基于php和mysql的简单的dao类实现crud操作功能_PHP教程

代码如下:
//require_once('FirePHPCore/FirePHP.class.php');
//$firephp = FirePHP::getInstance(true); // debugger in firefox
class SimpleDao {
private $_table = null;
private static $_con = null;

public function SimpleDao() {
if ($this->_con == null) {
$this->_con = @mysql_connect("localhost", "root", "123456");
if ($this->_con == FALSE) {
echo("connect to db server failed.");
$this->_con = null;
return;
}
//$firephp->log("new DAO object");
@mysql_select_db("swan", $this->_con);
}
}

public function table($tablename) {
$this->_table = $tablename;
return $this;
}

public function query($sql) {
$result = @mysql_query($sql);
$ret = [];
if ($result) {
while ($row = mysql_fetch_array($result)) {
$ret[] = $row;
}
}
return $ret;
}

public function get($where = null) {
$sql = "select * from ".$this->_table;
$sql = $sql.$this->_getWhereString($where);
//echo "[get]".$sql."
";
return $this->query($sql);
}

public function insert($params) {
if ($params == null || !is_array($params)) {
return -1;
}
$keys = $this->_getParamKeyString($params);
$vals = $this->_getParamValString($params);
$sql = "insert into ".$this->_table."(".$keys.") values(".$vals.")";
//echo "[insert]".$sql."
";
$result = @mysql_query($sql);
if (! $result) {
return -1;
}
return @mysql_insert_id();
}

public function update($params, $where = null) {
if ($params == null || !is_array($params)) {
return -1;
}
$upvals = $this->_getUpdateString($params);
$wheres = $this->_getWhereString($where);
$sql = "update ".$this->_table." set ".$upvals." ".$wheres;
//echo "[update]".$sql."
";
$result = @mysql_query($sql);
if (! $result) {
return -1;
}
return @mysql_affected_rows();
}

public function delete($where) {
$wheres = $this->_getWhereString($where);
$sql = "delete from ".$this->_table.$wheres;
//echo "[delete]".$sql."
";
$result = @mysql_query($sql);
if (! $result) {
return -1;
}
return @mysql_affected_rows();
}

protected function _getParamKeyString($params) {
$keys = array_keys($params);
return implode(",", $keys);
}

protected function _getParamValString($params) {
$vals = array_values($params);
return "'".implode("','", $vals)."'";
}

private function _getUpdateString($params) {
//echo "_getUpdateString";
$sql = "";
if (is_array($params)) {
$sql = $this->_getKeyValString($params, ",");
}
return $sql;
}

private function _getWhereString($params) {
//echo "_getWhereString";
$sql = "";
if (is_array($params)) {
$sql = " where ";
$where = $this->_getKeyValString($params, " and ");
$sql = $sql.$where;
}
return $sql;
}

private function _getKeyValString($params, $split) {
$str = "";
if (is_array($params)) {
$paramArr = array();
foreach($params as $key=>$val) {
$valstr = $val;
if (is_string($val)) {
$valstr = "'".$val."'";
}
$paramArr[] = $key."=".$valstr;
}
$str = $str.implode($split, $paramArr);
}
return $str;
}

public function release() {
@mysql_close();
}
}

function T($table) {
return (new SimpleDao())->table($table);
}
?>

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?php //require_once('FirePHPCore/FirePHP.class.php'); //$firephp = FirePHP::getInstance(true); // debugger in firefox class SimpleDao { private $_table =...