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TeradataDialect.java
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TeradataDialect.java
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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.dialect;
import org.hibernate.LockOptions;
import org.hibernate.boot.Metadata;
import org.hibernate.boot.model.naming.Identifier;
import org.hibernate.boot.model.relational.QualifiedNameImpl;
import org.hibernate.boot.model.relational.QualifiedTableName;
import org.hibernate.cfg.Environment;
import org.hibernate.dialect.function.CommonFunctionFactory;
import org.hibernate.dialect.identity.IdentityColumnSupport;
import org.hibernate.dialect.identity.Teradata14IdentityColumnSupport;
import org.hibernate.dialect.pagination.LimitHandler;
import org.hibernate.dialect.pagination.TopLimitHandler;
import org.hibernate.engine.jdbc.dialect.spi.DialectResolutionInfo;
import org.hibernate.engine.jdbc.env.spi.JdbcEnvironment;
import org.hibernate.exception.spi.TemplatedViolatedConstraintNameExtractor;
import org.hibernate.exception.spi.ViolatedConstraintNameExtractor;
import org.hibernate.mapping.Column;
import org.hibernate.mapping.Index;
import org.hibernate.metamodel.mapping.EntityMappingType;
import org.hibernate.metamodel.spi.RuntimeModelCreationContext;
import org.hibernate.query.TemporalUnit;
import org.hibernate.query.spi.QueryEngine;
import org.hibernate.query.spi.QueryOptions;
import org.hibernate.query.sqm.mutation.internal.idtable.AfterUseAction;
import org.hibernate.query.sqm.mutation.internal.idtable.GlobalTemporaryTableStrategy;
import org.hibernate.query.sqm.mutation.internal.idtable.IdTable;
import org.hibernate.query.sqm.mutation.internal.idtable.TempIdTableExporter;
import org.hibernate.query.sqm.mutation.spi.SqmMultiTableMutationStrategy;
import org.hibernate.sql.ForUpdateFragment;
import org.hibernate.tool.schema.internal.StandardIndexExporter;
import org.hibernate.tool.schema.spi.Exporter;
import org.hibernate.type.StandardBasicTypes;
import java.sql.CallableStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.util.Iterator;
import java.util.Map;
import static org.hibernate.exception.spi.TemplatedViolatedConstraintNameExtractor.extractUsingTemplate;
/**
* A dialect for the Teradata database created by MCR as part of the
* dialect certification process.
*
* @author Jay Nance
*/
public class TeradataDialect extends Dialect {
private int version;
int getVersion() {
return version;
}
private static final int PARAM_LIST_SIZE_LIMIT = 1024;
public TeradataDialect(DialectResolutionInfo info) {
this( info.getDatabaseMajorVersion() );
}
public TeradataDialect() {
this(12);
}
public TeradataDialect(int version) {
super();
this.version = version;
registerColumnType( Types.BOOLEAN, "byteint" );
registerColumnType( Types.BIT, 1, "byteint" );
registerColumnType( Types.BIT, "byteint" );
registerColumnType( Types.TINYINT, "byteint" );
registerColumnType( Types.BINARY, "byte($l)" );
registerColumnType( Types.VARBINARY, "varbyte($l)" );
if ( getVersion() < 13 ) {
registerColumnType( Types.BIGINT, "numeric(19,0)" );
}
else {
//'bigint' has been there since at least version 13
registerColumnType( Types.BIGINT, "bigint" );
}
registerKeyword( "password" );
registerKeyword( "type" );
registerKeyword( "title" );
registerKeyword( "year" );
registerKeyword( "month" );
registerKeyword( "summary" );
registerKeyword( "alias" );
registerKeyword( "value" );
registerKeyword( "first" );
registerKeyword( "role" );
registerKeyword( "account" );
registerKeyword( "class" );
if ( getVersion() < 14 ) {
// use getBytes instead of getBinaryStream
getDefaultProperties().setProperty( Environment.USE_STREAMS_FOR_BINARY, "false" );
// no batch statements
getDefaultProperties().setProperty( Environment.STATEMENT_BATCH_SIZE, NO_BATCH );
}
else {
getDefaultProperties().setProperty( Environment.USE_STREAMS_FOR_BINARY, "true" );
getDefaultProperties().setProperty( Environment.STATEMENT_BATCH_SIZE, DEFAULT_BATCH_SIZE );
}
}
@Override
public int getPreferredSqlTypeCodeForBoolean() {
return Types.BIT;
}
@Override
public int getDefaultDecimalPrecision() {
return getVersion() < 14 ? 18 : 38;
}
@Override
public long getFractionalSecondPrecisionInNanos() {
// Do duration arithmetic in a seconds, but
// with the fractional part
return 1_000_000_000; //seconds!!
