diff --git a/src/ConnectionManager.php b/src/ConnectionManager.php
index 8b699fd..d8617b6 100644
--- a/src/ConnectionManager.php
+++ b/src/ConnectionManager.php
@@ -105,7 +105,8 @@ final class ConnectionManager {
 		{
 			return $this->connections[$name];
 		}
-		else if (empty($name) && ! empty($this->connections)) // Otherwise, return the last one
+
+		if (empty($name) && ! empty($this->connections)) // Otherwise, return the last one
 		{
 			return end($this->connections);
 		}
@@ -123,10 +124,10 @@ final class ConnectionManager {
 	 */
 	public function connect($params): QueryBuilderInterface
 	{
-		[$dsn, $dbtype, $params, $options] = $this->parseParams($params);
+		[$dsn, $dbType, $params, $options] = $this->parseParams($params);
 
-		$dbtype = ucfirst($dbtype);
-		$driver = "\\Query\\Drivers\\{$dbtype}\\Driver";
+		$dbType = ucfirst($dbType);
+		$driver = "\\Query\\Drivers\\{$dbType}\\Driver";
 
 		// Create the database connection
 		$db =  ! empty($params->user)
@@ -159,19 +160,19 @@ final class ConnectionManager {
 	/**
 	 * Parses params into a dsn and option array
 	 *
-	 * @param \stdClass $params
-	 * @return object|array
+	 * @param object | array $params
+	 * @return array
 	 * @throws Exception\BadDBDriverException
 	 */
 	public function parseParams($params): array
 	{
 		$params = (object) $params;
 		$params->type = strtolower($params->type);
-		$dbtype = ($params->type !== 'postgresql') ? $params->type : 'pgsql';
-		$dbtype = ucfirst($dbtype);
+		$dbType = ($params->type !== 'postgresql') ? $params->type : 'pgsql';
+		$dbType = ucfirst($dbType);
 
 		// Make sure the class exists
-		if ( ! class_exists("\\Query\\Drivers\\{$dbtype}\\Driver"))
+		if ( ! class_exists("\\Query\\Drivers\\{$dbType}\\Driver"))
 		{
 			throw new Exception\BadDBDriverException('Database driver does not exist, or is not supported');
 		}
@@ -185,28 +186,28 @@ final class ConnectionManager {
 		}
 
 		// Create the dsn for the database to connect to
-		if(strtolower($dbtype) === 'sqlite')
+		if(strtolower($dbType) === 'sqlite')
 		{
 			$dsn = $params->file;
 		}
 		else
 		{
-			$dsn = $this->createDsn($dbtype, $params);
+			$dsn = $this->createDsn($dbType, $params);
 		}
 
 
-		return [$dsn, $dbtype, $params, $options];
+		return [$dsn, $dbType, $params, $options];
 	}
 
 	/**
 	 * Create the dsn from the db type and params
 	 *
 	 * @codeCoverageIgnore
-	 * @param string $dbtype
+	 * @param string $dbType
 	 * @param array|object $params
 	 * @return string
 	 */
-	private function createDsn(string $dbtype, $params): string
+	private function createDsn(string $dbType, $params): string
 	{
 		$pairs = [];
 
@@ -234,6 +235,6 @@ final class ConnectionManager {
 			}
 		}
 
-		return strtolower($dbtype) . ':' . implode(';', $pairs);
+		return strtolower($dbType) . ':' . implode(';', $pairs);
 	}
 }
\ No newline at end of file
diff --git a/src/Drivers/AbstractDriver.php b/src/Drivers/AbstractDriver.php
index 5cee898..3c1d345 100644
--- a/src/Drivers/AbstractDriver.php
+++ b/src/Drivers/AbstractDriver.php
@@ -131,6 +131,8 @@ abstract class AbstractDriver
 		{
 			return \call_user_func_array([$this->$name, '__invoke'], $args);
 		}
+
+		return NULL;
 	}
 
 	// --------------------------------------------------------------------------
@@ -325,10 +327,8 @@ abstract class AbstractDriver
 		foreach($funcs as $f)
 		{
 			// Unquote the function
-			$raw = str_replace($f[0], $f[1], $raw);
-
 			// Quote the inside identifiers
-			$raw = str_replace($f[3], $this->quoteIdent($f[3]), $raw);
+			$raw = str_replace(array($f[0], $f[3]), array($f[1], $this->quoteIdent($f[3])), $raw);
 		}
 
 		return $raw;
@@ -341,7 +341,8 @@ abstract class AbstractDriver
 	 */
 	public function getSchemas(): ?array
 	{
-		return NULL;
+		// Most DBMSs conflate schemas and databases
+		return $this->getDbs();
 	}
 
