php的mssql数据库连接类实例

2020-03-22 20:08:49

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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:复制代码代码如下:html' target='_blank'>class DB_Sql {
var $Host = "";
var $Database = "";
var $User = "";
var $Password = "";
var $Link_ID = 0;
var $Query_ID = 0;
var $Record = array();
var $Row = 0;

var $Errno = 0;
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(" br Debug: query = %s br ", $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[ key ]
$count = mssql_num_fields($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, 0, "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 b Database error: /b %s br ", $msg);
printf(" b MSSQL Error /b : %s (%s) br ",
$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。PHP教程

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