private void testUnsupportedOperations() throws Exception {
Connection conn = getConnection();
stat = conn.createStatement();
stat.execute("create table test(id int, c clob, b blob)");
stat.execute("insert into test values(1, 'x', x'00')");
ResultSet rs = stat.executeQuery("select * from test order by id");
rs.next();
Clob clob = rs.getClob(2);
byte[] data = IOUtils.readBytesAndClose(clob.getAsciiStream(), -1);
assertEquals("x", new String(data, "UTF-8"));
assertTrue(clob.toString().endsWith("'x'"));
clob.free();
assertTrue(clob.toString().endsWith("null"));
assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, clob).truncate(0);
assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, clob).setAsciiStream(1);
assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, clob).setString(1, "", 0, 1);
assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, clob).position("", 0);
assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, clob).position((Clob) null, 0);
assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, clob).getCharacterStream(1, 1);
Blob blob = rs.getBlob(3);
assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, blob).truncate(0);
assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, blob).setBytes(1, new byte[0], 0, 0);
assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, blob).position(new byte[1], 0);
assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, blob).position((Blob) null, 0);
assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, blob).getBinaryStream(1, 1);
assertTrue(blob.toString().endsWith("X'00'"));
blob.free();
assertTrue(blob.toString().endsWith("null"));
stat.execute("drop table test");
conn.close();
}
@Override
public void releaseResources() {
log.trace("Releasing JDBC resources");
for (Map.Entry<Statement, Set<ResultSet>> entry : xref.entrySet()) {
if (entry.getValue() != null) {
closeAll(entry.getValue());
}
close(entry.getKey());
}
xref.clear();
closeAll(unassociatedResultSets);
if (blobs != null) {
for (Blob blob : blobs) {
try {
blob.free();
} catch (SQLException e) {
log.debugf("Unable to free JDBC Blob reference [%s]", e.getMessage());
}
}
blobs.clear();
}
if (clobs != null) {
for (Clob clob : clobs) {
try {
clob.free();
} catch (SQLException e) {
log.debugf("Unable to free JDBC Clob reference [%s]", e.getMessage());
}
}
clobs.clear();
}
if (nclobs != null) {
for (NClob nclob : nclobs) {
try {
nclob.free();
} catch (SQLException e) {
log.debugf("Unable to free JDBC NClob reference [%s]", e.getMessage());
}
}
nclobs.clear();
}
}
public SerialBlob(final Blob other) throws SQLException {
InputStream is = null;
try {
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
is = other.getBinaryStream();
final byte[] buff = new byte[1024];
int len;
while ((len = is.read(buff)) > 0) {
baos.write(buff, 0, len);
}
data = baos.toByteArray();
other.free();
} catch (final IOException e) {
throw new SQLException("Can't retrieve contents of Blob", e.toString());
} finally {
StreamCloser.close(is);
}
}
private byte[] getBytes(Blob blob) throws SQLException {
if (blob == null) {
LOGGER.log(Level.FINEST, "BLOB handler called with null BLOB");
return new byte[0];
}
LOGGER.log(Level.FINEST, "BLOB handler called with BLOB of length {0}", blob.length());
byte[] bytes = blob.getBytes(1, (int) blob.length());
try {
blob.free();
} catch (SQLException e) {
LOGGER.log(Level.WARNING, "Error freeing the BLOB", e);
} catch (UnsupportedOperationException e) {
// Check for JDBC drivers that don't support this JDBC 4.0 method.
// This is an unusual exception to throw, but worth catching since
// it's a RuntimeException that will otherwise terminate the monitor.
LOGGER.log(Level.WARNING, "Error freeing the BLOB, try a newer JDBC 4.0 driver", e);
} catch (LinkageError e) {
// Check for JDBC drivers that were not compiled against Java 6.
LOGGER.log(Level.WARNING, "Error freeing the BLOB, try a newer JDBC 4.0 driver", e);
}
return bytes;
}
/**
* Gets the job configuration from the DDBB.
*
* @param jobId the job identification.
* @return the {@link eu.aliada.ckancreation.model.JobConfiguration} which contains the
* configuration of the job.