 	/**
@@ -361,7 +362,7 @@ abstract class AbstractDriver
 	 *
 	 * @return array
 	 */
-	public function getDbs(): array
+	public function getDbs(): ?array
 	{
 		return $this->driverQuery('dbList');
 	}
@@ -435,7 +436,7 @@ abstract class AbstractDriver
 	 * @param string $table
 	 * @return array
 	 */
-	public function getColumns($table): ?array
+	public function getColumns(string $table): ?array
 	{
 		return $this->driverQuery($this->getSql()->columnList($this->prefixTable($table)), FALSE);
 	}
@@ -446,7 +447,7 @@ abstract class AbstractDriver
 	 * @param string $table
 	 * @return array
 	 */
-	public function getFks($table): ?array
+	public function getFks(string $table): ?array
 	{
 		return $this->driverQuery($this->getSql()->fkList($table), FALSE);
 	}
@@ -457,7 +458,7 @@ abstract class AbstractDriver
 	 * @param string $table
 	 * @return array
 	 */
-	public function getIndexes($table): ?array
+	public function getIndexes(string $table): ?array
 	{
 		return $this->driverQuery($this->getSql()->indexList($this->prefixTable($table)), FALSE);
 	}
diff --git a/src/Drivers/AbstractUtil.php b/src/Drivers/AbstractUtil.php
index 61d605e..8401395 100644
--- a/src/Drivers/AbstractUtil.php
+++ b/src/Drivers/AbstractUtil.php
@@ -16,9 +16,6 @@ namespace Query\Drivers;
 
 /**
  * Abstract class defining database / table creation methods
- *
- * @method string quoteIdent(string $sql)
- * @method string quoteTable(string $sql)
  */
 abstract class AbstractUtil {
 
@@ -43,7 +40,7 @@ abstract class AbstractUtil {
 	 *
 	 * @return DriverInterface
 	 */
-	public function getDriver()
+	public function getDriver(): DriverInterface
 	{
 		return $this->connection;
 	}
@@ -57,7 +54,7 @@ abstract class AbstractUtil {
 	 * @param bool $ifNotExists
 	 * @return string
 	 */
-	public function createTable($name, $fields, array $constraints=[], $ifNotExists=TRUE)
+	public function createTable($name, $fields, array $constraints=[], $ifNotExists=TRUE): string
 	{
 		$existsStr = $ifNotExists ? ' IF NOT EXISTS ' : ' ';
 
@@ -77,8 +74,8 @@ abstract class AbstractUtil {
 		foreach($columnArray as $n => $props)
 		{
 			$str = $this->getDriver()->quoteIdent($n);
-			$str .= isset($props['type']) ? " {$props['type']}" : "";
-			$str .= isset($props['constraint']) ? " {$props['constraint']}" : "";
+			$str .= isset($props['type']) ? " {$props['type']}" : '';
+			$str .= isset($props['constraint']) ? " {$props['constraint']}" : '';
 
 			$columns[] = $str;
 		}
@@ -112,7 +109,7 @@ abstract class AbstractUtil {
 	 * @abstract
 	 * @return string
 	 */
-	abstract public function backupStructure();
+	abstract public function backupStructure(): string;
 
 	/**
 	 * Return an SQL file with the database data as insert statements
@@ -120,6 +117,6 @@ abstract class AbstractUtil {
 	 * @abstract
 	 * @return string
 	 */
-	abstract public function backupData();
+	abstract public function backupData(): string;
 
 }
\ No newline at end of file
diff --git a/src/Drivers/DriverInterface.php b/src/Drivers/DriverInterface.php
index e4140ce..bf94fcf 100644
--- a/src/Drivers/DriverInterface.php
+++ b/src/Drivers/DriverInterface.php
@@ -15,12 +15,27 @@
 namespace Query\Drivers;
 
 use InvalidArgumentException;
+use PDO;
 use PDOStatement;
 
 /**
  * PDO Interface to implement for database drivers
+ *
+ * @method beginTransaction(): bool
+ * @method commit(): bool
+ * @method errorCode(): string
+ * @method errorInfo(): array
+ * @method exec(string $statement): int
+ * @method getAttribute(int $attribute)
+ * @method inTransaction(): bool
+ * @method lastInsertId(string $name = NULL): string
+ * @method prepare(string $statement, array $driver_options = []): PDOStatement
+ * @method query(string $statement): PDOStatement
+ * @method quote(string $string, int $parameter_type = PDO::PARAM_STR): string
+ * @method rollback(): bool
+ * @method setAttribute(int $attribute, $value): bool
  */
-interface DriverInterface {
+interface DriverInterface /* extends the interface of PDO */ {
 
 	/**
 	 * Constructor/Connection method
@@ -48,7 +63,7 @@ interface DriverInterface {
 	 * @param string $table
 	 * @return array
 	 */
-	public function getColumns($table): ?array;
+	public function getColumns(string $table): ?array;
 