}
public String timestampdiffPattern(TemporalUnit unit, boolean fromTimestamp, boolean toTimestamp) {
StringBuilder pattern = new StringBuilder();
//TODO: TOTALLY UNTESTED CODE!
pattern.append("cast((?3 - ?2) ");
switch (unit) {
case NANOSECOND:
case NATIVE:
//default fractional precision is 6, the maximum
pattern.append("second");
break;
case WEEK:
pattern.append("day");
break;
case QUARTER:
pattern.append("month");
break;
default:
pattern.append( "?1" );
}
pattern.append("(4) as bigint)");
switch (unit) {
case WEEK:
pattern.append("/7");
break;
case QUARTER:
pattern.append("/3");
break;
case NANOSECOND:
pattern.append("*1e9");
break;
}
return pattern.toString();
}
@Override
public String timestampaddPattern(TemporalUnit unit, boolean timestamp) {
//TODO: TOTALLY UNTESTED CODE!
switch ( unit ) {
case NANOSECOND:
return "(?3 + (?2)/1e9 * interval '1' second)";
case NATIVE:
return "(?3 + (?2) * interval '1' second)";
case QUARTER:
return "(?3 + (?2) * interval '3' month)";
case WEEK:
return "(?3 + (?2) * interval '7' day)";
default:
return "(?3 + (?2) * interval '1' ?1)";
}
}
@Override
public void initializeFunctionRegistry(QueryEngine queryEngine) {
super.initializeFunctionRegistry( queryEngine );
CommonFunctionFactory.concat_pipeOperator( queryEngine );
CommonFunctionFactory.octetLength( queryEngine );
CommonFunctionFactory.moreHyperbolic( queryEngine );
CommonFunctionFactory.instr( queryEngine );
CommonFunctionFactory.substr( queryEngine );
CommonFunctionFactory.substring_substr( queryEngine );
//also natively supports ANSI-style substring()
CommonFunctionFactory.position( queryEngine );
queryEngine.getSqmFunctionRegistry().patternDescriptorBuilder( "mod", "(?1 mod ?2)" )
.setInvariantType( StandardBasicTypes.STRING )
.setExactArgumentCount( 2 )
.register();
if ( getVersion() >= 14 ) {
//list actually taken from Teradata 15 docs
CommonFunctionFactory.lastDay( queryEngine );
CommonFunctionFactory.initcap( queryEngine );
CommonFunctionFactory.trim2( queryEngine );
CommonFunctionFactory.soundex( queryEngine );
CommonFunctionFactory.ascii( queryEngine );
CommonFunctionFactory.char_chr( queryEngine );
CommonFunctionFactory.trunc( queryEngine );
CommonFunctionFactory.moreHyperbolic( queryEngine );
CommonFunctionFactory.monthsBetween( queryEngine );
CommonFunctionFactory.addMonths( queryEngine );
CommonFunctionFactory.stddevPopSamp( queryEngine );
CommonFunctionFactory.varPopSamp( queryEngine );
}
}
/**
* Does this dialect support the <tt>FOR UPDATE</tt> syntax?