* @since 2.0
*/
public JobConfiguration getJobConfiguration(final Integer jobId) {
JobConfiguration jobConf = null;
int datasetId = -1;
int organisationId = -1;
try {
final Statement sta = getConnection().createStatement();
String sql = "SELECT * FROM ckancreation_job_instances WHERE job_id=" + jobId;
ResultSet resultSet = sta.executeQuery(sql);
jobConf = new JobConfiguration();
while (resultSet.next()) {
jobConf = new JobConfiguration();
jobConf.setId(jobId);
jobConf.setCkanApiURL(resultSet.getString("ckan_api_url"));
jobConf.setCkanApiKey(resultSet.getString("ckan_api_key"));
jobConf.setTmpDir(resultSet.getString("tmp_dir"));
jobConf.setStoreIp(resultSet.getString("store_ip"));
jobConf.setStoreSqlPort(resultSet.getInt("store_sql_port"));
jobConf.setSqlLogin(resultSet.getString("sql_login"));
jobConf.setSqlPassword(resultSet.getString("sql_password"));
jobConf.setIsqlCommandPath(resultSet.getString("isql_command_path"));
jobConf.setIsqlCommandsGraphDumpFilename(
resultSet.getString("isql_commands_file_graph_dump"));
jobConf.setVirtHttpServRoot(resultSet.getString("virtuoso_http_server_root"));
jobConf.setOntologyUri(resultSet.getString("aliada_ontology"));
jobConf.setOrgName(resultSet.getString("org_name"));
jobConf.setOrgTitle(resultSet.getString("org_name").toUpperCase());
jobConf.setOrgDescription(resultSet.getString("org_description"));
jobConf.setOrgHomePage(resultSet.getString("org_home_page"));
datasetId = resultSet.getInt("datasetId");
jobConf.setDatasetId(datasetId);
organisationId = resultSet.getInt("organisationId");
}
resultSet.close();
// Get dataset related information
sql = "SELECT * FROM dataset WHERE datasetId=" + datasetId;
resultSet = sta.executeQuery(sql);
while (resultSet.next()) {
jobConf.setDatasetAuthor(resultSet.getString("dataset_author"));
jobConf.setDatasetAuthorEmail(resultSet.getString("dataset_author_email"));
jobConf.setCkanDatasetName(resultSet.getString("ckan_dataset_name"));
jobConf.setDatasetDesc(resultSet.getString("dataset_desc"));
jobConf.setDatasetLongDesc(resultSet.getString("dataset_long_desc"));
jobConf.setDatasetSourceURL(resultSet.getString("dataset_source_url"));
jobConf.setSparqlEndpointUri(resultSet.getString("sparql_endpoint_uri"));
jobConf.setSparqlLogin(resultSet.getString("sparql_endpoint_login"));
jobConf.setSparqlPassword(resultSet.getString("sparql_endpoint_password"));
jobConf.setPublicSparqlEndpointUri(resultSet.getString("public_sparql_endpoint_uri"));
jobConf.setLicenseCKANId(resultSet.getString("license_ckan_id"));
jobConf.setLicenseURL(resultSet.getString("license_url"));
jobConf.setDomainName(resultSet.getString("domain_name"));
jobConf.setVirtualHost(resultSet.getString("virtual_host"));
jobConf.setUriIdPart(resultSet.getString("uri_id_part"));
jobConf.setUriDocPart(resultSet.getString("uri_doc_part"));
jobConf.setUriConceptPart(resultSet.getString("uri_concept_part"));
jobConf.setUriSetPart(resultSet.getString("uri_set_part"));
}
resultSet.close();
// Get subsets related information
sql = "SELECT * FROM subset WHERE datasetId=" + datasetId;
resultSet = sta.executeQuery(sql);
while (resultSet.next()) {
final Subset subset = new Subset();
subset.setUriConceptPart(resultSet.getString("uri_concept_part"));
subset.setDescription(resultSet.getString("subset_desc"));
subset.setGraph(resultSet.getString("graph_uri"));
subset.setLinksGraph(resultSet.getString("links_graph_uri"));
subset.setDescription(resultSet.getString("subset_desc"));
jobConf.setSubset(subset);
}
resultSet.close();
// Get organisation LOGO from BLOB object in organisation table
