将变量作为行插入到mysql数据库中的代码不起作用（PHP）

Question

I'm trying to get variables to input as rows to columns in a mysql database (I'm new to both mysql and php) via php. However, it doesn't seem to work and this test code I put in fails every time. Again I'm new to this, so if I'm making a stupid mistake please point it out nicely.

$conn = new mysqli ("localhost", "root", "", "testdb");
echo "Database connection successful";
echo '<br />';
$test1 = "a";
$test2 = "a";
$test3 = "a";
$test4 = "a";
$test5 = "a";
$query = "INSERT INTO testtable (testcolumn1, testcolumn2, testcolumn3, testcolumn4, testcolumn5) VALUES ('$test1', '$test2', '$test3', '$test4', '$test5')";
if ($conn->query($query) === TRUE) {
    echo "passed";
} else {
    echo "failed";
}

The database and table and columns are all valid and present, it's something to do with how I'm using the query. Can anyone help?

Answer 1

Sample

MariaDB [bb]> insert into table (val) VALUES(99);
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'table (val) VALUES(99)' at line 1

MariaDB [bb]> insert into `table` (val) VALUES(99);
Query OK, 1 row affected (0.00 sec)

MariaDB [bb]>

and your query:

you can copy it

INSERT INTO `table` (testcolumn1, testcolumn2, testcolumn3, testcolumn4, testcolumn5) VALUES ('$test1', '$test2', '$test3', '$test4', '$test5')

Answer 2

The script seems to be working fine. I was able to execute the following script without a problem.

<?php

$conn = new mysqli ("localhost", "newuser", "password", "testdb");
echo "Database connection successful";
echo '<br />';
$test1 = "a";
$test2 = "a";
$test3 = "a";
$test4 = "a";
$test5 = "a";
$query = "INSERT INTO testtable (testcolumn1, testcolumn2, testcolumn3, testcolumn4, testcolumn5) VALUES ('$test1', '$test2', '$test3', '$test4', '$test5');";
if ($conn->query($query) === TRUE) {
    echo "passed";
} else {
    echo "failed";
}

Double check your Database connection.

Answer 3

can you try the below code, and another thing just asking did you checked the auto increment field of primary key.

    $conn = new mysqli ("localhost", "root", "", "testdb");
    if(!$conn){
       echo "Database connection failed";
    } else {
       echo "Database connection successful";
        echo '<br />';
        $test1 = "a";
        $test2 = "a";
        $test3 = "a";
        $test4 = "a";
        $test5 = "a";


       $query = "INSERT INTO testtable (testcolumn1, testcolumn2,    testcolumn3, testcolumn4, testcolumn5)
        VALUES ('$test1', '$test2', '$test3', '$test4', '$test5');";
      if ($conn->query($query) === TRUE) {
        echo "passed";
      } else {
      echo "failed";
   }
}