Why Mysql_fetch_array did not execute

Why is mysql_fetch_array not executed?
citation

error_reporting (0);
$conn =mysql_connect ("localhost", "root", "root");//fill in the database connection information
mysql_select_db ("a1209173000");//fill in the database name
$valA = $_post["ValA"];
if ($valA! = "") {
$sql = "SELECT * from table where chepai= '". $valA. "'";
$result =mysql_query ($sql);
while ($arr =mysql_fetch_array ($result))
{
echo $arr ["name"]. "
";
}
}else{
?>

}
?>

By adding the echo output at the back of each line, the discovery executes to the while ($arr =mysql_fetch_array ($result)) when there is no execution, what's wrong, $sql normal

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------Solution--------------------

$result =mysql_query ($sql);
if (Mysql_error ()) {
  Echo Mysql_errno (). ": " . Mysql_error (). "\ n";
}

See if there's an error?
------Solution--------------------
In
mysql_select_db ("a1209173000");//fill in the database name
After that, join
mysql_query (' Set names GBK ');
This is caused by inconsistencies between the data being manipulated and the default character set of the database

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