='no')
   $query = $this -> query("delete from ".$table." where id in(".$idarray.")", $type, $expires, $dbname);
  else
   $query = $this -> query("delete from ".$table." where ".$wheres, $type, $expires, $dbname);
  return $query;
 }
 function updatelist($table , $updatedata,$idarray) {
  $query = $this -> query("update ".$table." set ". $updatedata."  where id in(".$idarray.")", $type, $expires, $dbname);
  return $query;
 }
 //update max_vote set maxtitle='$title',maxban='$ban',
 /**
* Execute the sql statement and get only one record
*
* @param string $ sql statement
* @param string $ Default is empty, optional value is cache unbuffered
* @param int $ cache life cycle in seconds
* @return array
​*/
 function get_one($sql, $type = '', $expires = 3600, $dbname = '') {
  $query = $this -> query($sql, $type, $expires, $dbname);
  $rs = $this -> fetch_array($query);
  $this -> free_result($query);
  return $rs ;
 }

 /**
* Get a row from the result set as an associative array
*
* @param resource $ Database query result resource
* @param string $ defines return type
* @return array
​*/
 function fetch_array($query, $result_type = sqlite_assoc) {
  return sqlite_fetch_array($query, $result_type);
 }

 /**
* Get the number of record rows affected by the previous sqlite operation
*
* @return int
​*/
 function affected_rows() {
  return sqlite_changes($this -> conn);
 }

 /**
* Get the number of rows in the result set
*
* @return int
​*/
 function num_rows($query) {
  return sqlite_num_rows($query);
 }

 /**
* Return the number of fields in the result set
*
* @return int
​*/
 function num_fields($query) {
  return sqlite_num_fields($query);
 }

 /**
*
* @return array Reserved, generally not used.
​*/
 function result($query, $row) {
  return @sqlite_fetch_all($query, sqlite_assoc);
 }
 /**
* There is no corresponding function in sqlite
​*/
 function free_result($query) {
  return ;
 }

 /**
* Get the id
generated by the previous insert operation *
* @return int
​*/
 function insert_id() {
  return sqlite_last_insert_rowid($this -> connid);
 }

 /**
*
* @return array only gets the numeric index
​*/
 function fetch_row($query) {
  return sqlite_fetch_array($query, sqlite_num);
 }
 /**
 */
 function fetch_assoc($query) {
  return $this -> fetch_array($query, sqlite_assoc);
 }
 /**
  *
  * @return string
 *
  *
  * @return string
 * @return string

  *

  * @return int
 */
 function version() {

  return sqlite_libversion();

 }

 function close() {
  return sqlite_close($this -> conn);
 }

 /**

* Display mysql tutorial error message

​* * @return string */
 function error() {
  return sqlite_error_string($this -> errno);
 }

 /*** * @return int */
 function errno() {

  return sqlite_last_error($this -> conn);

 }

 /*** 显示mysql教程错误信息*/
 function halt($message = '', $sql = '') {
  exit("sqlitequery:$sql
sqliteerror:" . $this -> error() . "
sqliteerrno:" . $this -> errno() . "
message:$message");
 }
}

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