sql = "SELECT org_logo FROM organisation WHERE organisationId=" + organisationId;
resultSet = sta.executeQuery(sql);
if (resultSet.next() && resultSet.getBlob("org_logo") != null) {
final Blob logo = resultSet.getBlob("org_logo");
final int blobLength = (int) logo.length();
byte[] blobAsBytes = null;
blobAsBytes = logo.getBytes(1, blobLength);
// Compose initial logo file name
final String orgImagePathInit =
jobConf.getTmpDir()
+ File.separator
+ "orgLogo"
+ "_"
+ System.currentTimeMillis()
+ ".jpeg";
try {
final FileOutputStream fos = new FileOutputStream(orgImagePathInit);
fos.write(blobAsBytes);
fos.close();
jobConf.setOrgImagePath(orgImagePathInit);
} catch (IOException exception) {
LOGGER.error(MessageCatalog._00034_FILE_CREATION_FAILURE, exception, orgImagePathInit);
}
// release the blob and free up memory. (since JDBC 4.0)
logo.free();
}
resultSet.close();
sta.close();
} catch (SQLException exception) {
LOGGER.error(MessageCatalog._00024_DATA_ACCESS_FAILURE, exception);
return null;
}
return jobConf;
}
// 1 "BibTeX.id",
// 2 "BibTeX.createdBy",
// 3 "BibTeX.abstract",
// 4 "BibTeX.address",
// 5 "BibTeX.annotation",
// 6 "BibTeX.author",
// 7 "BibTeX.bibType",
// 8 "BibTeX.bookTitle",
// 9 "BibTeX.chapter",
// 10 "BibTeX.copyright",
// 11 "BibTeX.crossref",
// 12 "BibTeX.edition",
// 13 "BibTeX.editor",
// 14 "BibTeX.isbn",
// 15 "BibTeX.issn",
// 16 "BibTeX.journal",
// 17 "BibTeX.bibkey",
// 18 "BibTeX.keywords",
// 19 "BibTeX.number",
// 20 "BibTeX.pages",
// 21 "BibTeX.series",
// 22 "BibTeX.title",
// 23 "BibTeX.url",
// 24 "BibTeX.volume",
// 25 "BibTeX.year",
// 26 "uncompress(meta)"
@Override
public BibTeX next() throws DbException {
BibTeX nextBibTeX = new BibTeX();
try {
String bibtexId = rs.getString("id");
String createdBy = rs.getString("createdBy");
String abstractBib = rs.getString("abstract");
String address = rs.getString("address");
String annotation = rs.getString("annotation");
String author = rs.getString("author");
String bibType = rs.getString("bibType");
String bookTitle = rs.getString("bookTitle");
String chapter = rs.getString("chapter");
String copyright = rs.getString("copyright");
String crossref = rs.getString("crossref");
String edition = rs.getString("edition");
String editor = rs.getString("editor");
String isbn = rs.getString("isbn");
String issn = rs.getString("issn");
String journal = rs.getString("journal");
String bibkey = rs.getString("bibkey");
String keywords = rs.getString("keywords");
String pages = rs.getString("pages");
String series = rs.getString("series");
String title = rs.getString("title");
String url = rs.getString("url");
String number = rs.getString("number");
String volume = rs.getString("volume");
String year = rs.getString("year");
Blob metaInfoBlob = rs.getBlob(26);
if (metaInfoBlob != null) {
MetaInfoDeblobber mid = new MetaInfoDeblobber(metaInfoBlob);
MetaInfo mi = mid.toMetaInfo();
nextBibTeX.setMeta(mi);
metaInfoBlob.free();
}
nextBibTeX.setUri(new VRI(baseUri).augment(bibtexId));
nextBibTeX.setAbstract(abstractBib);
nextBibTeX.setAddress(address);
nextBibTeX.setAnnotation(annotation);
nextBibTeX.setAuthor(author);
BibTeX.BibTYPE bibTYPE = BibTeX.BibTYPE.Entry;
if (bibType != null) {
bibTYPE = BibTeX.BibTYPE.valueOf(bibType);
}
nextBibTeX.setBibType(bibTYPE);
nextBibTeX.setBookTitle(bookTitle);
nextBibTeX.setChapter(chapter);
nextBibTeX.setCopyright(copyright);
if (createdBy != null) {
User user = usersCache.get(createdBy); // try to get the user from the cache.
if (user == null) { // if user is not found in cache, create it and put it there!
