php通用连接数据库类

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<?PHP
/**********************************************************************************
            此类将数据库操作封装，具有良好的可移植性,针对数据库：mysql,mssql,pg
*原作者：Andrzej Manczyk 整理：玉面修罗 E-mail/msn:xiuluo-999@163.com 时间：2006-12-20*
************************************************************************************
// -函数清单                                                    索引：
// - Open:                   打开数据库连接                                    Line:71
// - Close:                   关闭数据库连接                                      Line:107
// - SelectDB:               选择数据库                                          Line:129
// - Query:                   创建查询                                             Line:151
// - DataSeek:              移动记录指针                                        Line:175
// - FieldName:              获取字段名称                                       Line:198
// - FieldType:               获取字段类型                                       Line:220
// - FieldLenght:             获取字段长度                                       Line:242
// - FetchRow:               获取数据并保存到数组（数字索引）        Line:264
// - FetchArray:              获取数据并保存进数组（数字和关联）      Line:289
// - FetchObject:            获取数据并保存到对象（对象方式）        Line:315
// - Result:                     获取结果数据                                      Line:341
// - FreeResult:               刷新记录集                                         Line:363
// - RowsNumber:            获取记录数量                                     Line:385
// - FieldsNumber:            获取字段数量                                     Line:407
// - CurRecNumber:          获取当前记录号（从0开始）                 Line:429
// - RecordNumber:          获取当前行号（从1开始）                     Line:438
// - MoveFirstRec:            移动到第一条记录                               Line:447
// - MoveLastRec:            移动到最后一条记录                            Line:469
// - MovePreviousRec:       移动到前一条记录                              Line:495
// - MoveNextRec:           移动到下一条记录                               Line:521
// - MoveToRec:              移动到一个特定的记录（从1开始）         Line:548
************************************************************************************
//Inputs:
// - dbType: databases type: mssql, mysql, pg
// - connectType: connection type: c - common connection,
//                                 p - open persistent connection
// - connect: for MS SQL Server - server name,
//            for MySQL - hostname [:port] [:/path/to/socket] ,
//            for PostgreSQL - host, port, tty, options,
//                             dbname (without username and password)
// - username
// - password
// - dbName: database name
// - query: SQL query
// - result: result set identifier
// - RowNumber:
// - offset: field identifier
// - ResultType: a constant and can take the following values: PGSQL_ASSOC, PGSQL_NUM, and   PGSQL_BOTH
// - FieldName
//
//Returns:
// - result: result set identifier
// - connect link identifier
// - record number (starting at 0: CurrRecNumber or starting at 1: RecordNumber)
// - number of fields in the specified result set
// - number of rows in the specified result set
*************************************************************************************/
Class mDatabase
{
/***********************************成员变量定义***************************************/
var $dbType;          // 数据库类型: mssql, mysql, pg
var $connectType;     // 连接类型: c - common connection, p - open persistent connection
var $idCon;           // 连接号
var $curRow;          // current row number of data from the result
                      // associated with the specified result identifier array
var $seek;            // current row number of data from DataSeek function array

/***********************************成员方法实现***************************************/
/************************************************************************************
*连接数据库的函数
*************************************************************************************/
Function Open($dbType, $c, $connect, $username = "", $password = "")
{
$this->dbType = $dbType;
Switch ($dbType) {
Case "mssql":
   If ($connectType == "c") {
    $idCon = mssql_connect($connect, $username, $password);
   } Else {
    $idCon = mssql_pconnect($connect, $username, $password);
   }
   Break;
Case "mysql":
   If ($connectType == "c") {
    $idCon = mysql_connect($connect, $username, $password);
   } Else {
    $idCon = mysql_pconnect($connect, $username, $password);
   }
   Break;
Case "pg":
   If ($connectType == "c") {
    $idCon = pg_connect($connect . " user=" . $username . " password=" . $password);
   } Else {
    $idCon = pg_pconnect($connect . " user=" . $username . " password=" . $password);
   }
   Break;
Default:
   $idCon = 0;
   Break;
}
$this->idCon = $idCon;
Return $idCon;
}
/************************************************************************************
*关闭数据库连接
*************************************************************************************/
Function Close()
{
Switch ($this->dbType) {
Case "mssql":
   $r = mssql_close($this->idCon);
   Break;
Case "mysql":
   $r = mysql_close($this->idCon);
   Break;
Case "pg":
