我正在尝试在php函数中包装MySQL查询
我有两个问题
1。）下面的代码工作但我需要在每个函数中包含数据库连接。我是否可以全局调用db.php而无需添加require("db.php");
的functions.php
function GetUsers($id, $active){
require("db.php");
$result = $mysqli->query("SELECT * FROM users WHERE id = '$id' and active = '$active' ") or trigger_error(mysql_error());
return $result;
}
的index.php
include("functions.php");
$id = 2;
$active = 1;
$row = GetGetUsers ($id, $active);
foreach($row as $users) {
echo '<h1>'. $users['username']. '</h1>';
echo '<p>'. $users['email']. '</p>';
}
2。）我尝试使用mysql编写的语句完全相同的代码
的functions.php
function GetAccounts($id, $active){
require("db.php");
$result = $mysqli->prepare("SELECT * FROM users WHERE id = ? and active = ? ") or trigger_error(mysql_error());
$result->bind_param('ii', $id, $active);
$result->execute();
$result->close();
return $result;
}
db.php中
$mysqli = new mysqli(); $mysqli->connect('localhost', 'root', 'mysql', 'function_test');
真的很感激任何评论和解答我的两个问题。
答案 0 :(得分：-1)
这是我在整个项目中使用的课程。
试试这个
<?php
class access_db{
function Connect() {
$this->con= new mysqli("localhost","accoladets","accolad3TS", "accoladets") or die(mysqli_error());
}
function eClose(){
mysqli_close($this->con);
}
/**Insert data
* @param string $table name of the table
* @param string $field table field eg. "field1,field2,field3"
* @param string $param field parameters subtitute eg. "(?,?,?)"
* @param array $valarr array of field values eg. array("string1",2,"string3") or array(array(),array())
* @param string $option (optional)
* Available option: <b>get_id</b> - (for single insert only)get the last auto generated id after query.
* @param string $option2 (optional). multi or NULL
* @return boolean true, error message or the expected value of the given option
*/
function insert_data($table,$field,$param,$valarr,$option = NULL,$option2 = NULL){
$this->Connect();
$sql = "INSERT INTO ".$table." (".$field.") VALUES ".$param;
if($stmt = $this->con->prepare($sql)){
if($option2 == 'multi'){
$idarr = array();
foreach($valarr as $v){
$this->dynamic_bind_param($stmt, $v);
if($stmt->execute()){
if(is_null($option) == true){
$idarr = true;
}else{
if($option == 'get_id'){
$idarr[] = $stmt->insert_id;
}
}
}else{
return '<b>(INSERT Error)</b> Error in executing the prepared statement: '.htmlspecialchars($stmt->error);
exit();
}
}
return $idarr;
exit();
}else{
$this->dynamic_bind_param($stmt, $valarr);
if($stmt->execute()){
if(is_null($option) == true){
return true;
}else{
if($option == 'get_id'){
return $stmt->insert_id;
}
}
}else{
return '<b>(INSERT Error)</b> Error in executing the prepared statement: '.htmlspecialchars($stmt->error);
exit();
}
}
}else{
return '<b>(INSERT Error)</b> Error in initializing the prepared statement: '.htmlspecialchars($stmt->error).'SQL: '.$sql.' VALUES: '.json_encode($valarr);
exit();
}
$stmt->close();
$this->eClose();
}
/**Update data
* @param string $table name of the table
* @param string $field table field eg. "field1 = ?, field2 = ?, field3 = ?"