user = new User();
user.setUid(createdBy);
if (resolveUser) {
FindUser fu = new FindUser();
fu.setWhere("uid='" + createdBy + "'");
IDbIterator<User> users = fu.list();
if (users.hasNext()) {
user = users.next();
}
users.close();
fu.close();
}
usersCache.put(createdBy, user);
}
nextBibTeX.setCreatedBy(user);
}
nextBibTeX.setCrossref(crossref);
nextBibTeX.setEdition(edition);
nextBibTeX.setEditor(editor);
nextBibTeX.setIsbn(isbn);
nextBibTeX.setIssn(issn);
nextBibTeX.setJournal(journal);
nextBibTeX.setKey(bibkey);
nextBibTeX.setKeywords(keywords);
if (number == null) {
nextBibTeX.setNumber(null);
} else {
nextBibTeX.setNumber(Integer.parseInt(number));
}
if (year == null) {
nextBibTeX.setYear(null);
} else {
nextBibTeX.setYear(Integer.parseInt(year));
}
if (volume == null) {
nextBibTeX.setVolume(null);
} else {
nextBibTeX.setVolume(Integer.parseInt(volume));
}
nextBibTeX.setPages(pages);
nextBibTeX.setSeries(series);
nextBibTeX.setTitle(title);
nextBibTeX.setUrl(url);
} catch (SQLException ex) {
final String msg = "SQL-related exception thrown while reading bibtex data from the database";
logger.warn(msg, ex);
throw new DbException(msg, ex);
}
return nextBibTeX;
}
/**
* @param rs
* @param interpretLiteralBytes
* @param payloadLength
* @return
* @throws HttpMalformedHeaderException
* @throws SQLException
* @throws DatabaseException
*/
private List<WebSocketMessageDTO> buildMessageDTOs(
ResultSet rs, boolean interpretLiteralBytes, int payloadLength)
throws SQLException, DatabaseException {
ArrayList<WebSocketMessageDTO> messages = new ArrayList<>();
try {
while (rs.next()) {
WebSocketMessageDTO message;
int channelId = rs.getInt("channel_id");
WebSocketChannelDTO channel = getChannel(channelId);
if (rs.getInt("fuzz_id") != 0) {
WebSocketFuzzMessageDTO fuzzMessage = new WebSocketFuzzMessageDTO(channel);
fuzzMessage.fuzzId = rs.getInt("fuzz_id");
fuzzMessage.state = WebSocketFuzzMessageDTO.State.valueOf(rs.getString("state"));
fuzzMessage.fuzz = rs.getString("fuzz");
message = fuzzMessage;
} else {
message = new WebSocketMessageDTO(channel);
}
message.id = rs.getInt("message_id");
message.setTime(rs.getTimestamp("timestamp"));
message.opcode = rs.getInt("opcode");
message.readableOpcode = WebSocketMessage.opcode2string(message.opcode);
// read payload
if (message.opcode == WebSocketMessage.OPCODE_BINARY) {
if (payloadLength == -1) {
// load all bytes
message.payload = rs.getBytes("payload_bytes");
} else {
Blob blob = rs.getBlob("payload_bytes");
int length = Math.min(payloadLength, (int) blob.length());
message.payload = blob.getBytes(1, length);
blob.free();
}
if (message.payload == null) {
message.payload = new byte[0];
}
} else {
if (payloadLength == -1) {
// load all characters
message.payload = rs.getString("payload_utf8");
} else {
Clob clob = rs.getClob("payload_utf8");
int length = Math.min(payloadLength, (int) clob.length());
message.payload = clob.getSubString(1, length);
clob.free();
}
if (message.payload == null) {
message.payload = "";
}
}
message.isOutgoing = rs.getBoolean("is_outgoing");
message.payloadLength = rs.getInt("payload_length");
messages.add(message);
}
} finally {
rs.close();
}
messages.trimToSize();
return messages;
}
public static Object parseType(ResultSet result, Integer i, int type)
throws SQLException, IOException, ParseException {
logger.trace("i={} type={}", i, type);
switch (type) {
/**
* The JDBC types CHAR, VARCHAR, and LONGVARCHAR are closely related. CHAR represents a
* small, fixed-length character string, VARCHAR represents a small, variable-length
* character string, and LONGVARCHAR represents a large, variable-length character string.