   $r = pg_close($this->idCon);
   Break;
Default:
   $r = False;
   Break;
}
Return $r;
}
/************************************************************************************
*选择数据库
*************************************************************************************/
Function SelectDb($dbName)
{
Switch ($this->dbType) {
Case "mssql":
   $r = mssql_select_db($dbName);
   Break;
Case "mysql":
   $r = mysql_select_db($dbName);
   Break;
Case "pg":
   $r = False;
   Break;
Default:
   $r = False;
   Break;
}
Return $r;
}
/************************************************************************************
*创建查询
*************************************************************************************/
Function Query($query)
{
Switch ($this->dbType) {
Case "mssql":
   $r = mssql_query($query, $this->idCon);
   Break;
Case "mysql":
   $r = mysql_query($query, $this->idCon);
   Break;
Case "pg":
   $r = pg_exec($this->idCon, $query);
   Break;
Default:
   $r = False;
   Break;
}
$this->curRow[$r] = 0;
$this->seek[$r] = 0;
Return $r;
}
/************************************************************************************
*移动记录指针
*************************************************************************************/
Function DataSeek($result, $RowNumber)
{
Switch ($this->dbType) {
Case "mssql":
   $r = mssql_data_seek($result, $RowNumber);
   Break;
Case "mysql":
   $r = mysql_data_seek($result, $RowNumber);
   Break;
Case "pg":
   $r = False;
   Break;
Default:
   $r = False;
   Break;
}
$this->seek[$result] = (int) $RowNumber;
Return $r;
}
/************************************************************************************
*获取字段名
*************************************************************************************/
Function FieldName($result, $offset)
{
Switch ($this->dbType) {
Case "mssql":
   $r = mssql_field_name($result, $offset);
   Break;
Case "mysql":
   $r = mysql_field_name($result, $offset);
   Break;
Case "pg":
   $r = pg_fieldname($result, $offset);
   Break;
Default:
   $r = False;
   Break;
}
Return $r;
}
/************************************************************************************
*获取字段类型
*************************************************************************************/
Function FieldType($result, $offset)
{
Switch ($this->dbType) {
Case "mssql":
   $r = mssql_field_type($result, $offset);
   Break;
Case "mysql":
   $r = mysql_field_type($result, $offset);
   Break;
Case "pg":
   $r = pg_fieldtype($result, $offset);
   Break;
Default:
   $r = False;
   Break;
}
Return $r;
}
/************************************************************************************
*获取字段长度
*************************************************************************************/
Function FieldLength($result, $offset)
{
Switch ($this->dbType) {
Case "mssql":
   $r = mssql_field_length($result, $offset);
   Break;
Case "mysql":
   $r = mysql_field_len($result, $offset);
   Break;
Case "pg":
   $r = pg_fieldsize($result, $offset);
   Break;
Default:
   $r = False;
   Break;
}
Return $r;
}
/************************************************************************************
*获取数据并保存到数组，可以用数字索引方式访问数组
*************************************************************************************/
Function FetchRow($result, $RowNumber = 0)
{
Switch ($this->dbType) {
Case "mssql":
   $r = mssql_fetch_row($result);
   Break;
Case "mysql":
   $r = mysql_fetch_row($result);
   Break;
Case "pg":
   $r = pg_fetch_row($result, $RowNumber);
   If ($r) {
    $this->curRow[$result] = $RowNumber;
    $this->seek[$result] = $RowNumber;
   }
   Break;
Default:
   $r = False;
   Break;
}
Return $r;
}

/************************************************************************************
*获取数据并保存到数组，可以用数字索引和关联索引的方式访问
*************************************************************************************/
Function FetchArray($result, $RowNumber = 0, $ResultType = 2)
{
Switch ($this->dbType) {
Case "mssql":
   $r = mssql_fetch_array($result);
   Break;
Case "mysql":
   $r = mysql_fetch_array($result);
   Break;
Case "pg":
   $r = pg_fetch_array($result, $RowNumber, $ResultType);
   If ($r) {
    $this->curRow[$result] = $RowNumber;
    $this->seek[$result] = $RowNumber;
   }
   Break;
Default:
   $r = False;
   Break;
}
Return $r;
}
/************************************************************************************
*获取数据并保存到对象
*************************************************************************************/
Function FetchObject($result, $RowNumber = 0, $ResultType = 2)
{
Switch ($this->dbType) {
Case "mssql":
   $r = mssql_fetch_object($result);
   Break;
Case "mysql":
   $r = mysql_fetch_object($result);
   Break;
Case "pg":
   $r = pg_fetch_object($result, $RowNumber, $ResultType);
   If ($r) {
    $this->curRow[$result] = $RowNumber;
    $this->seek[$result] = $RowNumber;
   }
   Break;
Default:
   $r = False;
   Break;
}
Return $r;
}
/************************************************************************************
*获取结果数据
*************************************************************************************/
Function Result($result, $RowNumber, $FieldName)
{
Switch ($this->dbType) {
Case "mssql":
   $r = mssql_result($result, $RowNumber, $FieldName);