 	/**
 	 * Retrieve list of data types for the database
@@ -63,7 +78,7 @@ interface DriverInterface {
 	 * @param string $table
 	 * @return array
 	 */
-	public function getIndexes($table): ?array;
+	public function getIndexes(string $table): ?array;
 
 	/**
 	 * Retrieve foreign keys for the table
@@ -71,7 +86,7 @@ interface DriverInterface {
 	 * @param string $table
 	 * @return array
 	 */
-	public function getFks($table): ?array;
+	public function getFks(string $table): ?array;
 
 	/**
 	 * Return list of tables for the current database
@@ -88,6 +103,14 @@ interface DriverInterface {
 	 */
 	public function getSystemTables(): ?array;
 
+	/**
+	 * Return schemas for databases that list them. Returns
+	 * database list if schemas are databases for the current driver.
+	 *
+	 * @return array
+	 */
+	public function getSchemas(): ?array;
+
 	/**
 	 * Return list of dbs for the current connection, if possible
 	 *
@@ -207,6 +230,14 @@ interface DriverInterface {
 	 */
 	public function updateBatch(string $table, array $data, string $where): array;
 
+	/**
+	 * Empty the passed table
+	 *
+	 * @param string $table
+	 * @return PDOStatement
+	 */
+	public function truncate(string $table): PDOStatement;
+
 	/**
 	 * Get the SQL class for the current driver
 	 *
@@ -221,6 +252,13 @@ interface DriverInterface {
 	 */
 	public function getUtil(): AbstractUtil;
 
+	/**
+	 * Get the last sql query executed
+	 *
+	 * @return string
+	 */
+	public function getLastQuery(): string;
+
 	/**
 	 * Set the last query sql
 	 *
@@ -228,4 +266,12 @@ interface DriverInterface {
 	 * @return void
 	 */
 	public function setLastQuery(string $queryString): void;
+
+	/**
+	 * Set the common table name prefix
+	 *
+	 * @param string $prefix
+	 * @return void
+	 */
+	public function setTablePrefix(string $prefix): void;
 }
diff --git a/src/Drivers/Mysql/Util.php b/src/Drivers/Mysql/Util.php
index f4792cd..b830c0a 100644
--- a/src/Drivers/Mysql/Util.php
+++ b/src/Drivers/Mysql/Util.php
@@ -111,6 +111,7 @@ class Util extends AbstractUtil {
 				{
 					$r = $this->getDriver()->quote($r);
 				}
+				unset($r);
 				$row = array_map('trim', $row);
 
 				$rowString = 'INSERT INTO `'.trim($t).'` (`'.implode('`,`', $columns).'`) VALUES ('.implode(',', $row).');';
diff --git a/src/Drivers/Pgsql/Driver.php b/src/Drivers/Pgsql/Driver.php
index 2ea398f..02f4d9b 100644
--- a/src/Drivers/Pgsql/Driver.php
+++ b/src/Drivers/Pgsql/Driver.php
@@ -75,8 +75,10 @@ SQL;
 		{
 			foreach(['update', 'delete'] AS $type)
 			{
-				if ( ! isset($valueMap[$key[$type]])) continue;
-
+				if ( ! isset($valueMap[$key[$type]]))
+				{
+					continue;
+				}
 
 				$key[$type] = $valueMap[$key[$type]];
 			}
diff --git a/src/Drivers/Sqlite/Driver.php b/src/Drivers/Sqlite/Driver.php
index de8d06a..8dd15a0 100644
--- a/src/Drivers/Sqlite/Driver.php
+++ b/src/Drivers/Sqlite/Driver.php
@@ -14,6 +14,9 @@
  */
 namespace Query\Drivers\Sqlite;
 
+use function is_array;
+
+use InvalidArgumentException;
 use PDO;
 use Query\Drivers\AbstractDriver;
 
@@ -47,6 +50,16 @@ class Driver extends AbstractDriver {
 		parent::__construct($dsn, $user, $pass);
 	}
 
+	/**
+	 * Return list of dbs for the current connection, if possible. Meaningless for SQLite.
+	 *
+	 * @return array | null
+	 */
+	public function getDbs(): ?array
+	{
+		return NULL;
+	}
+
 	/**
 	 * List tables for the current database
 	 *
@@ -105,9 +118,9 @@ class Driver extends AbstractDriver {
 		// --------------------------------------------------------------------------
 
 		// Each member of the data array needs to be an array
-		if ( ! \is_array(current($data)))
+		if ( ! is_array(current($data)))
 		{
-			return NULL;
+			throw new InvalidArgumentException('$data must be an array of arrays');
 		}
 
