在PHPLIB中的MYSQL类中加INSERT,UPDATE,DELETE等函数

起原：kingerq的 Blog 作者：kingerq的 Blog

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<?php
/*
* Session Management for PHP3
*
* Copyright (c) 1998-2000 NetUSE AG
* Boris Erdmann, Kristian Koehntopp
*
*  $Id: db_mysql.inc,v 1.2 2000/07/12 18:22:34 kk Exp  $
*
*/

>
/* public: connection parameters */
var  $Host = "";
var  $Database = "";
var  $User = "";
var  $Password = "";

/* public: configuration parameters */
var  $Auto_Free = 0; ## Set to 1 for automatic mysql_free_result()
var  $Debug = 0; ## Set to 1 for debugging messages.
var  $Halt_On_Error = "yes"; ## "yes" (halt with message), "no" (ignore errors quietly), "report" (ignore errror, but spit a warning)
var  $Seq_Table = "db_sequence";

/* public: result array and current row number */
var  $Record = array();
var  $Row;

/* public: current error number and error text */
var  $Errno = 0;
var  $Error = "";

/* public: this is an api revision, not a CVS revision. */
var  $type = "mysql";
var  $revision = "1.2";

/* private: link and query handles */
var  $Link_ID = 0;
var  $Query_ID = 0;

var  $sql = "";

/* public: constructor */
function DB_Sql( $query = "") {
 $this->query( $query);
}

/* public: some trivial reporting */
function link_id() {
return  $this->Link_ID;
}

function query_id() {
return  $this->Query_ID;
}

/* public: connection management */
function connect( $Database = "",  $Host = "",  $User = "",  $Password = "") {
/* Handle defaults */
if ("" ==  $Database)
 $Database =  $this->Database;
if ("" ==  $Host)
 $Host =  $this->Host;
if ("" ==  $User)
 $User =  $this->User;
if ("" ==  $Password)
 $Password =  $this->Password;

/* establish connection, select database */
if ( 0 ==  $this->Link_ID ) {

 $this->Link_ID=mysql_pconnect( $Host,  $User,  $Password);
if (! $this->Link_ID) {
 $this->halt("pconnect( $Host,  $User,  $Password) failed.");
return 0;
}

if (!@mysql_select_db( $Database, $this->Link_ID)) {
 $this->halt("cannot use database ". $this->Database);
return 0;
}
}

return  $this->Link_ID;
}

/* public: discard the query result */
function free() {
@mysql_free_result( $this->Query_ID);
 $this->Query_ID = 0;
}

/* public: perform a query */
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 > * like these: '''' $db = new DB_Sql_Sub> */
return 0;

if (! $this->connect()) {
return 0; /* we already complained in connect() about that. */
};

# New query, discard previous result.
if ( $this->Query_ID) {
 $this->free();
}

if ( $this->Debug)
printf("Debug: query = %s<br>n",  $Query_String);

 $this->Query_ID = @mysql_query( $Query_String, $this->Link_ID);
 $this->Row = 0;
 $this->Errno = mysql_errno();
 $this->Error = mysql_error();
if (! $this->Query_ID) {
 $this->halt("Invalid SQL: ". $Query_String);
}

# Will return nada if it fails. That''''s fine.
return  $this->Query_ID;
}

/* public: walk result set */
function next_record() {
if (! $this->Query_ID) {
 $this->halt("next_record called with no query pending.");
return 0;
}

 $this->Record = @mysql_fetch_array( $this->Query_ID);
 $this->Row = 1;
 $this->Errno = mysql_errno();
 $this->Error = mysql_error();

 $stat = is_array( $this->Record);
if (! $stat &&  $this->Auto_Free) {
 $this->free();
}
return  $stat;
}

/* public: insert record */
function insert(  $table,  $data) {
if ( is_array(  $data ) ) {
 $this->sql = "INSERT INTO  $table ( `".implode( "` , `" , array_keys( $data) )."` )
VALUES ( ''''".implode( "'''' , ''''", array_values( $data) )."'''' )";
} else {
die("<strong>Error</strong> : Data Empty! ");
}
return  $this->query(  $this->sql );
}