* @param string $where database filter eg. "filter1 = ? AND filter2 = ?" or ""
* @param array $valarr array of field values eg. array("string1",2,"string3")
* @return boolean true or error message
*/
function update_data($table,$field,$where,$valarr){
$this->Connect();
$where = ($where == '')? '' : 'WHERE '.$where;
$sql = "UPDATE ".$table." SET ".$field." ".$where;
if($stmt = $this->con->prepare($sql)){
$this->dynamic_bind_param($stmt, $valarr);
if($stmt->execute()){
return true;
}else{
return '<b>(UPDATE Error)</b> Error in executing the prepared statement: '.htmlspecialchars($stmt->error).'SQL: '.$sql.' Values: '.json_encode($valarr);
exit();
}
}else{
return '<b>(UPDATE Error)</b> Error in initializing the prepared statement: '.htmlspecialchars($stmt->error).'SQL: '.$sql;
exit();
}
$stmt->close();
$this->eClose();
}
/**Delete data
* @param string $table name of the table
* @param string $where database filter eg. "filter1 IN (1,2,3) AND filter = 4"
* @return boolean true or error message
*/
function delete_data($table,$where = NULL){
$this->Connect();
$where = (is_null($where) == true)? '' : 'WHERE '.$where;
$sql = "DELETE FROM ".$table." ".$where;
$qry = $this->con->query($sql);
if($qry){
return true;
}else{
return '<b>(Delete Error)</b> Error executing the delete query: '.htmlspecialchars($this->con->error);
}
$this->eClose();
}
/**Get table data
* @param string $table name of the table
* @param string $field table field eg. "field1, field2, field3"
* @param string $orderby database filter eg. "field1 ASC" or NULL
* @param string $where database filter eg. "filter1 = ? AND filter2 = ?" or NULL
* @param array $valarr array of field values eg. array("string1",2,"string3") or NULL
* @return array Multidimensional_Arrays Two-dimensional Arrays
*
* Array([0] => Array([field1] => string1,[field2] => 2,[field3] => string3))
*/
function get_table_data($table,$field,$orderby = NULL,$where = NULL,$valarr = NULL){
$this->Connect();
$fields = array();
$results = array();
$orderby = (is_null($orderby) == true)? '' : 'ORDER BY '.$orderby;
$where = (is_null($where) == true)? '' : 'WHERE '.$where;
$sql = "SELECT ".$field." FROM ".$table." ".$where." ".$orderby;
if($stmt = $this->con->prepare($sql)){
if(is_null($valarr) == false){
$this->dynamic_bind_param($stmt, $valarr);
}
if($stmt->execute()){
$meta = $stmt->result_metadata();
while ($field = $meta->fetch_field()) {
$var = $field->name;
$$var = null;
$fields[$var] = &$$var;
}
call_user_func_array(array($stmt,'bind_result'),$fields);
$i = 0;
while ($stmt->fetch()) {
$results[$i] = array();
foreach($fields as $k => $v){
$results[$i][$k] = $v;
}
$i++;
}
return $results;
}else{
return '<b>(SELECT Error)</b> Error in executing the prepared statement: '.htmlspecialchars($stmt->error).'SQL: '.$sql;
}
}else{
return '<b>(SELECT Error)</b> Error in initializing the prepared statement: '.htmlspecialchars($stmt->error).'SQL: '.$sql;
}
$stmt->close();
$this->eClose();
}
private function dynamic_bind_param($stmt,$values){
if(is_array($values) == true){
$types = '';
foreach($values as $param) {
// set param type
if (is_string($param)) {
$types .= 's'; // strings
} else if (is_int($param)) {
$types .= 'i'; // integer
} else if (is_float($param)) {
$types .= 'd'; // double
} else {
$types .= 'b'; // default: blob and unknown types
}
}
$paramArr[] = &$types;
for ($i=0; $i<count($values);$i++){
$paramArr[] = &$values[$i];
}
call_user_func_array(array($stmt,'bind_param'), $paramArr);
}else{
if (is_string($values)) {
$types .= 's'; // strings
} else if (is_int($values)) {
$types .= 'i'; // integer
} else if (is_float($values)) {
$types .= 'd'; // double
} else {
$types .= 'b'; // default: blob and unknown types
}
$stmt->bind_param($types,$values);
}
return $stmt;
}
}
?>
在你的php代码中，将这一行添加到所有其他require_once '../class/db_fn_class.php';之上，根据你放置它的位置改变类文件的路径，然后将其实例化为类似$access_db = new access_db();的内容。这是一个如何在实例化后使用它的例子。
$data = $access_db->get_table_data("users","field1,field2",NULL,"id = ? AND active = ?",array($id, $active));
它将返回一个对象数组中的数据，所以这里是如何提取数据
foreach($data as $val){
$f1 = $val["field2"]; // use the name of every table field you put on the get_table_data as the array id of the $val. $val is user_define and so as $data
$f2 = $val["field2"]
}