mssql+php数据库操作类

class DbQueryForMssql {
/**
* select方法返回的最大记录数
*/
const MAX_ROW_NUM = 100000;

/**
* 数据查询结果集对象
* @var object $dataSet
*/
public $dataSet = NULL ;

/**
* 数据源对象
* @var object $ds
*/
public $ds = NULL ;

/**
* 查询的SQL语句
* @var string $sql
*/
public $sql = '' ;

public $transCnt = 0;

/**
* 执行查询的模式，值为 OCI_COMMIT_ON_SUCCESS 或 OCI_DEFAULT
* @var string $excuteMode
*/
public $executeMode = OCI_COMMIT_ON_SUCCESS ;

/**
* 构造函数
* @param object $ds 数据库
* @param string $sql 要初始化查询的SQL语句
*/
function __construct($ds=NULL , $sql=NULL) {
if (!$ds) {
$this->error(DbException::DB_UNCONNECTED, '数据库还

未连接。');
} else {
$this->ds = $ds;
if ($sql) {
$this->open($sql);
}
}
}

/**
* 释放所占用的内存
* @param object $dataSet 需要释放资源的结果集
* @access public
*/
public function close($dataSet=NULL) {
if ($dataSet) {
@mssql_free_statement($dataSet);
} else {
@mssql_free_statement($this->dataSet);
$this->eof = false ;
$this->recordCount = 0 ;
$this->recNo = -1 ;
}
}
function __destruct()
{
@mssql_free_result($this->dataSet);
@mssql_free_statement($this->dataSet);
@mssql_close($this->ds->connect);
}
/**
* 对$pass进行数据库加密,返回加密之后的值
* @param string $pass 要加密的字符串
* @return string
* @access public
*/
public function encodePassword($pass) {
return md5($pass);
}

/**
* 得到错误信息和错误代号
* @param integer $queryResult 查询结果
* @return array
* @access protected
*/
protected function errorInfo($queryResult = NULL) {
$result['message'] = mssql_get_last_message();
@mssql_select_db($this->ds->name,$this->ds->connect);
/*if (_select_db($this->ds->name">!@mysql_select_db($this->ds->name)) {
throw new DbException('数据库不存在',

DbException::DB_OPEN_FAILED);
}*/
$id = @mssql_query("select @@ERROR", $this->ds->connect);
if (!$id) {
return false;
}
$arr = mssql_fetch_array($id);
@mssql_free_result($id);
if (is_array($arr)) {
$result['code'] = $arr[0];
} else {
return $result['code'] = -1;
}
return $result;
}

/**
* 错误信息处理
* @param string $errorId 错误ID
* @param string $errorMessage 错误信息
* @access protected
*/
protected function error($errorId, $errorMessage) {
throw new DbException($errorMessage, $errorId);
}

/**
* 执行SQL语句
* @param string $sql SQL语句
* @return object
* @param int $rowFrom 启始行号，行号从1开始
* @param int $rowTo 结束行号，值为0表示
* @access public
* @see DbQuery::open
*/
public function execute($sql = '', $rowFrom = 0, $rowTo =

self::MAX_ROW_NUM, $error = true) {
//echo $this->ds->name;
if ($rowTo != self::MAX_ROW_NUM) {
$nrows = $rowTo - $rowFrom + 1;
}
$offset = $rowFrom;
if ($nrows > 0) {
$nn = $nrows + $offset - 1;
$sql = preg_replace('/(^s*selects+

(distinctrow|distinct)?)/i', '\1 top ' . $nn . ' ', $sql);
}

@mssql_select_db($this->ds->name,$this->ds->connect);
/*if ()) {
throw new DbException('数据库不存在',

DbException::DB_OPEN_FAILED);
}*/
$dataSet = @mssql_query($sql, $this->ds->connect);
//echo $sql .'

';
if (!$dataSet && $error) {
$sqlError = $this->errorInfo();
$errorMessage = '执行[' .

$sql
. ']出错！

color=#FF0000> ['
. $sqlError['code'] . ']: '
. $sqlError['message'] . '' ;
$this->error(DbException::DB_QUERY_ERROR,

$errorMessage);
}

if ($offset) {
$offset = $offset-1;//var_dump($dataSet);echo 'abc';
$resultNum = mssql_num_rows($dataSet);
if ($resultNum<$offset) {
@mssql_data_seek($dataSet, $resultNum-1);
} else {
@mssql_data_seek($dataSet, $offset);
}
}
return $dataSet;
}

/**
* 执行SQL语句，结果集保存到属性$dataSet中
* @param string $sql SQL语句
* @param int $rowFrom 启始行号，行号从1开始
* @param int $rowTo 结束行号，值为0表示
* @return object
* @access public
* @see DbQuery::execute
*/
public function open($sql='', $rowFrom = 0, $rowTo =

self::MAX_ROW_NUM) {
$this->dataSet = $this->execute($sql, $rowFrom, $rowTo);
$this->sql = $sql ;
return $this->dataSet;
}