*
* @return empty string ... Teradata does not support <tt>FOR UPDATE</tt> syntax
*/
@Override
public String getForUpdateString() {
return "";
}
@Override
public String getAddColumnString() {
return getVersion() < 14 ? super.getAddColumnString() : "add";
}
@Override
public SqmMultiTableMutationStrategy getFallbackSqmMutationStrategy(
EntityMappingType rootEntityDescriptor,
RuntimeModelCreationContext runtimeModelCreationContext) {
return new GlobalTemporaryTableStrategy(
new IdTable( rootEntityDescriptor, basename -> "HT_" + basename ),
() -> new TempIdTableExporter( false, this::getTypeName ) {
@Override
public String getCreateOptions() {
return "on commit preserve rows";
}
},
AfterUseAction.CLEAN,
runtimeModelCreationContext.getSessionFactory()
);
}
// @Override
// public String generateIdTableName(String baseName) {
// return IdTableSupportStandardImpl.INSTANCE.generateIdTableName( baseName );
// }
//
// @Override
// public String getCreateIdTableCommand() {
// return "create global temporary table";
// }
//
// @Override
// public String getCreateIdTableStatementOptions() {
// return " on commit preserve rows";
// }
//
// @Override
// public String getDropIdTableCommand() {
// return "drop table";
// }
//
// @Override
// public String getTruncateIdTableCommand() {
// return "delete from";
// }
@Override
public boolean supportsCascadeDelete() {
return false;
}
@Override
public boolean supportsCircularCascadeDeleteConstraints() {
return false;
}
@Override
public boolean supportsTupleDistinctCounts() {
return false;
}
@Override
public boolean supportsExistsInSelect() {
return false;
}
@Override
public boolean areStringComparisonsCaseInsensitive() {
return getVersion() < 14;
}
@Override
public boolean supportsEmptyInList() {
return false;
}
@Override
public String getSelectClauseNullString(int sqlType) {
String v = "null";
switch ( sqlType ) {
case Types.BIT:
case Types.TINYINT:
case Types.SMALLINT:
case Types.INTEGER:
case Types.BIGINT:
case Types.FLOAT:
case Types.REAL:
case Types.DOUBLE:
case Types.NUMERIC:
case Types.DECIMAL:
v = "cast(null as decimal)";
break;
case Types.CHAR:
case Types.VARCHAR:
case Types.LONGVARCHAR:
v = "cast(null as varchar(255))";
break;
case Types.DATE:
case Types.TIME:
case Types.TIMESTAMP:
case Types.TIMESTAMP_WITH_TIMEZONE:
v = "cast(null as timestamp)";
break;
case Types.BINARY:
case Types.VARBINARY:
case Types.LONGVARBINARY:
case Types.NULL:
case Types.OTHER:
case Types.JAVA_OBJECT:
case Types.DISTINCT:
case Types.STRUCT:
case Types.ARRAY:
case Types.BLOB:
case Types.CLOB:
case Types.REF:
case Types.DATALINK:
case Types.BOOLEAN:
break;
}
return v;
}
@Override
public boolean supportsUnboundedLobLocatorMaterialization() {
return false;
}
@Override
public String getCreateMultisetTableString() {
return "create multiset table ";
}
@Override
public boolean supportsLobValueChangePropagation() {
return false;
}
@Override
public boolean doesReadCommittedCauseWritersToBlockReaders() {
return true;
}
@Override
public boolean doesRepeatableReadCauseReadersToBlockWriters() {
return true;
}
@Override
public boolean supportsBindAsCallableArgument() {
return false;
}
@Override
public int getInExpressionCountLimit() {
return PARAM_LIST_SIZE_LIMIT;
}
@Override
public int registerResultSetOutParameter(CallableStatement statement, int col) throws SQLException {
statement.registerOutParameter( col, Types.REF );
col++;
return col;
}
@Override
public ResultSet getResultSet(CallableStatement cs) throws SQLException {
boolean isResultSet = cs.execute();
while ( !isResultSet && cs.getUpdateCount() != -1 ) {
isResultSet = cs.getMoreResults();
