本文实例讲述了PHP的mssql数据库连接类实例代码,分享给大家供大家参考。
具体实现代码如下:
var $Error = "";
var $Auto_Free = 0; ## set this to 1 to automatically free results
function DB_Sql($query = "") {
$this->query($query);
}
function connect() {
if ( 0 == $this->Link_ID ) {
$this->Link_ID=mssql_connect($this->Host,$this->User,$this->Password);
if (!$this->Link_ID)
$this->halt("Link-ID == false,mssql_pconnect Failed");
else
@mssql_select_db($this->Database,$this->Link_ID);
}
}
function free_result(){
mssql_free_result($this->Query_ID);
$this->Query_ID = 0;
}
function query($Query_String)
{
/ No empty queries,please,since PHP4 chokes on them. /
if ($Query_String == "")
/* The empty query string is passed on from the constructor,
- when calling the class without a query,e.g. in situations
- like these: '$db = new DB_sql_Subclass;'
*/
return 0;
if (!$this->Link_ID)
$this->connect();
printf("
Debug: query = %s
",$Query_String);
$this->Query_ID = mssql_query($Query_String,$this->Link_ID);
$this->Row = 0;
if (!$this->Query_ID) {
$this->Errno = 1;
$this->Error = "General Error (The MSsql interface cannot return detailed error messages).";
$this->halt("Invalid sql: ".$Query_String);
}
return $this->Query_ID;
}
function next_record() {
if ($this->Record = mssql_fetch_row($this->Query_ID)) {
// add to Record[
$count = mssql_num_fields($this->Query_ID);
for ($i=0; $i<$count; $i++){
$fieldinfo = mssql_fetch_field($this->Query_ID,$i);
$this->Record[strtolower($fieldinfo->name)] = $this->Record[$i];
}
$this->Row += 1;
$stat = 1;
} else {
if ($this->Auto_Free) {
$this->free_result();
}
$stat = 0;
}
return $stat;
}
function seek($pos) {
mssql_data_seek($this->Query_ID,$pos);
$this->Row = $pos;
}
function Metadata($table) {
$count = 0;
$id = 0;
$res = array();
$this->connect();
$id = mssql_query("select * from $table",$this->Link_ID);
if (!$id) {
$this->Errno = 1;
$this->Error = "General Error (The MSsql interface cannot return detailed error messages).";
$this->halt("Metadata query Failed.");
}
$count = mssql_num_fields($id);
for ($i=0; $i<$count; $i++) {
$info = mssql_fetch_field($id,$i);
$res[$i]["table"] = $table;
$res[$i]["name"] = $info["name"];
$res[$i]["len"] = $info["max_length"];
$res[$i]["flags"] = $info["numeric"];
}
$this->free_result();
return $res;
}
function affected_rows() {
// Not a supported function in PHP3/4. Chris Johnson,16May2001.
// return mssql_affected_rows($this->Query_ID);
$rsRows = mssql_query("Select @@rowcount as rows",$this->Link_ID);
if ($rsRows) {
return mssql_result($rsRows,"rows");
}
}
function num_rows() {
return mssql_num_rows($this->Query_ID);
}
function num_fields() {
return mssql_num_fields($this->Query_ID);
}
function nf() {
return $this->num_rows();
}
function np() {
print $this->num_rows();
}
function f($Field_Name) {
return $this->Record[strtolower($Field_Name)];
}
function p($Field_Name) {
print $this->f($Field_Name);
}
function halt($msg) {
printf("</td></tr></table>Database error: %s
",$msg);
printf("MSsql Error: %s (%s)
",
$this->Errno,
$this->Error);
die("Session halted.");
}
}
希望本文所述对大家的PHP程序设计有所帮助。