php数据库操作类(可用mysql,mssql,pg)

< ?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:[email protected] 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;

}

}

//********************************方法实现完毕****************************************//

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