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。