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:71Close:关闭数据库连接 Line:107SelectDB:选择数据库 Line:129Query:创建查询 Line:151DataSeek:移动记录指针 Line:175FieldName:获取字段名称 Line:198FieldType:获取字段类型 Line:220FieldLenght:获取字段长度 Line:242FetchRow:获取数据并保存到数组（数字索引） Line:264FetchArray:获取数据并保存进数组（数字和关联） Line:289FetchObject:获取数据并保存到对象（对象方式） Line:315Result:获取结果数据 Line:341FreeResult:刷新记录集 Line:363RowsNumber:获取记录数量 Line:385FieldsNumber:获取字段数量 Line:407CurRecNumber:获取当前记录号（从0开始） Line:429RecordNumber:获取当前行号（从1开始） Line:438MoveFirstRec:移动到第一条记录 Line:447MoveLastRec:移动到最后一条记录 Line:469MovePreviousRec:移动到前一条记录 Line:495MoveNextRec:移动到下一条记录 Line:521MoveToRec: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:复制代码 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。