 		// Start the block of sql statements
@@ -117,9 +130,9 @@ class Driver extends AbstractDriver {
 		// Create a key-value mapping for each field
 		$first = array_shift($data);
 		$cols = [];
-		foreach($first as $colname => $datum)
+		foreach($first as $colName => $datum)
 		{
-			$cols[] = $this->_quote($datum) . ' AS ' . $this->quoteIdent($colname);
+			$cols[] = $this->_quote($datum) . ' AS ' . $this->quoteIdent($colName);
 		}
 		$sql .= 'SELECT ' . implode(', ', $cols) . "\n";
 
diff --git a/src/Drivers/Sqlite/SQL.php b/src/Drivers/Sqlite/SQL.php
index 73ff60c..719f955 100644
--- a/src/Drivers/Sqlite/SQL.php
+++ b/src/Drivers/Sqlite/SQL.php
@@ -44,13 +44,14 @@ class SQL extends AbstractSQL {
 	}
 
 	/**
-	 * Returns sql to list other databases
+	 * Returns sql to list other databases. Meaningless for SQLite, as this
+	 * just returns the database(s) that we are currently connected to.
 	 *
 	 * @return string
 	 */
 	public function dbList(): string
 	{
-		return 'PRAGMA database_list';
+		return '';
 	}
 
 	/**
diff --git a/src/Drivers/Sqlite/Util.php b/src/Drivers/Sqlite/Util.php
index 11aeb9b..2980085 100644
--- a/src/Drivers/Sqlite/Util.php
+++ b/src/Drivers/Sqlite/Util.php
@@ -73,9 +73,11 @@ class Util extends AbstractUtil {
 				$row = array_values($row);
 
 				// Quote values as needed by type
-				for($i=0, $icount=count($row); $i<$icount; $i++)
+				foreach ($row as $i => $_)
 				{
-					$row[$i] = is_numeric($row[$i]) ? $row[$i] : $this->getDriver()->quote($row[$i]);
+					$row[$i] = (is_numeric($row[$i]))
+						? $row[$i]
+						: $this->getDriver()->quote($row[$i]);
 				}
 
 				$rowString = 'INSERT INTO "'.$r['name'].'" ("'.implode('","', $columns).'") VALUES ('.implode(',', $row).');';
@@ -112,6 +114,6 @@ class Util extends AbstractUtil {
 			$sqlArray[] = $r['sql'];
 		}
 
-		return implode(";\n", $sqlArray) . ";";
+		return implode(";\n", $sqlArray) . ';';
 	}
 }
\ No newline at end of file
diff --git a/src/QueryBuilder.php b/src/QueryBuilder.php
index dccb9e5..cd4235b 100644
--- a/src/QueryBuilder.php
+++ b/src/QueryBuilder.php
@@ -17,11 +17,47 @@ namespace Query;
 use function regexInArray;
 
 use BadMethodCallException;
+use PDO;
 use PDOStatement;
 use Query\Drivers\DriverInterface;
 
 /**
  * Convenience class for creating sql queries
+ *
+ * @method affectedRows(): int
+ * @method beginTransaction(): bool
+ * @method commit(): bool
+ * @method errorCode(): string
+ * @method errorInfo(): array
+ * @method exec(string $statement): int
+ * @method getAttribute(int $attribute)
+ * @method getColumns(string $table): array | null
+ * @method getDbs(): array | null
+ * @method getFks(string $table): array | null
+ * @method getFunctions(): array | null
+ * @method getIndexes(string $table): array | null
+ * @method getLastQuery(): string
+ * @method getProcedures(): array | null
+ * @method getSchemas(): array | null
+ * @method getSequences(): array | null
+ * @method getSystemTables(): array | null
+ * @method getTables(): array
+ * @method getTriggers(): array | null
+ * @method getTypes(): array | null
+ * @method getUtil(): \Query\Drivers\AbstractUtil
+ * @method getViews(): array | null
+ * @method inTransaction(): bool
+ * @method lastInsertId(string $name = NULL): string
+ * @method numRows(): int | null
+ * @method prepare(string $statement, array $driver_options = []): PDOStatement
+ * @method prepareExecute(string $sql, array $params): PDOStatement
+ * @method prepareQuery(string $sql, array $data): PDOStatement
+ * @method query(string $statement): PDOStatement
+ * @method quote(string $string, int $parameter_type = PDO::PARAM_STR): string
+ * @method rollback(): bool
+ * @method setAttribute(int $attribute, $value): bool
+ * @method setTablePrefix(string $prefix): void
+ * @method truncate(string $table): PDOStatement
  */
 class QueryBuilder implements QueryBuilderInterface {
 
@@ -49,7 +85,7 @@ class QueryBuilder implements QueryBuilderInterface {
 	 * The current database driver
 	 * @var DriverInterface
 	 */
-	public $driver;
+	protected $driver;
 
