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<?php
/**
* Close connection.
*/
function sql_close()
{
global $sql_connection;
return $sql_connection->close();
}
/**
* Return NULL if given value is null.
*/
function sql_null($value = null)
{
return $value == null ? 'NULL' : ("'" . sql_escape($value) . "'");
}
/**
* Start new transaction.
*/
function sql_transaction_start()
{
global $sql_nested_transaction_level;
if ($sql_nested_transaction_level ++ == 0) {
return sql_query("BEGIN");
}
return true;
}
/**
* Commit transaction.
*/
function sql_transaction_commit()
{
global $sql_nested_transaction_level;
if (-- $sql_nested_transaction_level == 0) {
return sql_query("COMMIT");
}
return true;
}
/**
* Stop transaction, revert database.
*/
function sql_transaction_rollback()
{
global $sql_nested_transaction_level;
if (-- $sql_nested_transaction_level == 0) {
return sql_query("ROLLBACK");
}
return true;
}
/**
* Logs an sql error.
*
* @param string $message
* @return false
*/
function sql_error($message)
{
sql_close();
$message = trim($message) . "\n";
$message .= debug_string_backtrace() . "\n";
error_log('mysql_provider error: ' . $message);
return false;
}
/**
* Connect to mysql server.
*
* @param string $host
* Host
* @param string $user
* Username
* @param string $pass
* Password
* @param string $db_name
* DB to select
* @return mysqli The connection handler
*/
function sql_connect($host, $user, $pass, $db_name)
{
global $sql_connection;
$sql_connection = new mysqli($host, $user, $pass, $db_name);
if ($sql_connection->connect_errno) {
error("Unable to connect to MySQL: " . $sql_connection->connect_error);
return sql_error("Unable to connect to MySQL: " . $sql_connection->connect_error);
}
$result = $sql_connection->query("SET CHARACTER SET utf8;");
if (! $result) {
return sql_error("Unable to set utf8 character set (" . $sql_connection->errno . ") " . $sql_connection->error);
}
$result = $sql_connection->set_charset('utf8');
if (! $result) {
return sql_error("Unable to set utf8 names (" . $sql_connection->errno . ") " . $sql_connection->error);
}
return $sql_connection;
}
/**
* Change the selected db in current mysql-connection.
*
* @param
* $db_name
* @return bool true on success, false on error
*/
function sql_select_db($db_name)
{
global $sql_connection;
if (! $sql_connection->select_db($db_name)) {
return sql_error("No database selected.");
}
return true;
}
/**
* MySQL SELECT query
*
* @param string $query
* @return Result array or false on error
*/
function sql_select($query)
{
global $sql_connection;
// echo $query . ";\n";
// echo debug_string_backtrace() . "\n";
$result = $sql_connection->query($query);
if ($result) {
$data = [];
while ($line = $result->fetch_assoc()) {
array_push($data, $line);
}
return $data;
}
return sql_error("MySQL-query error: " . $query . " (" . $sql_connection->errno . ") " . $sql_connection->error);
}
/**
* MySQL execute a query
*
* @param string $query
* @return mysqli_result boolean resource or false on error
*/
function sql_query($query)
{
global $sql_connection;
$result = $sql_connection->query($query);
if ($result) {
return $result;
}
return sql_error("MySQL-query error: " . $query . " (" . $sql_connection->errno . ") " . $sql_connection->error);
}
/**
* Returns last inserted id.
*
* @return int
*/
function sql_id()
{
global $sql_connection;
return $sql_connection->insert_id;
}
/**
* Escape a string for a sql query.
*
* @param string $query
* @return string
*/
function sql_escape($query)
{
global $sql_connection;
return $sql_connection->real_escape_string($query);
}
/**
* Convert a boolean for mysql-queries.
*
* @param boolean $boolean
* @return string
*/
function sql_bool($boolean)
{
return $boolean == true ? 'TRUE' : 'FALSE';
}
/**
* Count query result lines.
*
* @param string $query
* @return int Count of result lines
*/
function sql_num_query($query)
{
return sql_query($query)->num_rows;
}
function sql_select_single_col($query)
{
$result = sql_select($query);
return array_map('array_shift', $result);
}
function sql_select_single_cell($query)
{
return array_shift(array_shift(sql_select($query)));
}
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