/**
* 将一行的各字段值拆分到一个数组中
* @param object $dataSet 结果集
* @param integer $resultType 返回类型，OCI_ASSOC、OCI_NUM 或

OCI_BOTH
* @return array
*/
public function fetchRecord($dataSet=NULL, $resultType=MSSQL_BOTH) {
$result = @mssql_fetch_array(($dataSet) ? $dataSet : $this-

>dataSet, $resultType);
if (is_array($result)) {
foreach ($result as $key => $value) {
if (!is_numeric($key)) {
$result[strtolower($key)] = $value;
}
}
}
return $result;
}

/**
* 取得字段数量
* @param object $dataSet 结果集
* @return integer
*/
public function getFieldCount($dataSet = NULL) {

return mssql_num_fields(($dataSet) ? $dataSet : $this-

>dataSet);
}

/**
* 取得下一条记录。返回记录号，如果到了记录尾，则返回FALSE
* @return integer
* @access public
* @see getPrior()
*/
public function next() {
return $this->fetchRecord();
}

/**
* 得到当前数据库时间，格式为：yyyy-mm-dd hh:mm:ss
* @return string
* @access public
*/
public function getNow() {
return $this->getValue('SELECT TO_CHAR(SYSDATE, 'YYYY-MM-DD

HH24:MI:SS') dateOfNow FROM DUAL');
}

/**
* 根据SQL语句从数据表中取数据，只取第一条记录的值，
* 如果记录中只有一个字段，则只返回字段值。
* 未找到返回 FALSE
*
* @param string $sql SQL语句
* @return array
* @access public
*/
public function getValue($sql = '',$dataFormat=MSSQL_BOTH) {
$dataSet = $this->execute($sql, 1, 1);

if ($result = $this->fetchRecord($dataSet,$dataFormat)) {
$fieldCount = $this->getFieldCount($dataSet);
$idx = 0;
if($dataFormat == MSSQL_ASSOC){//如果使用

MSSQL_ASSOC,且只有一列时,则需要知道第一列的列名.
$firstColumnInfo = mssql_fetch_field

($dataSet ,0 );
$idx = $firstColumnInfo->name;//column name
}
$this->close($dataSet);//print_r($result);
return ($fieldCount<=1) ? $result[$idx] : $result;
} else {
return false ;
}
}

/**
* 取ID自递增值
*
* @return int
* @access public
*/
public function getInsertId() {
return $this->getValue('select @@identity');
}

/**
* 取序列
* @param $seq 序列名
* @return int
* @access public
*/
public function getSeq($seq = '') {
$this->execute('BEGIN TRANSACTION adodbseq');
$ok = $this->execute("update $seq with (tablock,holdlock)

set id = id + 1", 0, self::MAX_ROW_NUM, false);
if (!$ok) {
$this->execute("create table $seq (id float(53))");
$ok = $this->execute("insert into $seq with

(tablock,holdlock) values(1)", 0, self::MAX_ROW_NUM, false);
if (!$ok) {
$this->execute('ROLLBACK TRANSACTION

adodbseq');
return false;
}
$this->execute('COMMIT TRANSACTION adodbseq');
return 1;
}
$num = $this->getValue("select id from $seq");
$this->execute('COMMIT TRANSACTION adodbseq');
return $num;
}
/**
* 表是否存在，返回true
* @param string $tableName 要查询的表名
* @return bool
* @access public
*/
public function tableIsExists($tableName) {
return false;
}

/**
* 开始事务
* @access public
*/
public function begin() {
$this->transCnt += 1;
$this->execute('BEGIN TRAN');
return true;
}

/**
* 提交事务
* @access public
*/
public function commit() {
if ($this->transCnt) {
$this->transCnt -= 1;
}
$this->execute('COMMIT TRAN');
return true;
}

/**
* 回滚事务
* @access public
*/
public function rollback() {
if ($this->transCnt){
$this->transCnt -= 1;
}
$this->execute('ROLLBACK TRAN');
return true;
}

/**
* 插入一条记录
* @param string $tableName 表名
* @param array $fieldArray 字段数组
* @param string $whereForUnique 唯一性条件
* @return int
* @access public
*/
public function insert($tableName, $fieldArray, $whereForUnique =

NULL) {
if (!$tableName || !$fieldArray || !is_array($fieldArray)) {
throw new Exception('参数 $tableName 或 $fieldArray

的值不合法！');
}
if ($whereForUnique) {
$where = ' WHERE ' . $whereForUnique;
$isExisted = $this->getValue('SELECT COUNT(*) FROM '

. $tableName . $where);
if ($isExisted) {
throw new DbException('记录已经存在！',

DbException::DB_RECORD_IS_EXISTED);
}
}
$fieldNameList = array();
$fieldValueList = array();
foreach ($fieldArray as $fieldName => $fieldValue) {
if (!is_int($fieldName)) {
$fieldNameList[] = $fieldName;
$fieldValueList[] = ''' . $fieldValue .