 	/**
 	 * Query parser class instance
@@ -93,7 +129,8 @@ class QueryBuilder implements QueryBuilderInterface {
 	}
 
 	/**
-	 * Calls a function further down the inheritance chain
+	 * Calls a function further down the inheritance chain.
+	 * 'Implements' methods on the driver object
 	 *
 	 * @param string $name
 	 * @param array $params
@@ -211,6 +248,16 @@ class QueryBuilder implements QueryBuilderInterface {
 		return $this;
 	}
 
+	/**
+	 * @todo implement
+	 * @param string $fields
+	 * @return $this
+	 */
+	public function returning(string $fields = '*'): QueryBuilderInterface
+	{
+		return $this;
+	}
+
 	/**
 	 * Adds the 'distinct' keyword to a query
 	 *
@@ -937,9 +984,9 @@ class QueryBuilder implements QueryBuilderInterface {
 	 * @param string $pos
 	 * @param string $like
 	 * @param string $conj
-	 * @return self
+	 * @return QueryBuilderInterface
 	 */
-	protected function _like(string $field, $val, string $pos, string $like='LIKE', string $conj='AND'): self
+	protected function _like(string $field, $val, string $pos, string $like='LIKE', string $conj='AND'): QueryBuilderInterface
 	{
 		$field = $this->driver->quoteIdent($field);
 
@@ -974,9 +1021,9 @@ class QueryBuilder implements QueryBuilderInterface {
 	 * @param mixed $key
 	 * @param mixed $values
 	 * @param string $conj
-	 * @return self
+	 * @return QueryBuilderInterface
 	 */
-	protected function _having($key, $values=[], string $conj='AND'): self
+	protected function _having($key, $values=[], string $conj='AND'): QueryBuilderInterface
 	{
 		$where = $this->_where($key, $values);
 
@@ -1040,9 +1087,9 @@ class QueryBuilder implements QueryBuilderInterface {
 	 * @param mixed $key
 	 * @param mixed $values
 	 * @param string $defaultConj
-	 * @return self
+	 * @return QueryBuilderInterface
 	 */
-	protected function _whereString($key, $values=[], string $defaultConj='AND'): self
+	protected function _whereString($key, $values=[], string $defaultConj='AND'): QueryBuilderInterface
 	{
 		// Create key/value placeholders
 		foreach($this->_where($key, $values) as $f => $val)
@@ -1087,9 +1134,9 @@ class QueryBuilder implements QueryBuilderInterface {
 	 * @param mixed $val
 	 * @param string $in - The (not) in fragment
 	 * @param string $conj - The where in conjunction
-	 * @return self
+	 * @return QueryBuilderInterface
 	 */
-	protected function _whereIn($key, $val=[], string $in='IN', string $conj='AND'): self
+	protected function _whereIn($key, $val=[], string $in='IN', string $conj='AND'): QueryBuilderInterface
 	{
 		$key = $this->driver->quoteIdent($key);
 		$params = array_fill(0, count($val), '?');
@@ -1166,6 +1213,7 @@ class QueryBuilder implements QueryBuilderInterface {
 				? htmlentities($this->driver->quote($v), ENT_NOQUOTES, 'utf-8')
 				: $v;
 		}
+		unset($v);
 
 		// Add the query onto the array of values to pass
 		// as arguments to sprintf
diff --git a/src/QueryBuilderInterface.php b/src/QueryBuilderInterface.php
index 01e5c25..9fe70c8 100644
--- a/src/QueryBuilderInterface.php
+++ b/src/QueryBuilderInterface.php
@@ -14,10 +14,46 @@
  */
 namespace Query;
 
+use PDO;
 use PDOStatement;
 
 /**
  * Interface defining the Query Builder class
+ *
+ * @method affectedRows(): int
+ * @method beginTransaction(): bool
+ * @method commit(): bool
+ * @method errorCode(): string
+ * @method errorInfo(): array
+ * @method exec(string $statement): int
+ * @method getAttribute(int $attribute)
+ * @method getColumns(string $table): array | null
+ * @method getDbs(): array | null
+ * @method getFks(string $table): array | null
+ * @method getFunctions(): array | null
+ * @method getIndexes(string $table): array | null
+ * @method getLastQuery(): string
+ * @method getProcedures(): array | null
+ * @method getSchemas(): array | null
+ * @method getSequences(): array | null
+ * @method getSystemTables(): array | null
+ * @method getTables(): array
+ * @method getTriggers(): array | null
+ * @method getTypes(): array | null
+ * @method getUtil(): \Query\Drivers\AbstractUtil
+ * @method getViews(): array | null
+ * @method inTransaction(): bool
+ * @method lastInsertId(string $name = NULL): string
+ * @method numRows(): int | null
+ * @method prepare(string $statement, array $driver_options = []): PDOStatement
+ * @method prepareExecute(string $sql, array $params): PDOStatement
+ * @method prepareQuery(string $sql, array $data): PDOStatement
+ * @method query(string $statement): PDOStatement
+ * @method quote(string $string, int $parameter_type = PDO::PARAM_STR): string
+ * @method rollback(): bool
+ * @method setAttribute(int $attribute, $value): bool
+ * @method setTablePrefix(string $prefix): void
+ * @method truncate(string $table): PDOStatement
  */
 interface QueryBuilderInterface {
 