}
return cs.getResultSet();
}
@Override
public ViolatedConstraintNameExtractor getViolatedConstraintNameExtractor() {
return getVersion() < 14 ? super.getViolatedConstraintNameExtractor() : EXTRACTOR;
}
private static ViolatedConstraintNameExtractor EXTRACTOR =
new TemplatedViolatedConstraintNameExtractor( sqle -> {
String constraintName;
switch ( sqle.getErrorCode() ) {
case 27003:
constraintName = extractUsingTemplate( "Unique constraint (", ") violated.", sqle.getMessage() );
break;
case 2700:
constraintName = extractUsingTemplate( "Referential constraint", "violation:", sqle.getMessage() );
break;
case 5317:
constraintName = extractUsingTemplate( "Check constraint (", ") violated.", sqle.getMessage() );
break;
default:
return null;
}
if ( constraintName != null ) {
int i = constraintName.indexOf( '.' );
if ( i != -1 ) {
constraintName = constraintName.substring( i + 1 );
}
}
return constraintName;
} );
@Override
public boolean supportsLockTimeouts() {
return false;
}
@Override
public boolean useFollowOnLocking(String sql, QueryOptions queryOptions) {
return getVersion() >= 14;
}
@Override
public String getWriteLockString(int timeout) {
if ( getVersion() < 14 ) {
return super.getWriteLockString( timeout );
}
String sMsg = " Locking row for write ";
if ( timeout == LockOptions.NO_WAIT ) {
return sMsg + " nowait ";
}
return sMsg;
}
@Override
public String getReadLockString(int timeout) {
if ( getVersion() < 14 ) {
return super.getReadLockString( timeout );
}
String sMsg = " Locking row for read ";
if ( timeout == LockOptions.NO_WAIT ) {
return sMsg + " nowait ";
}
return sMsg;
}
@Override
public Exporter<Index> getIndexExporter() {
return new TeradataIndexExporter(this);
}
private static class TeradataIndexExporter extends StandardIndexExporter implements Exporter<Index> {
private TeradataIndexExporter(Dialect dialect) {
super(dialect);
}
@Override
public String[] getSqlCreateStrings(Index index, Metadata metadata) {
final JdbcEnvironment jdbcEnvironment = metadata.getDatabase().getJdbcEnvironment();
QualifiedTableName qualifiedTableName = index.getTable().getQualifiedTableName();
final String tableName = jdbcEnvironment.getQualifiedObjectNameFormatter().format(
qualifiedTableName,
jdbcEnvironment.getDialect()
);
final String indexNameForCreation;
if ( getDialect().qualifyIndexName() ) {
indexNameForCreation = jdbcEnvironment.getQualifiedObjectNameFormatter().format(
new QualifiedNameImpl(
qualifiedTableName.getCatalogName(),
qualifiedTableName.getSchemaName(),
Identifier.toIdentifier( index.getName() )
),
jdbcEnvironment.getDialect()
);
}
else {
indexNameForCreation = index.getName();
}
StringBuilder columnList = new StringBuilder();
boolean first = true;
for (Iterator<Column> column = index.getColumnIterator(); column.hasNext(); ) {
if ( first ) {
first = false;
}
else {
columnList.append( ", " );
}
columnList.append( column.next().getName() );
}
return new String[] {
"create index " + indexNameForCreation
+ "(" + columnList + ") on " + tableName
};
}
}
@Override
public IdentityColumnSupport getIdentityColumnSupport() {
return getVersion() < 14
? super.getIdentityColumnSupport()
: new Teradata14IdentityColumnSupport();
}
@Override
public String applyLocksToSql(String sql, LockOptions aliasedLockOptions, Map<String, String[]> keyColumnNames) {
return getVersion() < 14
? super.applyLocksToSql( sql, aliasedLockOptions, keyColumnNames )
: new ForUpdateFragment( this, aliasedLockOptions, keyColumnNames ).toFragmentString() + " " + sql;
}
@Override
public LimitHandler getLimitHandler() {
//TODO: is this right?!
return TopLimitHandler.INSTANCE;
}
}