*/
case Types.CHAR:
case Types.VARCHAR:
case Types.LONGVARCHAR:
{
return result.getString(i);
}
case Types.NCHAR:
case Types.NVARCHAR:
case Types.LONGNVARCHAR:
{
return result.getNString(i);
}
/**
* The JDBC types BINARY, VARBINARY, and LONGVARBINARY are closely related. BINARY
* represents a small, fixed-length binary value, VARBINARY represents a small,
* variable-length binary value, and LONGVARBINARY represents a large, variable-length
* binary value
*/
case Types.BINARY:
case Types.VARBINARY:
case Types.LONGVARBINARY:
{
byte[] b = result.getBytes(i);
return b;
}
/**
* The JDBC type ARRAY represents the SQL3 type ARRAY.
*
* <p>An ARRAY value is mapped to an instance of the Array interface in the Java programming
* language. If a driver follows the standard implementation, an Array object logically
* points to an ARRAY value on the server rather than containing the elements of the ARRAY
* object, which can greatly increase efficiency. The Array interface contains methods for
* materializing the elements of the ARRAY object on the client in the form of either an
* array or a ResultSet object.
*/
case Types.ARRAY:
{
Array arr = result.getArray(i);
return arr == null ? null : arr.getArray();
}
/**
* The JDBC type BIGINT represents a 64-bit signed integer value between
* -9223372036854775808 and 9223372036854775807.
*
* <p>The corresponding SQL type BIGINT is a nonstandard extension to SQL. In practice the
* SQL BIGINT type is not yet currently implemented by any of the major databases, and we
* recommend that its use be avoided in code that is intended to be portable.
*
* <p>The recommended Java mapping for the BIGINT type is as a Java long.
*/
case Types.BIGINT:
{
Object o = result.getLong(i);
return result.wasNull() ? null : o;
}
/**
* The JDBC type BIT represents a single bit value that can be zero or one.
*
* <p>SQL-92 defines an SQL BIT type. However, unlike the JDBC BIT type, this SQL-92 BIT
* type can be used as a parameterized type to define a fixed-length binary string.
* Fortunately, SQL-92 also permits the use of the simple non-parameterized BIT type to
* represent a single binary digit, and this usage corresponds to the JDBC BIT type.
* Unfortunately, the SQL-92 BIT type is only required in "full" SQL-92 and is currently
* supported by only a subset of the major databases. Portable code may therefore prefer to
* use the JDBC SMALLINT type, which is widely supported.
*/
case Types.BIT:
{
try {
Object o = result.getInt(i);
return result.wasNull() ? null : o;
} catch (Exception e) {
String exceptionClassName = e.getClass().getName();
// postgresql can not handle boolean, it will throw PSQLException, something like "Bad
// value for type int : t"
if ("org.postgresql.util.PSQLException".equals(exceptionClassName)) {
return "t".equals(result.getString(i));
}
throw new IOException(e);
}
}
/**
* The JDBC type BOOLEAN, which is new in the JDBC 3.0 API, maps to a boolean in the Java
* programming language. It provides a representation of true and false, and therefore is a
* better match than the JDBC type BIT, which is either 1 or 0.
*/
case Types.BOOLEAN:
{
return result.getBoolean(i);
}
/**
* The JDBC type BLOB represents an SQL3 BLOB (Binary Large Object).
*
* <p>A JDBC BLOB value is mapped to an instance of the Blob interface in the Java
* programming language. If a driver follows the standard implementation, a Blob object
* logically points to the BLOB value on the server rather than containing its binary data,
* greatly improving efficiency. The Blob interface provides methods for materializing the
* BLOB data on the client when that is desired.
*/
case Types.BLOB:
{
Blob blob = result.getBlob(i);
if (blob != null) {
long n = blob.length();
if (n > Integer.MAX_VALUE) {
throw new IOException("can't process blob larger than Integer.MAX_VALUE");
}
byte[] tab = blob.getBytes(1, (int) n);
blob.free();
return tab;
}
break;
}
/**
* The JDBC type CLOB represents the SQL3 type CLOB (Character Large Object).
*
* <p>A JDBC CLOB value is mapped to an instance of the Clob interface in the Java
* programming language. If a driver follows the standard implementation, a Clob object
* logically points to the CLOB value on the server rather than containing its character
* data, greatly improving efficiency. Two of the methods on the Clob interface materialize
* the data of a CLOB object on the client.
