php实现可用于mysql,mssql,pg数据库操作类

本文实例讲述了可用mysql,mssql,pg三种数据库的数据库操作类,你只要作任何修改就可以方便的改变你数据库的类型.分享给大家供大家参考。具体分析如下：

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

php数据库操作类代码如下:

<?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 

************************************************************************************ 

// -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****************************************// 

?>

希望本文所述对大家的PHP数据库程序设计有所帮助。