''';
}
}
$fieldName = implode(',', $fieldNameList);
$fieldValue = implode(',', $fieldValueList);
$sql = 'INSERT INTO ' . $tableName . '('
. $fieldName . ') VALUES (' .

$fieldValue . ')';
//return $sql;
return $this->execute($sql);
}

/**
* 更新一条记录
* @param string $tableName 表名
* @param array $fieldArray 字段数组
* @param string $whereForUpdate 查询条件
* @param string $whereForUnique 唯一性条件
* @return int
* @access public
*/
public function update($tableName, $fieldArray,

$whereForUpdate=NULL, $whereForUnique=NULL) {
if (!$tableName || !$fieldArray || !is_array($fieldArray)) {
throw new Exception('参数 $tableName 或 $fieldArray

的值不合法！');
}
if ($whereForUnique) {
$where = ' WHERE ' . $whereForUnique;
$isExisted = $this->getValue('SELECT COUNT(*) FROM '

. $tableName . $where);
if ($isExisted) {
throw new DbException('记录已经存在！',

DbException::DB_RECORD_IS_EXISTED);
}
}
$fieldNameValueList = array();
foreach ($fieldArray as $fieldName => $fieldValue) {
if (!is_int($fieldName)) {
$fieldNameValueList[] = $fieldName . '='' .

$fieldValue . ''';
}
}
$fieldNameValue = implode(',', $fieldNameValueList);
if ($whereForUpdate) {
$whereForUpdate = ' WHERE ' . $whereForUpdate;
}
$sql = 'UPDATE ' . $tableName
. ' SET ' . $fieldNameValue .

$whereForUpdate;
return $this->execute($sql);
//return $sql;
}

/**
* 选择一条记录
* @param string $sql sql语句
* @param string $dataFormat 返回数据格式, 值

有"array","hashmap","hashmap_str","dataset"
* @param int $rowFrom 启始行号，行号从1开始
* @param int $rowTo 结束行号，值为0表示
* @result array
* @access public
*/
public function select($sql, $dataFormat = 'array', $rowFrom = 0,

$rowTo = self::MAX_ROW_NUM) {
$dataSet = $this->execute($sql, $rowFrom, $rowTo);
switch ($dataFormat) {
case 'array': //数组
$result = array();
$isMultiField = ($this->getFieldCount($dataSet) >

1);
$i = 0;
while ($data = $this->fetchRecord($dataSet)) {
$result[$i] = ($isMultiField) ? $data :

$data[0];
$i++;
}
$this->close($dataSet);
break;

case 'arrayassoc': //数组,有BUG,这里面需要用列名为索引!当只

有一列有时候
$result = array();
$isMultiField = ($this->getFieldCount($dataSet) >

1);
$i = 0;
while ($data = $this->fetchRecord

($dataSet,MSSQL_ASSOC)) {
$idx = 0;
if(!$isMultiField){//只有一列的话
if($dataFormat == MSSQL_ASSOC){//用

MSSQL_ASSOC,且只有一列时,则需要知道第一列的列名.
$firstColumnInfo = mssql_fetch_field

($dataSet ,0 );
$idx = $firstColumnInfo-

>name;//column name
}
}
$result[$i] = ($isMultiField) ? $data :

$data[$idx];
$i++;
}
$this->close($dataSet);
break;

case 'hashmap': //散列表
$result = array();
while ($data = $this->fetchRecord($dataSet)) {
$result[ $data[0] ] = $data[1];
}
$this->close($dataSet);
break;

case 'hashmap_str': //散列表字符串
$result = array();
while ($data = $this->fetchRecord($dataSet,

OCI_NUM)) {
$result[] = $data[0] . '=' . $data[1];
}
$result = implode('|', $result);
$this->close($dataSet);
break;

default: //dataset 数据集，当返回数据格式为数据集时，select

方法的功能与execute方法相同
$result = $dataSet;
}
return $result;
}

/**
* 返回最大值
* @param string $tableName 表名
* @param string $idField 字段名
* @param string $where 查询条件
* @return int
* @access public
*/
public function getMax($tableName, $idField, $where = NULL) {
$where = ($where) ? (' WHERE ' . $where) : '';
return $this->getValue('SELECT MAX(' . $idField . ') FROM '

. $tableName . $where);
}
}