*/
case Types.CLOB:
{
Clob clob = result.getClob(i);
if (clob != null) {
long n = clob.length();
if (n > Integer.MAX_VALUE) {
throw new IOException("can't process clob larger than Integer.MAX_VALUE");
}
String str = clob.getSubString(1, (int) n);
clob.free();
return str;
}
break;
}
case Types.NCLOB:
{
NClob nclob = result.getNClob(i);
if (nclob != null) {
long n = nclob.length();
if (n > Integer.MAX_VALUE) {
throw new IOException("can't process nclob larger than Integer.MAX_VALUE");
}
String str = nclob.getSubString(1, (int) n);
nclob.free();
return str;
}
break;
}
/**
* The JDBC type DATALINK, new in the JDBC 3.0 API, is a column value that references a file
* that is outside of a data source but is managed by the data source. It maps to the Java
* type java.net.URL and provides a way to manage external files. For instance, if the data
* source is a DBMS, the concurrency controls it enforces on its own data can be applied to
* the external file as well.
*
* <p>A DATALINK value is retrieved from a ResultSet object with the ResultSet methods
* getURL or getObject. If the Java platform does not support the type of URL returned by
* getURL or getObject, a DATALINK value can be retrieved as a String object with the method
* getString.
*
* <p>java.net.URL values are stored in a database using the method setURL. If the Java
* platform does not support the type of URL being set, the method setString can be used
* instead.
*/
case Types.DATALINK:
{
return result.getURL(i);
}
/**
* The JDBC DATE type represents a date consisting of day, month, and year. The
* corresponding SQL DATE type is defined in SQL-92, but it is implemented by only a subset
* of the major databases. Some databases offer alternative SQL types that support similar
* semantics.
*/
case Types.DATE:
{
try {
Date d = result.getDate(i, calendar);
return d != null ? formatDate(d.getTime()) : null;
} catch (SQLException e) {
return null;
}
}
case Types.TIME:
{
try {
Time t = result.getTime(i, calendar);
return t != null ? formatDate(t.getTime()) : null;
} catch (SQLException e) {
return null;
}
}
case Types.TIMESTAMP:
{
try {
Timestamp t = result.getTimestamp(i, calendar);
return t != null ? formatDate(t.getTime()) : null;
} catch (SQLException e) {
// java.sql.SQLException: Cannot convert value '0000-00-00 00:00:00' from column ... to
// TIMESTAMP.
return null;
}
}
/**
* The JDBC types DECIMAL and NUMERIC are very similar. They both represent fixed-precision
* decimal values.
*
* <p>The corresponding SQL types DECIMAL and NUMERIC are defined in SQL-92 and are very
* widely implemented. These SQL types take precision and scale parameters. The precision is
* the total number of decimal digits supported, and the scale is the number of decimal
* digits after the decimal point. For most DBMSs, the scale is less than or equal to the
* precision. So for example, the value "12.345" has a precision of 5 and a scale of 3, and
* the value ".11" has a precision of 2 and a scale of 2. JDBC requires that all DECIMAL and
* NUMERIC types support both a precision and a scale of at least 15.
*
* <p>The sole distinction between DECIMAL and NUMERIC is that the SQL-92 specification
* requires that NUMERIC types be represented with exactly the specified precision, whereas
* for DECIMAL types, it allows an implementation to add additional precision beyond that
* specified when the type was created. Thus a column created with type NUMERIC(12,4) will
* always be represented with exactly 12 digits, whereas a column created with type
* DECIMAL(12,4) might be represented by some larger number of digits.
*
* <p>The recommended Java mapping for the DECIMAL and NUMERIC types is
* java.math.BigDecimal. The java.math.BigDecimal type provides math operations to allow
* BigDecimal types to be added, subtracted, multiplied, and divided with other BigDecimal
* types, with integer types, and with floating point types.
*
* <p>The method recommended for retrieving DECIMAL and NUMERIC values is
* ResultSet.getBigDecimal. JDBC also allows access to these SQL types as simple Strings or
* arrays of char. Thus, Java programmers can use getString to receive a DECIMAL or NUMERIC
* result. However, this makes the common case where DECIMAL or NUMERIC are used for
* currency values rather awkward, since it means that application writers have to perform
* math on strings. It is also possible to retrieve these SQL types as any of the Java
* numeric types.
