Class SetExamQuestion

java.lang.Object

org.deltava.dao.DAO

org.deltava.dao.SetExamQuestion

public class SetExamQuestion
extends DAO

A Data Access Object to write Examination Question profiles to the database.

Since:

3.6

Version:

11.0

Author:

Luke

Field Summary

Fields inherited from class DAO

_queryMax, _queryStart, _queryTimeout, WGS84_SRID

Modifier and Type	Field	Description
protected int	_queryMax	The maximum number of rows to return.
protected int	_queryStart	The row number at which to start returning results.
protected int	_queryTimeout	The query timeout, in seconds.
protected static final int	WGS84_SRID	The SRID used for geolocation queries.

Constructor Summary

Constructors

Constructor	Description
SetExamQuestion(Connection c)	Initializes the Data Access Object.

Method Summary

Modifier and Type	Method	Description
void	clearImage(int id)	Deletes a Question Profile image resource from the database.
void	delete(QuestionProfile qp)	Deletes an Examination Question profile from the database.
void	write(QuestionProfile qp)	Writes an Examination Question Profile to the database.
void	writeExams(QuestionProfile qp)	Updates the Examinations that can use this Question.
void	writeImage(QuestionProfile qp)	Writes a Question Profile image resource to the database.

Methods inherited from class DAO

commitTransaction, createTimestamp, executeIDs, executeUpdate, executeUpdate, expandDate, formatDBName, formatLocation, getNewID, getQueryCount, prepare, prepareWithoutLimits, rollbackTransaction, setQueryMax, setQueryStart, setQueryTimeout, startTransaction, toID, toID, toInstant

Modifier and Type	Method	Description
protected void	commitTransaction()	Commits a multi-step transaction to the database.
protected static Timestamp	createTimestamp(Instant i)	Null-safe conversion of an Instant to a Timestamp.
protected static List<Integer>	executeIDs(PreparedStatement ps)	Helper method to extract database ID data from the result set.
protected static int	executeUpdate(PreparedStatement ps, int minUpdateCount)	Executes an UPDATE transaction on a prepared statement, and throws a SQLExceptionif less than the expected number of rows were updated.
protected static int	executeUpdate(PreparedStatement ps, int minPerUpdate, int minTotal)	Executes an batched UPDATE transaction on a prepared statement, and throws a SQLExceptionif less than the expected number of rows were updated per batch entry.
protected static Instant	expandDate(Date dt)	Converts a date-only JDBC value into a full timestamp.
protected static String	formatDBName(String db)	Formats a database name by converting to lowercase.
protected static String	formatLocation(GeoLocation loc)	Converts a geographic location into a MySQL WKT formatted point.
protected int	getNewID()	Returns the AUTO_INC column value generated by the previous JDBC transaction.
static final long	getQueryCount()	Returns the total number of queries executed since the JVM was started.
protected PreparedStatement	prepare(String sql)	Initialize the prepared statement with an arbitrary SQL statement.
protected PreparedStatement	prepareWithoutLimits(String sql)	Initialize the prepared statement with an abitrary SQL statement, without applying the DAO's query result limitations.
protected void	rollbackTransaction()	Rolls back a multi-step transaction before it is completed.
final void	setQueryMax(int maxRows)	Sets the maximum number of rows in the returned result set.
final void	setQueryStart(int rowStart)	Sets the first row of the results to return.
void	setQueryTimeout(int timeout)	Sets the timeout for any SQL operations.
protected void	startTransaction()	Marks the start of a multi-step database transaction.
protected static Integer	toID(Object o)	Converts a Database bean or an Integer into an Integer.
protected static Collection<Integer>	toID(Collection<?> ids)	Converts a collection of Objects into Integer IDs.
protected static Instant	toInstant(Timestamp dt)	Null-safe conversion of a Timestamp to an Instant.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

SetExamQuestion

public SetExamQuestion(Connection c)

Initializes the Data Access Object.

Parameters:

c - the JDBC connection to use

Method Details

write

public void write(QuestionProfile qp)
           throws DAOException

Writes an Examination Question Profile to the database. This call can handle both INSERT and UPDATE operations. If an INSERT operation is performed, the auto-assigned database ID will be set in the bean.

Parameters:

qp - the QuestionProfile bean to write

Throws:

DAOException - if a JDBC error occurs

writeExams

public void writeExams(QuestionProfile qp)
                throws DAOException

Updates the Examinations that can use this Question.

Parameters:

qp - the QuestionProfile bean

Throws:

DAOException - if a JDBC error occurs

writeImage

public void writeImage(QuestionProfile qp)
                throws DAOException

Writes a Question Profile image resource to the database.

Parameters:

qp - the QuestionProfile bean

Throws:

DAOException - if a JDBC error occurs

IllegalArgumentException - if the Image bean is not populated

clearImage

public void clearImage(int id)
                throws DAOException

Deletes a Question Profile image resource from the database.

Parameters:

id - the Question Profile database ID

Throws:

DAOException - if a JDBC error occurs

delete

public void delete(QuestionProfile qp)
            throws DAOException

Deletes an Examination Question profile from the database.

Parameters:

qp - the QuestionProfile bean

Throws:

DAOException - if a JDBC error occurs