   Break;
Case "mysql":
   $r = mysql_result($result, $RowNumber, $FieldName);
   Break;
Case "pg":
   $r = pg_result($result, $RowNumber, $FieldName);
   Break;
Default:
   $r = False;
   Break;
}
Return $r;
}
/************************************************************************************
*释放结果数据
*************************************************************************************/
Function FreeResult($result)
{
Switch ($this->dbType) {
Case "mssql":
   $r = mssql_free_result($result);
   Break;
Case "mysql":
   $r = mysql_free_result($result);
   Break;
Case "pg":
   $r = pg_freeresult($result);
   Break;
Default:
   $r = False;
   Break;
}
Return $r;
}
/************************************************************************************
*获取记录数量
*************************************************************************************/
Function RowsNumber($result)
{
Switch ($this->dbType) {
Case "mssql":
   $r = mssql_num_rows($result);
   Break;
Case "mysql":
   $r = mysql_num_rows($result);
   Break;
Case "pg":
   $r = pg_numrows($result);
   Break;
Default:
   $r = False;
   Break;
}
Return $r;
}
/************************************************************************************
*获取字段数量
*************************************************************************************/
Function FieldsNumber($result)
{
Switch ($this->dbType) {
Case "mssql":
   $r = mssql_num_fields($result);
   Break;
Case "mysql":
   $r = mysql_num_fields($result);
   Break;
Case "pg":
   $r = pg_numfields($result);
   Break;
Default:
   $r = False;
   Break;
}
Return $r;
}
/************************************************************************************
*获取当前记录号（从0开始）
*************************************************************************************/
Function CurRecNumber($result)
{
$r = $this->curRow[$result];
Return $r;
}
/************************************************************************************
*获取当前行号（从1开始）
*************************************************************************************/
Function RecordNumber($result)
{
$cr = $this->CurRecNumber($result) + 1;
Return $cr;
}
/************************************************************************************
*移动到第一条记录
*************************************************************************************/
Function MoveFirstRec($result)
{
Switch ($this->dbType) {
Case "pg":
   $r = $this->FetchRow($result, 0);
   Break;
Default:
   $rn = $this->DataSeek($result, 0);
   If ($rn) {
    $r = $this->FetchRow($result);
    If ($r) $this->curRow[$result] = $this->seek[$result];
   } Else {
    $r = False;
   }
   Break;
}
Return $r;
}
/************************************************************************************
*移动到最后一条记录
*************************************************************************************/
Function MoveLastRec($result)
{
$rs = $this->RowsNumber($result);
If ($rs) {
$rs--;
Switch ($this->dbType) {
   Case "pg":
    $r = $this->FetchRow($result, $rs);
    Break;
   Default:
    $rn = $this->DataSeek($result, $rs);
    If ($rn) {
     $r = $this->FetchRow($result);
     If ($r) $this->curRow[$result] = $this->seek[$result];
    } Else {
     $r = False;
    }
    Break;
}
}
Return $r;
}
/************************************************************************************
*移动到前一条记录
*************************************************************************************/
Function MovePreviousRec($result)
{
$rs = $this->CurRecNumber($result);
If ($rs) {
$rs--;
Switch ($this->dbType) {
   Case "pg":
    $r = $this->FetchRow($result, $rs);
    Break;
   Default:
    $rn = $this->DataSeek($result, $rs);
    If ($rn) {
     $r = $this->FetchRow($result);
     If ($r) $this->curRow[$result] = $this->seek[$result];
    } Else {
     $r = False;
    }
    Break;
}
}
Return $r;
}
/************************************************************************************
*移动到下一条记录
*************************************************************************************/
Function MoveNextRec($result)
{
$rs = $this->CurRecNumber($result);
$rn = $this->RowsNumber($result);
$rs++;
If ($rs != $rn) {
Switch ($this->dbType) {
   Case "pg":
    $r = $this->FetchRow($result, $rs);
    Break;
   Default:
    $re = $this->FetchRow($result);
    If ($re) {
     $r = $re;
     $this->curRow[$result]++;
     $this->seek[$result] = $this->curRow[$result];
    } Else {
     $r = False;
    }
    Break;
}
}
Return $r;
}
/************************************************************************************
*移动到指定记录（编号从0开始）
*************************************************************************************/
Function MoveToRec($result, $RowNumber)
{
$rn = $this->RowsNumber($result);
If ($RowNumber > 0 And $RowNumber < $rn) {
$RowNumber--;
Switch ($this->dbType) {
   Case "pg":
    $r = $this->FetchRow($result, $RowNumber);
    Break;
   Default:
    $rn = $this->DataSeek($result, $RowNumber);
    If ($rn) {
     $r = $this->FetchRow($result);
     If ($r) $this->curRow[$result] = $this->seek[$result];
    } Else {
     $r = False;
    }
    Break;
}
}
Return $r;
}
}
//********************************方法实现完***************************************//
?>