一个不错的MySQL类_PHP教程_编程技术
包含CRUD,事务,树递归查询,分页等. 演示简单的魅力. 所有的参数都escape了,不存在注入问题.
/*
* Anthony.chen
* 2010 reserved
*/
class DB {
// Query types
const SELECT = 1;
const INSERT = 2;
const UPDATE = 3;
const DELETE = 4;
const T = 't';
const F = 'f';
/*
* Supporting return multiple data;
*/
public static function insert_table($table_name,$data,$return_id='id',$db='default'){
if (!is_array($data)){
return false;
}
if (is_null($return_id)){
self::query(self::SELECT,self::insert($table_name,array_keys($data))->values(array_values($data)))->execute($db);
return true;
}
if (is_string($return_id)){
$id = self::query(self::SELECT,self::insert($table_name,array_keys($data))->values(array_values($data))." returning ".$return_id)->execute($db)->get($return_id);
return $id;
}else{
if (is_array($return_id)){
$ids = implode(',',$return_id);
$r_ids = self::query(self::SELECT,self::insert($table_name,array_keys($data))->values(array_values($data))." returning ".$ids)->execute($db)->current();
return $r_ids;
}
}
return false;
}
public static function update_table($table_name,$id,$data,$id_name='id',$db='default'){
if (!is_array($data)){
return false;
}
return self::update($table_name)->set($data)->where($id_name ,'=',$id)->execute($db);
}
public static function quote($s,$db='default'){
if(!is_array($s)){
return Database::instance($db)->quote($s);
}else{ //Quote array and implode
$_qs = array();
foreach ($s as $ele){
$_qs[] = self::quote($ele,$db);
}
$_quoteString = implode(',',$_qs);
return $_quoteString;
}
}
public static function escape($s,$db='default'){
return Database::instance($db)->escape($s);
}
public static function quote_table($s,$db='default'){
return Database::instance($db)->quote_table($s);
}
public static function getConnection($db = 'default'){
return Database::instance($db)->getConnection();
}
public static function getChildren($table,$returnSql = false ,$pid= '0',$idname='id',$pidname='pid' ,$db='default'){
$_sql = 'select * from '.$table.' where '.$pidname.'='.self::escape($pid,$db).
" and $idname <>".DB::escape($pid,$db);
if($returnSql){
return $_sql;
}
$_res = self::query(self::SELECT,$_sql)->execute($db)->as_array();
if($_res){
return $_res;
}else{
return false;
}
}
/*
*
*/
public static function getTree($tableName,$returnSql=false,$startWith='0',$idCol='id',$pidCol='pid', $orderCol='id', $maxDepth=0,$level = 0,$delimiter = ';',$db='default'){
$_funcParas = array();
$_funcParas[] = self::quote($tableName,$db); //TableView
$_funcParas[] = self::quote($idCol,$db); //ID column
$_funcParas[] = self::quote($pidCol,$db); //Parent ID Column
$_funcParas[] = self::quote($orderCol,$db); //Default Order by ASC
$_funcParas[] = self::quote($startWith,$db); //Begin NODE
$_funcParas[] = self::quote($maxDepth,$db); //Begin Depth of traverse
$_funcParas[] = self::quote($delimiter,$db); //Delimitor,default ';'
$_sql = 'select * from connectby('
.implode(',',$_funcParas).')'
.' as t(id int, pid int, level int, branch text, pos int)';
if($level > 0){
$_sql .= ' where level >='.self::quote($level);
}
if($returnSql) return $_sql;
$_res = self::query(self::SELECT,$_sql,true)->execute($db)->as_array();
if($_res){
return $_res;
}else{
return false;
}
}
public static function begin($db='default'){
DB::query(Database::UPDATE, "BEGIN")->execute($db);
}
public static function commit($db='default'){
DB::query(Database::UPDATE, "COMMIT")->execute($db);
}
public static function rollback($db='default'){
DB::query(Database::UPDATE, "ROLLBACK")->execute($db);
}
/**
* Create a new [Database_Query] of the given type.
*
* // Create a new SELECT query
* $query = DB::query(Database::SELECT, 'SELECT * FROM users');
*
* // Create a new DELETE query
* $query = DB::query(Database::DELETE, 'DELETE FROM users WHERE id = 5');
*
* Specifying the type changes the returned result. When using
* `Database::SELECT`, a [Database_Query_Result] will be returned.
* `Database::INSERT` queries will return the insert id and number of rows.