/* public: delete record */
function delete(  $table,  $where = "",  $limit = 0 ) {
 $this->sql = "DELETE FROM  $table ";
 $this->sql .=  $this->where( $where);
 $this->sql .= intval( $limit) ? " LIMIT ". intval( $limit) : "";
return  $this->query(  $this->sql );
}

/* public: update record */
function update(  $table,  $update = "",  $where = "",  $limit = 0 ) {
 $setword = "";
if( is_array(  $update ) ) {
while ( list(  $field,  $value ) = each( $update) ) {
 $setword .=  $setword ? " , " : "";
 $setword .= "` $field` = ''''". $value."''''";
}
}else {
 $setword =  $update;
}

 $this->sql = "UPDATE  $table SET  $setword ";
 $this->sql .=  $this->where( $where);
 $this->sql .= intval( $limit) ? " LIMIT ". intval( $limit) : "";
return  $this->query(  $this->sql );
}

/* public: count record */
function recordcount(  $table,  $where = "" ) {
 $this->sql = "SELECT COUNT(*) FROM  $table " .  $this->where( $where);
 $this->query(  $this->sql );
if(  $this->next_record() ) {
return  $this->f(0);
}else {
return 0;
}
}

/* public: select record */
function select(  $table,  $fields = "*",  $where = "",  $order = "",  $group = "",  $limit = 10 ) {

}

/* public: set where */
function where(  $where ) {
 $condition = "";
if( is_array(  $where ) ) {
foreach(  $where as  $key =>  $val ){
if( preg_match( "/^d* $/",  $key ) ) {//or
foreach(  $val as  $k =>  $v ) {
 $condition .=  $condition
? " OR ( ` $k` = ''''".implode( "'''' AND ` $k` = ''''",  $v )."'''' )"
: " WHERE ( ` $k` = ''''".implode( "'''' AND ` $k` = ''''",  $v )."'''')";
}
}else {//and
 $condition .=  $condition
? " AND ( ` $key` = ''''".implode( "'''' OR ` $key` = ''''",  $val )."'''')"
: " WHERE ( ` $key` = ''''".implode( "'''' OR ` $key` = ''''",  $val )."'''')";
}
}
}else {
 $condition .= " ". $where;
}
return  $condition;
}

/* public: show sql */
function showsql() {
return  $this->sql;
}

/* public: position in result set */
function seek( $pos = 0) {
 $status = @mysql_data_seek( $this->Query_ID,  $pos);
if ( $status)
 $this->Row =  $pos;
else {
 $this->halt("seek( $pos) failed: result has ". $this->num_rows()." rows");

/* half assed attempt to save the day,
* but do not consider this documented or even
* desireable behaviour.
*/
@mysql_data_seek( $this->Query_ID,  $this->num_rows());
 $this->Row =  $this->num_rows;
return 0;
}

return 1;
}

/* public: table locking */
function lock( $table,  $mode="write") {
 $this->connect();

 $query="lock tables ";
if (is_array( $table)) {
while (list( $key, $value)=each( $table)) {
if ( $key=="read" &&  $key!=0) {
 $query.=" $value read, ";
} else {
 $query.=" $value  $mode, ";
}
}
 $query=substr( $query,0,-2);
} else {
 $query.=" $table  $mode";
}
 $res = @mysql_query( $query,  $this->Link_ID);
if (! $res) {
 $this->halt("lock( $table,  $mode) failed.");
return 0;
}
return  $res;
}

function unlock() {
 $this->connect();

 $res = @mysql_query("unlock tables");
if (! $res) {
 $this->halt("unlock() failed.");
return 0;
}
return  $res;
}

/* public: evaluate the result (size, width) */
function affected_rows() {
return @mysql_affected_rows( $this->Link_ID);
}

function num_rows() {
return @mysql_num_rows( $this->Query_ID);
}

function num_fields() {
return @mysql_num_fields( $this->Query_ID);
}

/* public: shorthand notation */
function nf() {
return  $this->num_rows();
}

function np() {
print  $this->num_rows();
}

function f( $Name) {
return  $this->Record[ $Name];
}

function p( $Name) {
print  $this->Record[ $Name];
}

/* public: sequence numbers */
function nextid( $seq_name) {
 $this->connect();

if ( $this->lock( $this->Seq_Table)) {
/* get sequence number (locked) and increment */
 $q = sprintf("select nextid from %s where seq_name = ''''%s''''",
 $this->Seq_Table,
 $seq_name);
 $id = @mysql_query( $q,  $this->Link_ID);
 $res = @mysql_fetch_array( $id);

