[转]php通用连接数据库类
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;
}
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