In our website design process, multi-condition queries are often used. the source code of this article is an example of a second-hand house query. In this example, we need to obtain the information required by the customer through multiple conditions, such as geographical location, property type, house price, house area, and information release date. The following is the implementation process. Query condition interface (omitted): search. php often uses multi-condition query during the design of our website. The source code of this article is an example of a second-hand house query. In this example, we need to obtain the information required by the customer through multiple conditions, such as geographical location, property type, house price, house area, and information release date. The following is the implementation process.
Query condition interface (omitted ):
Search. php)
1. generate a query statement:
$ Conn = mysql_connect ("localhost", "root ","");
$ Db = mysql_select_db ("lingyun ");
$ Query = "select * from message where tradetype = '". $ tradetype. "'"; // transaction type, such as rent or sale
$ SQL = $ SQL. "wuye = '". $ wuye ."'";
If ($ housetype! = "Unlimited "){
$ Query. = "& housetype = '". $ housetype. "'"; // house type, such as Room 2, Room 1, Room 3, and room 2
}
If ($ degree! = "Unlimited "){
$ Query. = "& degree = '". $ degree. "'"; // New or old
}
If ($ wuye! = "Unlimited "){
$ Query. = "& wuye = '". $ wuye. "'"; // property types such as housing and shops
}
If ($ price2! = ""){
Switch ($ price1 ){
Case "greater ":
$ Query. = "& price> '". $ price2. "'"; // price
Break;
Case "equal ":
$ Query. = "& price = '". $ price2 ."'";
Break;
Case "less ":
$ Query. = "& price <'". $ price2 ."'";
Break;
}
}
If ($ area2! = ""){
Switch ($ area1 ){
Case "greater ":
$ Query. = "& area> '". $ area2. "'"; // area
Break;
Case "equal ":
$ Query. = "& area = '". $ area2 ."'";
Break;
Case "less ":
$ Query. = "& area <'". $ area2 ."'";
Break;
}
}
Switch ($ pubdate) {// release date
Case "within this week ":
$ Query. = "& TO_DAYS (NOW ()-TO_DAYS (date) <= 7 ";
Break;
Case "within one month ":
$ Query. = "& TO_DAYS (NOW ()-TO_DAYS (date) <= 30 ";
Break;
Case "within three months ":
$ Query. = "& TO_DAYS (NOW ()-TO_DAYS (date) <= 91 ";
Break;
Case "within six months ":
$ Query. = "& TO_DAYS (NOW ()-TO_DAYS (date) <= 183 ";
Break;
}
If ($ address! = ""){
$ Query. = "& address like '% $ address %'"; // address
}
If (! $ Page ){
$ Page = 1;
}
?>
II. output query results:
If ($ page ){
$ Page_size = 20;
$ Result = mysql_query ($ query );
# $ Message_count = mysql_result ($ result, 0, "total ");
$ Message_count = 10;
$ Page_count = ceil ($ message_count/$ page_size );
$ Offset = ($ page-1) * $ page_size;
$ Query = $ query. "order by date desc limit $ offset, $ page_size ";
$ Result = mysql_query ($ query );
If ($ result ){
$ Rows = mysql_num_rows ($ result );
If ($ rows! = 0 ){
While ($ myrow = mysql_fetch_array ($ result )){
Echo"";
Echo"";
Echo"$ Myrow [id] $ myrow [tradetype] $ myrow [address] $ myrow [wuye] ($ myrow [housetype]) [$ myrow [date] ";
Echo"";
Echo"Details";
Echo"";
}
}
Else echo"
No record meeting your conditions found
";
}
$ Prev_page = $ page-1;
$ Next_page = $ page 1;
Echo"
";
Echo "no.". $ page. "/". $ page_count. "page ";
If ($ page <= 1 ){
Echo "| page 1 | ";
}
Else {
Echo "| page 1 | ";
}
Echo "";
If ($ prev_page <1 ){
Echo "| previous page | ";
}
Else {
Echo "| previous page | ";
}
Echo "";
If ($ next_page> $ page_count ){
Echo "| next page | ";
}
Else {
Echo "| next page | ";
}
Echo "";
If ($ page >=$ page_count ){
Echo "| last page | ";
}
Else {
Echo "| last page | ";
}
Echo"
";
}
Else {
Echo"
No rental information is available now!
";
}
Echo" ";
?>
If any problem occurs during use, please contact me (yk_lingyun@21cn.com), please correct me!
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