@@ -29,67 +65,67 @@ interface QueryBuilderInterface {
 	 * Specifies rows to select in a query
 	 *
 	 * @param string $fields
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function select(string $fields): QueryBuilderInterface;
+	public function select(string $fields): self;
 
 	/**
 	 * Selects the maximum value of a field from a query
 	 *
 	 * @param string $field
 	 * @param string|bool $as
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function selectMax(string $field, $as=FALSE): QueryBuilderInterface;
+	public function selectMax(string $field, $as=FALSE): self;
 
 	/**
 	 * Selects the minimum value of a field from a query
 	 *
 	 * @param string $field
 	 * @param string|bool $as
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function selectMin(string $field, $as=FALSE): QueryBuilderInterface;
+	public function selectMin(string $field, $as=FALSE): self;
 
 	/**
 	 * Selects the average value of a field from a query
 	 *
 	 * @param string $field
 	 * @param string|bool $as
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function selectAvg(string $field, $as=FALSE): QueryBuilderInterface;
+	public function selectAvg(string $field, $as=FALSE): self;
 
 	/**
 	 * Selects the sum of a field from a query
 	 *
 	 * @param string $field
 	 * @param string|bool $as
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function selectSum(string $field, $as=FALSE): QueryBuilderInterface;
+	public function selectSum(string $field, $as=FALSE): self;
 
 	/**
 	 * Adds the 'distinct' keyword to a query
 	 *
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function distinct(): QueryBuilderInterface;
+	public function distinct(): self;
 
 	/**
 	 * Shows the query plan for the query
 	 *
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function explain(): QueryBuilderInterface;
+	public function explain(): self;
 
 	/**
 	 * Specify the database table to select from
 	 *
 	 * @param string $tblname
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function from(string $tblname): QueryBuilderInterface;
+	public function from(string $tblname): self;
 
 	// --------------------------------------------------------------------------
 	// ! 'Like' methods
@@ -101,9 +137,9 @@ interface QueryBuilderInterface {
 	 * @param string $field
 	 * @param mixed $values
 	 * @param string $pos
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function like(string $field, $values, string $pos='both'): QueryBuilderInterface;
+	public function like(string $field, $values, string $pos='both'): self;
 
 	/**
 	 * Generates an OR Like clause
@@ -111,9 +147,9 @@ interface QueryBuilderInterface {
 	 * @param string $field
 	 * @param mixed $values
 	 * @param string $pos
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function orLike(string $field, $values, string $pos='both'): QueryBuilderInterface;
+	public function orLike(string $field, $values, string $pos='both'): self;
 
 	/**
 	 * Generates a NOT LIKE clause
@@ -121,9 +157,9 @@ interface QueryBuilderInterface {
 	 * @param string $field
 	 * @param mixed $values
 	 * @param string $pos
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function notLike(string $field, $values, string $pos='both'): QueryBuilderInterface;
+	public function notLike(string $field, $values, string $pos='both'): self;
 
 	/**
 	 * Generates a OR NOT LIKE clause
@@ -131,9 +167,9 @@ interface QueryBuilderInterface {
 	 * @param string $field
 	 * @param mixed $values
 	 * @param string $pos
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function orNotLike(string $field, $values, string $pos='both'): QueryBuilderInterface;
+	public function orNotLike(string $field, $values, string $pos='both'): self;
 
 	// --------------------------------------------------------------------------
 	// ! Having methods
@@ -144,18 +180,18 @@ interface QueryBuilderInterface {
 	 *
 	 * @param mixed $key
 	 * @param mixed $values
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function having($key, $values=[]): QueryBuilderInterface;
+	public function having($key, $values=[]): self;
 
 	/**
 	 * Generates a 'Having' clause prefixed with 'OR'
 	 *
 	 * @param mixed $key
 	 * @param mixed $values
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function orHaving($key, $values=[]): QueryBuilderInterface;
+	public function orHaving($key, $values=[]): self;
 
 	// --------------------------------------------------------------------------
 	// ! 'Where' methods
@@ -169,54 +205,54 @@ interface QueryBuilderInterface {
 	 * @param mixed $key
 	 * @param mixed $values
 	 * @param bool $escape
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function where($key, $values=[], $escape = NULL): QueryBuilderInterface;
+	public function where($key, $values=[], $escape = NULL): self;
 