* For all other queries, the number of affected rows is returned.
*
* @param integer type: Database::SELECT, Database::UPDATE, etc
* @param string SQL statement
* @return Database_Query
*/
public static function query($type, $sql,$as_object = false)
{
return new Database_Query($type, $sql,$as_object);
}
/**
* Create a new [Database_Query_Builder_Select]. Each argument will be
* treated as a column. To generate a `foo AS bar` alias, use an array.
*
* // SELECT id, username
* $query = DB::select('id', 'username');
*
* // SELECT id AS user_id
* $query = DB::select(array('id', 'user_id'));
*
* @param mixed column name or array($column, $alias) or object
* @param ...
* @return Database_Query_Builder_Select
*/
public static function select($columns = NULL)
{
return new Database_Query_Builder_Select(func_get_args());
}
/**
* Create a new [Database_Query_Builder_Select] from an array of columns.
*
* // SELECT id, username
* $query = DB::select_array(array('id', 'username'));
*
* @param array columns to select
* @return Database_Query_Builder_Select
*/
public static function select_array(array $columns = NULL)
{
return new Database_Query_Builder_Select($columns);
}
/**
* Create a new [Database_Query_Builder_Insert].
*
* // INSERT INTO users (id, username)
* $query = DB::insert('users', array('id', 'username'));
*
* @param string table to insert into
* @param array list of column names or array($column, $alias) or object
* @return Database_Query_Builder_Insert
*/
public static function insert($table = NULL, array $columns = NULL)
{
return new Database_Query_Builder_Insert($table, $columns);
}
/**
* Create a new [Database_Query_Builder_Update].
*
* // UPDATE users
* $query = DB::update('users');
*
* @param string table to update
* @return Database_Query_Builder_Update
*/
public static function update($table = NULL)
{
return new Database_Query_Builder_Update($table);
}
/**
* Create a new [Database_Query_Builder_Delete].
*
* // DELETE FROM users
* $query = DB::delete('users');
*
* @param string table to delete from
* @return Database_Query_Builder_Delete
*/
public static function delete($table = NULL)
{
return new Database_Query_Builder_Delete($table);
}
/**
* Create a new [Database_Expression] which is not escaped. An expression
* is the only way to use SQL functions within query builders.
*
* $expression = DB::expr('COUNT(users.id)');
*
* @param string expression
* @return Database_Expression
*/
public static function expr($string){
return new Database_Expression($string);
}
/*
* Gettting paginated page
*/
public static function getPage($_sql,&$page,$orderBy ='updated desc', $dataPro='data',$pagePro = 'pagination',
$config = NULL,$db = 'default',$as_object= true){
$_csql = 'select count(1) as c from ('.$_sql.') st';
$_c = DB::query(DB::SELECT,$_csql)->execute($db)->get('c');
if($config){
$config['total_items'] = $_c;
$_pagination = new Pagination($config);
}else{
$config = array();
$config['total_items'] = $_c;
$_pagination = new Pagination($config);
}
$_sql .= ' order by '.$orderBy;
if($_pagination->offset){
$_sql .= ' offset '.$_pagination->offset;
}
$_sql .= ' limit '.$_pagination->items_per_page;
$_data = DB::query(DB::SELECT,$_sql,$as_object)->execute($db)->as_array();
if(!$_data){
$page->{$dataPro} = false;
$page->{$pagePro} = false;
return false;
}
$page->{$dataPro} = $_data;
$page->{$pagePro} = $_pagination;
return true;
}
/*
* Get All roles
* level to control the statrt
*/
public static function getRoleTreeSql($role_id,$quote = false,$role_table,$level=0,$db='default'){
$_sql = 'select id from ('.self::getTree($role_table,true,$role_id,'id','pid','id',
0, //Maxdepth
$level, //Level
';',$db).') utree';
if(!$quote) return $_sql;
else return '('.$_sql.')';
}
/*
* Return sub query on Objects authorization
* Child role objects and owned objects
* Parent control
*/
public static function getCURTreeSql($role_id,$user_id,$role_table,$quote = true,
$role='role_id',$owner = 'owner_id' ,$db='default'){
$_sql = ' '.$role.' in '.self::getRoleTreeSql($role_id,true,$role_table,
1, //Level start with 1
$db). ' or '.$owner.'='.DB::quote($user_id);
if(!$quote) return $_sql;
else return '('.$_sql.')';
}
}