/* No current value, make one */
if (!is_array( $res)) {
 $currentid = 0;
 $q = sprintf("insert into %s values(''''%s'''', %s)",
 $this->Seq_Table,
 $seq_name,
 $currentid);
 $id = @mysql_query( $q,  $this->Link_ID);
} else {
 $currentid =  $res["nextid"];
}
 $nextid =  $currentid 1;
 $q = sprintf("update %s set nextid = ''''%s'''' where seq_name = ''''%s''''",
 $this->Seq_Table,
 $nextid,
 $seq_name);
 $id = @mysql_query( $q,  $this->Link_ID);
 $this->unlock();
} else {
 $this->halt("cannot lock ". $this->Seq_Table." - has it been created?");
return 0;
}
return  $nextid;
}

/* public: return table metadata */
function metadata( $table='''''''', $full=false) {
 $count = 0;
 $id = 0;
 $res = array();

/*
* Due to compatibility problems with Table we changed the behavior
* of metadata();
* depending on  $full, metadata returns the following values:
*
* - full is false (default):
*  $result[]:
* [0]["table"] table name
* [0]["name"] field name
* [0]["type"] field type
* [0]["len"] field length
* [0]["flags"] field flags
*
* - full is true
*  $result[]:
* ["num_fields"] number of metadata records
* [0]["table"] table name
* [0]["name"] field name
* [0]["type"] field type
* [0]["len"] field length
* [0]["flags"] field flags
* ["meta"][field name] index of field named "field name"
* The last one is used, if you have a field name, but no index.
* Test: if (isset( $result[''''meta''''][''''myfield''''])) { ...
*/

// if no  $table specified, assume that we are working with a query
// result
if ( $table) {
 $this->connect();
 $id = @mysql_list_fields( $this->Database,  $table);
if (! $id)
 $this->halt("Metadata query failed.");
} else {
 $id =  $this->Query_ID;
if (! $id)
 $this->halt("No query specified.");
}

 $count = @mysql_num_fields( $id);

// made this IF due to performance (one if is faster than  $count if''''s)
if (! $full) {
for ( $i=0;  $i< $count;  $i ) {
 $res[ $i]["table"] = @mysql_field_table ( $id,  $i);
 $res[ $i]["name"] = @mysql_field_name ( $id,  $i);
 $res[ $i]["type"] = @mysql_field_type ( $id,  $i);
 $res[ $i]["len"] = @mysql_field_len ( $id,  $i);
 $res[ $i]["flags"] = @mysql_field_flags ( $id,  $i);
}
} else { // full
 $res["num_fields"]=  $count;

for ( $i=0;  $i< $count;  $i ) {
 $res[ $i]["table"] = @mysql_field_table ( $id,  $i);
 $res[ $i]["name"] = @mysql_field_name ( $id,  $i);
 $res[ $i]["type"] = @mysql_field_type ( $id,  $i);
 $res[ $i]["len"] = @mysql_field_len ( $id,  $i);
 $res[ $i]["flags"] = @mysql_field_flags ( $id,  $i);
 $res["meta"][ $res[ $i]["name"]] =  $i;
}
}

// free the result only if we were called on a table
if ( $table) @mysql_free_result( $id);
return  $res;
}

/* private: error handling */
function halt( $msg) {
 $this->Error = @mysql_error( $this->Link_ID);
 $this->Errno = @mysql_errno( $this->Link_ID);
if ( $this->Halt_On_Error == "no")
return;

 $this->haltmsg( $msg);

if ( $this->Halt_On_Error != "report")
die("Session halted.");
}

function haltmsg( $msg) {
printf("</td></tr></table><b>Database error:</b> %s<br>n",  $msg);
printf("<b>MySQL Error</b>: %s (%s)<br>n",
 $this->Errno,
 $this->Error);
}

function table_names() {
 $this->query("SHOW TABLES");
 $i=0;
while ( $info=mysql_fetch_row( $this->Query_ID))
{
 $return[ $i]["table_name"]=  $info[0];
 $return[ $i]["tablespace_name"]= $this->Database;
 $return[ $i]["database"]= $this->Database;
 $i ;
}
return  $return;
}
}
?>

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