 	/**
 	 * Where clause prefixed with "OR"
 	 *
 	 * @param string $key
 	 * @param mixed $values
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function orWhere($key, $values=[]): QueryBuilderInterface;
+	public function orWhere($key, $values=[]): self;
 
 	/**
 	 * Where clause with 'IN' statement
 	 *
 	 * @param mixed $field
 	 * @param mixed $values
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function whereIn($field, $values=[]): QueryBuilderInterface;
+	public function whereIn($field, $values=[]): self;
 
 	/**
 	 * Where in statement prefixed with "or"
 	 *
 	 * @param string $field
 	 * @param mixed $values
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function orWhereIn($field, $values=[]): QueryBuilderInterface;
+	public function orWhereIn($field, $values=[]): self;
 
 	/**
 	 * WHERE NOT IN (FOO) clause
 	 *
 	 * @param string $field
 	 * @param mixed $values
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function whereNotIn($field, $values=[]): QueryBuilderInterface;
+	public function whereNotIn($field, $values=[]): self;
 
 	/**
 	 * OR WHERE NOT IN (FOO) clause
 	 *
 	 * @param string $field
 	 * @param mixed $values
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function orWhereNotIn($field, $values=[]): QueryBuilderInterface;
+	public function orWhereNotIn($field, $values=[]): self;
 
 	// --------------------------------------------------------------------------
 	// ! Other Query Modifier methods
@@ -227,9 +263,9 @@ interface QueryBuilderInterface {
 	 *
 	 * @param mixed $key
 	 * @param mixed $values
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function set($key, $values = NULL): QueryBuilderInterface;
+	public function set($key, $values = NULL): self;
 
 	/**
 	 * Creates a join phrase in a compiled query
@@ -237,35 +273,35 @@ interface QueryBuilderInterface {
 	 * @param string $table
 	 * @param string $condition
 	 * @param string $type
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function join(string $table, string $condition, string $type=''): QueryBuilderInterface;
+	public function join(string $table, string $condition, string $type=''): self;
 
 	/**
 	 * Group the results by the selected field(s)
 	 *
 	 * @param mixed $field
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function groupBy($field): QueryBuilderInterface;
+	public function groupBy($field): self;
 
 	/**
 	 * Order the results by the selected field(s)
 	 *
 	 * @param string $field
 	 * @param string $type
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function orderBy(string $field, string $type=''): QueryBuilderInterface;
+	public function orderBy(string $field, string $type=''): self;
 
 	/**
 	 * Set a limit on the current sql statement
 	 *
 	 * @param int $limit
 	 * @param int|bool $offset
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function limit(int $limit, $offset=FALSE): QueryBuilderInterface;
+	public function limit(int $limit, $offset=FALSE): self;
 
 	// --------------------------------------------------------------------------
 	// ! Query Grouping Methods
@@ -274,40 +310,40 @@ interface QueryBuilderInterface {
 	/**
 	 * Adds a paren to the current query for query grouping
 	 *
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function groupStart(): QueryBuilderInterface;
+	public function groupStart(): self;
 
 	/**
 	 * Adds a paren to the current query for query grouping,
 	 * prefixed with 'NOT'
 	 *
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function notGroupStart(): QueryBuilderInterface;
+	public function notGroupStart(): self;
 
 	/**
 	 * Adds a paren to the current query for query grouping,
 	 * prefixed with 'OR'
 	 *
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function orGroupStart(): QueryBuilderInterface;
+	public function orGroupStart(): self;
 
 	/**
 	 * Adds a paren to the current query for query grouping,
 	 * prefixed with 'OR NOT'
 	 *
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function orNotGroupStart(): QueryBuilderInterface;
+	public function orNotGroupStart(): self;
 
 	/**
 	 * Ends a query group
 	 *
-	 * @return QueryBuilderInterface
+	 * @return self
 	 */
-	public function groupEnd(): QueryBuilderInterface;
+	public function groupEnd(): self;
 
 	// --------------------------------------------------------------------------
 	// ! Query execution methods
diff --git a/src/common.php b/src/common.php
index 1dcb5f5..146e11d 100644
--- a/src/common.php
+++ b/src/common.php
@@ -13,129 +13,132 @@
  * @link		https://git.timshomepage.net/aviat4ion/Query
  */
 
-use Query\{
-	ConnectionManager,
-	QueryBuilderInterface
-};
+namespace {
 
-/**
- * Global functions that don't really fit anywhere else
- */
+	use Query\{
+		ConnectionManager,
+		QueryBuilderInterface
+	};
 
-/**
- * Multibyte-safe trim function
- *
- * @param string $string
- * @return string
- */
-function mb_trim(string $string): string
-{
-	return preg_replace('/(^\s+)|(\s+$)/u', '', $string);
-}
+	/**
+	 * Global functions that don't really fit anywhere else
+	 */
 
