class_mysql.php,数据库操作文件
dbstuff类中最重要的方法就是connect()和query()方法,connect负责开启数据库连接,具体取数据就靠query了,query的核心代码如下:
$func = $type == ‘UNBUFFERED’ && @function_exists(‘mysql_unbuffered_query’) ?
‘mysql_unbuffered_query’ : ‘mysql_query’;
if(!($query = $func($sql, $this->link)) && $type != ‘SILENT’) {
$this->halt(‘MySQL Query Error’, $sql);
}
声明变量$func,进行type判断后,赋值为“mysql_query”,然后$func(),就等于mysql_query().
query并不仅仅负责查询,数据的插入和更新都是通过query来完成的,在function_common.php中:
//添加数据
function inserttable($tablename, $insertsqlarr, $returnid=0, $replace = false) {
global $_SGLOBAL;
$insertkeysql = $insertvaluesql = $comma = ”;
foreach ($insertsqlarr as $insert_key => $insert_value) {
$insertkeysql .= $comma.’`’.$insert_key.’`';
$insertvaluesql .= $comma.’\”.$insert_value.’\”;
$comma = ‘, ‘;
}
$method = $replace?’REPLACE’:'INSERT’;
$_SGLOBAL['db']->query($method.’ INTO ‘.tname($tablename).’ (‘.$insertkeysql.’) VALUES (‘.$insertvaluesql.’) ‘);
if($returnid && !$replace) {
return $_SGLOBAL['db']->insert_id();
}
}
//更新数据
function updatetable($tablename, $setsqlarr, $wheresqlarr) {
global $_SGLOBAL;
$setsql = $comma = ”;
foreach ($setsqlarr as $set_key => $set_value) {
$setsql .= $comma.’`’.$set_key.’`’.’=\”.$set_value.’\”;
$comma = ‘, ‘;
}
$where = $comma = ”;
if(empty($wheresqlarr)) {
$where = ‘1′;
} elseif(is_array($wheresqlarr)) {
foreach ($wheresqlarr as $key => $value) {
$where .= $comma.’`’.$key.’`’.’=\”.$value.’\”;
$comma = ‘ AND ‘;
}
} else {
$where = $wheresqlarr;
}
$_SGLOBAL['db']->query(‘UPDATE ‘.tname($tablename).’ SET ‘.$setsql.’ WHERE ‘.$where);
}
//删除数据
function_delete.php
$_SGLOBAL['db']->query(“DELETE FROM “.tname(‘comment’).” WHERE cid IN (“.simplode($newcids).”)”);
UCHOME二次开发之数据库操作原理
发布时间:2012-11-16 浏览:3026