*/
case Types.DECIMAL:
case Types.NUMERIC:
{
BigDecimal bd = null;
try {
// getBigDecimal() should get obsolete. Most seem to use getString/getObject anyway...
bd = result.getBigDecimal(i);
} catch (NullPointerException e) {
// But is it true? JDBC NPE exists since 13 years?
// http://forums.codeguru.com/archive/index.php/t-32443.html
// Null values are driving us nuts in JDBC:
// http://stackoverflow.com/questions/2777214/when-accessing-resultsets-in-jdbc-is-there-an-elegant-way-to-distinguish-betwee
}
if (bd == null || result.wasNull()) {
return null;
}
int scale = 2;
if (scale >= 0) {
bd = bd.setScale(scale, BigDecimal.ROUND_UP);
try {
long l = bd.longValueExact();
if (Long.toString(l).equals(result.getString(i))) {
// convert to long if possible
return l;
} else {
// convert to double (with precision loss)
return bd.doubleValue();
}
} catch (ArithmeticException e) {
return bd.doubleValue();
}
} else {
return bd.toPlainString();
}
}
/**
* The JDBC type DOUBLE represents a "double precision" floating point number that supports
* 15 digits of mantissa.
*
* <p>The corresponding SQL type is DOUBLE PRECISION, which is defined in SQL-92 and is
* widely supported by the major databases. The SQL-92 standard leaves the precision of
* DOUBLE PRECISION up to the implementation, but in practice all the major databases
* supporting DOUBLE PRECISION support a mantissa precision of at least 15 digits.
*
* <p>The recommended Java mapping for the DOUBLE type is as a Java double.
*/
case Types.DOUBLE:
{
String s = result.getString(i);
if (result.wasNull() || s == null) {
return null;
}
NumberFormat format = NumberFormat.getInstance(locale);
Number number = format.parse(s);
return number.doubleValue();
}
/**
* The JDBC type FLOAT is basically equivalent to the JDBC type DOUBLE. We provided both
* FLOAT and DOUBLE in a possibly misguided attempt at consistency with previous database
* APIs. FLOAT represents a "double precision" floating point number that supports 15 digits
* of mantissa.
*
* <p>The corresponding SQL type FLOAT is defined in SQL-92. The SQL-92 standard leaves the
* precision of FLOAT up to the implementation, but in practice all the major databases
* supporting FLOAT support a mantissa precision of at least 15 digits.
*
* <p>The recommended Java mapping for the FLOAT type is as a Java double. However, because
* of the potential confusion between the double precision SQL FLOAT and the single
* precision Java float, we recommend that JDBC programmers should normally use the JDBC
* DOUBLE type in preference to FLOAT.
*/
case Types.FLOAT:
{
String s = result.getString(i);
if (result.wasNull() || s == null) {
return null;
}
NumberFormat format = NumberFormat.getInstance(locale);
Number number = format.parse(s);
return number.doubleValue();
}
/**
* The JDBC type JAVA_OBJECT, added in the JDBC 2.0 core API, makes it easier to use objects
* in the Java programming language as values in a database. JAVA_OBJECT is simply a type
* code for an instance of a class defined in the Java programming language that is stored
* as a database object. The type JAVA_OBJECT is used by a database whose type system has
* been extended so that it can store Java objects directly. The JAVA_OBJECT value may be
* stored as a serialized Java object, or it may be stored in some vendor-specific format.
*
* <p>The type JAVA_OBJECT is one of the possible values for the column DATA_TYPE in the
* ResultSet objects returned by various DatabaseMetaData methods, including getTypeInfo,
* getColumns, and getUDTs. The method getUDTs, part of the new JDBC 2.0 core API, will
* return information about the Java objects contained in a particular schema when it is
* given the appropriate parameters. Having this information available facilitates using a
* Java class as a database type.
*/
case Types.OTHER:
case Types.JAVA_OBJECT:
{
return result.getObject(i);
}
/**
* The JDBC type REAL represents a "single precision" floating point number that supports
* seven digits of mantissa.