-/**
- * Filter out db rows into one array
- *
- * @param array $array
- * @param mixed $index
- * @return array
- */
-function dbFilter(array $array, $index): array
-{
-	$newArray = [];
-
-	foreach($array as $a)
+	/**
+	 * Multibyte-safe trim function
+	 *
+	 * @param string $string
+	 * @return string
+	 */
+	function mb_trim(string $string): string
 	{
-		$newArray[] = $a[$index];
+		return preg_replace('/(^\s+)|(\s+$)/u', '', $string);
 	}
 
-	return $newArray;
-}
-
-/**
- * Zip a set of arrays together on common keys
- *
- * The $zipperInput array is an array of arrays indexed by their place in the output
- * array.
- *
- * @param array $zipperInput
- * @return array
- */
-function arrayZipper(array $zipperInput): array
-{
-	$output = [];
-
-	foreach($zipperInput as $appendKey => $values)
+	/**
+	 * Filter out db rows into one array
+	 *
+	 * @param array $array
+	 * @param mixed $index
+	 * @return array
+	 */
+	function dbFilter(array $array, $index): array
 	{
-		foreach($values as $index => $value)
+		$newArray = [];
+
+		foreach ($array as $a)
 		{
-			if ( ! isset($output[$index]))
-			{
-				$output[$index] = [];
-			}
-			$output[$index][$appendKey] = $value;
+			$newArray[] = $a[$index];
 		}
+
+		return $newArray;
 	}
 
-	return $output;
-}
-
-/**
- * Determine whether a value in the passed array matches the pattern
- * passed
- *
- * @param array $array
- * @param string $pattern
- * @return bool
- */
-function regexInArray(array $array, string $pattern): bool
-{
-	if (empty($array))
+	/**
+	 * Zip a set of arrays together on common keys
+	 *
+	 * The $zipperInput array is an array of arrays indexed by their place in the output
+	 * array.
+	 *
+	 * @param array $zipperInput
+	 * @return array
+	 */
+	function arrayZipper(array $zipperInput): array
 	{
+		$output = [];
+
+		foreach ($zipperInput as $appendKey => $values)
+		{
+			foreach ($values as $index => $value)
+			{
+				if ( ! isset($output[$index]))
+				{
+					$output[$index] = [];
+				}
+				$output[$index][$appendKey] = $value;
+			}
+		}
+
+		return $output;
+	}
+
+	/**
+	 * Determine whether a value in the passed array matches the pattern
+	 * passed
+	 *
+	 * @param array $array
+	 * @param string $pattern
+	 * @return bool
+	 */
+	function regexInArray(array $array, string $pattern): bool
+	{
+		if (empty($array))
+		{
+			return FALSE;
+		}
+
+		foreach ($array as $item)
+		{
+			if (is_scalar($item) && preg_match($pattern, $item))
+			{
+				return TRUE;
+			}
+		}
+
 		return FALSE;
 	}
 
-	foreach($array as $item)
+	/**
+	 * Connection function
+	 *
+	 * Send an array or object as connection parameters to create a connection. If
+	 * the array or object has an 'alias' parameter, passing that string to this
+	 * function will return that connection. Passing no parameters returns the last
+	 * connection created.
+	 *
+	 * @param string|object|array $params
+	 * @return QueryBuilderInterface|null
+	 */
+	function Query($params = ''): ?QueryBuilderInterface
 	{
-		if (is_scalar($item) && preg_match($pattern, $item))
+		if ($params === NULL)
 		{
-			return TRUE;
+			return NULL;
 		}
+
+		$manager = ConnectionManager::getInstance();
+
+		// If you are getting a previously created connection
+		if (is_scalar($params))
+		{
+			return $manager->getConnection($params);
+		}
+
+		$paramsObject = (object)$params;
+
+		// Otherwise, return a new connection
+		return $manager->connect($paramsObject);
 	}
 
-	return FALSE;
 }
-
-/**
- * Connection function
- *
- * Send an array or object as connection parameters to create a connection. If
- * the array or object has an 'alias' parameter, passing that string to this
- * function will return that connection. Passing no parameters returns the last
- * connection created.
- *
- * @param string|object|array $params
- * @return QueryBuilderInterface|null
- */
-function Query($params = ''): ?QueryBuilderInterface
-{
-	if ($params === NULL)
-	{
-		return NULL;
-	}
-
-	$manager = ConnectionManager::getInstance();
-
-	// If you are getting a previously created connection
-	if (is_scalar($params))
-	{
-		return $manager->getConnection($params);
-	}
-
-	$paramsObject = (object) $params;
-
-	// Otherwise, return a new connection
-	return $manager->connect($paramsObject);
-}
-
 // End of common.php