PHP Data Access Bulk Delete (10261101)

<! DOCTYPE html Public"-//w3c//dtd XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >Name:<input type= "text" Name= "XM"/><input type= "submit" value= "Query"/></div></form><br/> <form action= "1101morningpiliangshanchu.php" method= "POST" ><table width= "100%" border= "1" cellpadding= "0"        cellspacing= "0" > <tr> <td><input type= "checkbox" onclick= "Quanxuan (This)"/> Code </td>         <td> name </td> <td> gender </td> <td> National </td> <td> Birthday </td> <td> operation </td> </tr><?PHP//Query rule: When the user does not enter the case, the query is all the data//first to determine if there is no commit value/*simplify the pre-$xm= "", if (!empty ($_post["XM"))//empty (); Add a conditional judgment to prevent error {$XM = $_post["XM"]; }//simplified before $tj = ""; if ($XM = = "")//if there is no value, check all, without conditions, or give a constant set of conditions. If there is a value, look for {$TJ = "1=1";//Do not forget to add a space on both sides (convenient splicing SQL statement)}else{$TJ = "name like '%{$xm}% '";//Don't forget to add space on both sides, fuzzy query with like}/    /simplified after $tj = "1=1";//default constant Set if ($XM! = "") {$tj = "name like '%{$xm}% '"; }*///simplify and then one:$XXM= "";$TJ= "1=1";if(!Empty($_post["XM"]) &&$_post["XM"]! = "" ")//determine if XM is empty{    $XXM=$_post["XM"]; $TJ= "Name like '%{$_post[' XM ']} %‘ ";//You can add a single quotation mark to a variable}/*Simplified Two: $tj = "1=1", if (!empty ($_post["XM"))//Determine if XM is empty {if ($_post["XM"]! = ")//Determine if XM is an empty string {$tj =" NA        Me like '%{$xm}% ' "; }}*///Connecting Objects$db=NewMysqli ("localhost", "root", "Database Password", "1016");//Write SQL statements$sql= "SELECT * from Info where".$TJ;//(stitching the SQL statement, where the space behind is to prevent the concatenation of the statement error.) alone is because if you write a sentence, the user if nothing input, the value of the query is empty, this conflict with the query law that the user does not input anything, query all data)//Execute SQL statement $result=$db->query ($sql);//read the data and return a two-dimensional array$attr=$result-Fetch_all ();//foreach iterates through the array,foreach($attr  as $v)//$attr as $v take every decimal group inside the attr{    Echo"<tr>"; $sex=$v[2]? " Male ":" Female ";//Array v $v index Two, with the ternary operator, the front is a Boolean data, true display male, false display female 0 false,1 true//According to the National Code query national name can also use join query, but generally not recommended, because the number of queries It's too big.        /*$sname = "SELECT name from Nation where code = ' {$v [3]} '";    $rname = $db->query ($sname); $aname = $rname->fetch_row ();*/        $name= Nationname ($v[3]); //make keywords highlight <mark></mark>    /*simplified in the above $XXM = "";//the XXM variable is defined in the outer layer if (!empty ($_post["XM"))//And then determine if there is a commit value {$XXM = $_post["XM"];//have the value of the message to take X m}*/    //Replace keyword    $newname=Str_replace($XXM, "<mark>{$XXM}</mark> ",$v[1]);//find replacements, the first parameter: keywords, according to what to look for; the second keyword, the replacement of the content; the third argument: which string to replace, that is, the area to replace//check with the array to submit sc[], to the processing page, the array can be traversed    Echo"<td><input type= ' checkbox ' value= ' {$v[0]} ' Name= ' sc[] ' class= ' QX '/>{$v[0]} </td><td>{$newname}</td><td>{$sex}</td><td>{$name}</td><td>{$v[4]} </td><td><a href= ' 1028afternoonshanchu.php?c={$v[0]} ' > Delete </a> <a href= ' 1030morningxiugai.php?c={$v[0]} ' > Modify </a></td> "; //jump to another page and take a value the way it used to be is get, so we're going to simulate a get-pass method? c={$v [0]}//To add a delete function first let it click, one method is a button, the other is the <a> tag. Styles can be done casually, such as adding a nice div to the outside, plus a <a> tag inside.         /*the output of the two methods of foreach ($v as $v 1) {echo "<td>{$v 1}</td>"; }*/        Echo"</tr>";} //give a national code, return the name of the Nation    functionNationname ($code)    {        //Connecting Objects        $db=NewMysqli ("localhost", "root", "Database Password", "1016"); //Write SQL statements        $sql= "SELECT name from Nation where Code= ' {$code}‘"; //Execute SQL statement        $result=$db->query ($sql); $attr=$result-Fetch_row (); return $attr[0]; }></table><a href= "1028afternoonadd.php" ><input type= "button" value= "Add Data"/></a>< Input type= "submit" value= "bulk Delete" onclick= "return confirm (' OK to delete? ') "/></form><!--Bulk Delete ideas: Think of checkboxes and bulk delete buttons as a form--><script>functionQuanxuan (a) {//Find all of the check boxes below    varck = Document.getelementsbyclassname ("QX"); //not the document points out there is no hint, if you are afraid of mistakes can be here to define a variable and then point out and then copy over//Traverse all check boxes, set the selected state     for(vari=0;i<ck.length;i++)    {        if(A.checked) {            /*setAttribute ("Checked", "checked") Set properties ("First name"; "Value")*/Ck[i]. SetAttribute ("Checked", "checked"); }        Else        {            /*removeattribute ("Checked", "checked") Remove attribute ("First name"; "Value")*/Ck[i]. RemoveAttribute ("Checked", "" "); }    }}</script></body>1028afternoonmain.php
<! DOCTYPE html Public"-//w3c//dtd XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >$_post[] is empty, you can also determine the variablewhether the $a is empty--><?PHP//empty (); Determine if the variable has no assignment or the value is an empty string, 0 so for example, if the query is empty, when the input 0 will be queried all//$a = "";//var_dump (empty ($a));// When the variable is 0 or "" The empty string is also true, will be 0 or "" as the null//isset judgment variable has not been defined, there is no setting, set the return to True, no set return false//$b =0;//var_dump (isset ($b)); Returns True when the variable is 0 or "", that is, no 0 or "" as an empty//is_null to determine whether it is empty, undefined$c=NULL;Var_dump(Is_null($c));//cannot determine a variable not defined//when the variable is undefined or defined but not assigned, that is, NULL returns TRUE when the variable is 0 or "" empty string returns False, that is, 0 or "" as empty?></body>1101morningceshi.php
<?PHP$attr=Array();//define an empty arrayif(!Empty($_post["SC"])){    $attr=$_post["SC"];}$db=NewMysqli ("localhost", "root", "Database Password", "1016"); //the above sentence was put outside to prevent the loop from being built once every time it was executed ./*before optimization (once per SQL statement) foreach ($attr as $v) {$sql = "Delete from info where code= ' {$v} '"; $db->query ($sql);}*///after optimization: Delete a set of data using the in Split string to return an array of explode array concatenation string implode//implode (); First argument: Delimiter second argument: array$str=implode("‘,‘",$attr);$sql= "Delete from info where code in (' {$str}‘)"; $db->query ($sql);Header:("location:1028afternoonmain.php");?>
1104piliangshanchu.php
PHP Data Access Bulk Delete (10261101)