org.batoo.jpa.core.impl.jdbc.dbutils

Class AbstractQueryRunner

java.lang.Object

org.batoo.jpa.core.impl.jdbc.dbutils.AbstractQueryRunner

Direct Known Subclasses:

QueryRunner

public abstract class AbstractQueryRunner
extends Object

The base class for QueryRunner & AsyncQueryRunner. This class is thread safe.

Since:

1.4 (mostly extracted from QueryRunner)

Field Summary

Fields

Modifier and Type	Field and Description
protected DataSource	ds The DataSource to retrieve connections from.

Constructor Summary

Constructors

Constructor and Description
AbstractQueryRunner() Default constructor, sets pmdKnownBroken to false and ds to null.
AbstractQueryRunner(boolean pmdKnownBroken) Constructor to allow workaround for Oracle drivers
AbstractQueryRunner(DataSource ds) Constructor to provide a DataSource.
AbstractQueryRunner(DataSource ds, boolean pmdKnownBroken) Constructor to allow workaround for Oracle drivers.

Method Summary

Methods

Modifier and Type	Method and Description
protected void	close(Connection conn) Close a Connection.
protected void	close(ResultSet rs) Close a ResultSet.
protected void	close(Statement stmt) Close a Statement.
void	fillStatement(PreparedStatement stmt, Object... params) Fill the PreparedStatement replacement parameters with the given objects.
DataSource	getDataSource() Returns the DataSource this runner is using.
boolean	isPmdKnownBroken() Oracle drivers don't support ParameterMetaData.getParameterType(int); if pmdKnownBroken is set to true, we won't even try it; if false, we'll try it, and if it breaks, we'll remember not to use it again.
protected Connection	prepareConnection() Factory method that creates and initializes a Connection object.
protected PreparedStatement	prepareStatement(Connection conn, String sql) Factory method that creates and initializes a PreparedStatement object for the given SQL.
protected void	rethrow(SQLException cause, String sql, Object... params) Throws a new exception with a more informative error message.
protected ResultSet	wrap(ResultSet rs) Wrap the ResultSet in a decorator before processing it.

Methods inherited from class java.lang.Object

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

Field Detail

ds

protected final DataSource ds

The DataSource to retrieve connections from.

Constructor Detail

AbstractQueryRunner

public AbstractQueryRunner()

Default constructor, sets pmdKnownBroken to false and ds to null.

AbstractQueryRunner

public AbstractQueryRunner(boolean pmdKnownBroken)

Constructor to allow workaround for Oracle drivers

Parameters:

pmdKnownBroken - Oracle drivers don't support ParameterMetaData.getParameterType(int); if pmdKnownBroken is set to true, we won't even try it; if false, we'll try it, and if it breaks, we'll remember not to use it again.

AbstractQueryRunner

public AbstractQueryRunner(DataSource ds)

Constructor to provide a DataSource. Methods that do not take a Connection parameter will retrieve connections from this DataSource.

Parameters:

ds - The DataSource to retrieve connections from.

AbstractQueryRunner

public AbstractQueryRunner(DataSource ds,
                   boolean pmdKnownBroken)

Constructor to allow workaround for Oracle drivers. Methods that do not take a Connection parameter will retrieve connections from this DataSource.

Parameters:

ds - The DataSource to retrieve connections from.

pmdKnownBroken - Oracle drivers don't support ParameterMetaData.getParameterType(int); if pmdKnownBroken is set to true, we won't even try it; if false, we'll try it, and if it breaks, we'll remember not to use it again.

Method Detail

close

protected void close(Connection conn)
              throws SQLException

Close a Connection. This implementation avoids closing if null and does not suppress any exceptions. Subclasses can override to provide special handling like logging.

Parameters:

conn - Connection to close

Throws:

SQLException - if a database access error occurs

Since:

DbUtils 1.1

close

protected void close(ResultSet rs)
              throws SQLException

Close a ResultSet. This implementation avoids closing if null and does not suppress any exceptions. Subclasses can override to provide special handling like logging.

Parameters:

rs - ResultSet to close

Throws:

SQLException - if a database access error occurs

Since:

DbUtils 1.1

close

protected void close(Statement stmt)
              throws SQLException

Close a Statement. This implementation avoids closing if null and does not suppress any exceptions. Subclasses can override to provide special handling like logging.

Parameters:

stmt - Statement to close

Throws:

SQLException - if a database access error occurs

Since:

DbUtils 1.1

fillStatement

public void fillStatement(PreparedStatement stmt,
                 Object... params)
                   throws SQLException

Fill the PreparedStatement replacement parameters with the given objects.

Parameters:

stmt - PreparedStatement to fill

params - Query replacement parameters; null is a valid value to pass in.

Throws:

SQLException - if a database access error occurs

getDataSource

public DataSource getDataSource()

Returns the DataSource this runner is using. QueryRunner methods always call this method to get the DataSource so subclasses can provide specialized behavior.

Returns:

DataSource the runner is using

isPmdKnownBroken

public boolean isPmdKnownBroken()

Oracle drivers don't support ParameterMetaData.getParameterType(int); if pmdKnownBroken is set to true, we won't even try it; if false, we'll try it, and if it breaks, we'll remember not to use it again.

Returns:

the flag to skip (or not) ParameterMetaData.getParameterType(int)

Since:

1.4

prepareConnection

protected Connection prepareConnection()
                                throws SQLException

Factory method that creates and initializes a Connection object. QueryRunner methods always call this method to retrieve connections from its DataSource. Subclasses can override this method to provide special Connection configuration if needed. This implementation simply calls ds.getConnection().

Returns:

An initialized Connection.

Throws:

SQLException - if a database access error occurs

Since:

DbUtils 1.1

prepareStatement

protected PreparedStatement prepareStatement(Connection conn,
                                 String sql)
                                      throws SQLException

Factory method that creates and initializes a PreparedStatement object for the given SQL. QueryRunner methods always call this method to prepare statements for them. Subclasses can override this method to provide special PreparedStatement configuration if needed. This implementation simply calls conn.prepareStatement(sql).

Parameters:

conn - The Connection used to create the PreparedStatement

sql - The SQL statement to prepare.

Returns:

An initialized PreparedStatement.

Throws:

SQLException - if a database access error occurs

rethrow

protected void rethrow(SQLException cause,
           String sql,
           Object... params)
                throws SQLException

Throws a new exception with a more informative error message.

Parameters:

cause - The original exception that will be chained to the new exception when it's rethrown.

sql - The query that was executing when the exception happened.

params - The query replacement parameters; null is a valid value to pass in.

Throws:

SQLException - if a database access error occurs

wrap

protected ResultSet wrap(ResultSet rs)

Wrap the ResultSet in a decorator before processing it. This implementation returns the ResultSet it is given without any decoration.

Often, the implementation of this method can be done in an anonymous inner class like this:

 QueryRunner run = new QueryRunner() {
        protected ResultSet wrap(ResultSet rs) {
                return StringTrimmedResultSet.wrap(rs);
        }
 };
 

Parameters:

rs - The ResultSet to decorate; never null.

Returns:

The ResultSet wrapped in some decorator.