*
* <p>The corresponding SQL type REAL is defined in SQL-92 and is widely, though not
* universally, supported by the major databases. The SQL-92 standard leaves the precision
* of REAL up to the implementation, but in practice all the major databases supporting REAL
* support a mantissa precision of at least seven digits.
*
* <p>The recommended Java mapping for the REAL type is as a Java float.
*/
case Types.REAL:
{
String s = result.getString(i);
if (result.wasNull() || s == null) {
return null;
}
NumberFormat format = NumberFormat.getInstance(locale);
Number number = format.parse(s);
return number.doubleValue();
}
/**
* The JDBC type TINYINT represents an 8-bit integer value between 0 and 255 that may be
* signed or unsigned.
*
* <p>The corresponding SQL type, TINYINT, is currently supported by only a subset of the
* major databases. Portable code may therefore prefer to use the JDBC SMALLINT type, which
* is widely supported.
*
* <p>The recommended Java mapping for the JDBC TINYINT type is as either a Java byte or a
* Java short. The 8-bit Java byte type represents a signed value from -128 to 127, so it
* may not always be appropriate for larger TINYINT values, whereas the 16-bit Java short
* will always be able to hold all TINYINT values.
*/
/**
* The JDBC type SMALLINT represents a 16-bit signed integer value between -32768 and 32767.
*
* <p>The corresponding SQL type, SMALLINT, is defined in SQL-92 and is supported by all the
* major databases. The SQL-92 standard leaves the precision of SMALLINT up to the
* implementation, but in practice, all the major databases support at least 16 bits.
*
* <p>The recommended Java mapping for the JDBC SMALLINT type is as a Java short.
*/
/**
* The JDBC type INTEGER represents a 32-bit signed integer value ranging between
* -2147483648 and 2147483647.
*
* <p>The corresponding SQL type, INTEGER, is defined in SQL-92 and is widely supported by
* all the major databases. The SQL-92 standard leaves the precision of INTEGER up to the
* implementation, but in practice all the major databases support at least 32 bits.
*
* <p>The recommended Java mapping for the INTEGER type is as a Java int.
*/
case Types.TINYINT:
case Types.SMALLINT:
case Types.INTEGER:
{
try {
Integer integer = result.getInt(i);
return result.wasNull() ? null : integer;
} catch (SQLDataException e) {
Long l = result.getLong(i);
return result.wasNull() ? null : l;
}
}
case Types.SQLXML:
{
SQLXML xml = result.getSQLXML(i);
return xml != null ? xml.getString() : null;
}
case Types.NULL:
{
return null;
}
/**
* The JDBC type DISTINCT field (Types class)>DISTINCT represents the SQL3 type DISTINCT.
*
* <p>The standard mapping for a DISTINCT type is to the Java type to which the base type of
* a DISTINCT object would be mapped. For example, a DISTINCT type based on a CHAR would be
* mapped to a String object, and a DISTINCT type based on an SQL INTEGER would be mapped to
* an int.
*
* <p>The DISTINCT type may optionally have a custom mapping to a class in the Java
* programming language. A custom mapping consists of a class that implements the interface
* SQLData and an entry in a java.util.Map object.
*/
case Types.DISTINCT:
{
logger.warn("JDBC type not implemented: {}", type);
return null;
}
/**
* The JDBC type STRUCT represents the SQL99 structured type. An SQL structured type, which
* is defined by a user with a CREATE TYPE statement, consists of one or more attributes.
* These attributes may be any SQL data type, built-in or user-defined.
*
* <p>The standard mapping for the SQL type STRUCT is to a Struct object in the Java
* programming language. A Struct object contains a value for each attribute of the STRUCT
* value it represents.
*
* <p>A STRUCT value may optionally be custom mapped to a class in the Java programming
* language, and each attribute in the STRUCT may be mapped to a field in the class. A
* custom mapping consists of a class that implements the interface SQLData and an entry in
* a java.util.Map object.
*/
case Types.STRUCT:
{
logger.warn("JDBC type not implemented: {}", type);
return null;
}
case Types.REF:
{
logger.warn("JDBC type not implemented: {}", type);
return null;
}
case Types.ROWID:
{
logger.warn("JDBC type not implemented: {}", type);
return null;
}
default:
{
logger.warn("unknown JDBC type ignored: {}", type);
return null;
}
}
return null;
}