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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 .
 */
package org.hibernate.dialect;

import java.sql.CallableStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.hibernate.JDBCException;
import org.hibernate.QueryTimeoutException;
import org.hibernate.cfg.Environment;
import org.hibernate.dialect.function.NoArgSQLFunction;
import org.hibernate.dialect.function.NvlFunction;
import org.hibernate.dialect.function.SQLFunctionTemplate;
import org.hibernate.dialect.function.StandardSQLFunction;
import org.hibernate.dialect.function.VarArgsSQLFunction;
import org.hibernate.dialect.pagination.AbstractLimitHandler;
import org.hibernate.dialect.pagination.LimitHandler;
import org.hibernate.dialect.pagination.LimitHelper;
import org.hibernate.engine.spi.QueryParameters;
import org.hibernate.engine.spi.RowSelection;
import org.hibernate.exception.ConstraintViolationException;
import org.hibernate.exception.LockAcquisitionException;
import org.hibernate.exception.LockTimeoutException;
import org.hibernate.exception.spi.SQLExceptionConversionDelegate;
import org.hibernate.exception.spi.TemplatedViolatedConstraintNameExtracter;
import org.hibernate.exception.spi.ViolatedConstraintNameExtracter;
import org.hibernate.hql.spi.id.IdTableSupportStandardImpl;
import org.hibernate.hql.spi.id.MultiTableBulkIdStrategy;
import org.hibernate.hql.spi.id.global.GlobalTemporaryTableBulkIdStrategy;
import org.hibernate.hql.spi.id.local.AfterUseAction;
import org.hibernate.internal.util.JdbcExceptionHelper;
import org.hibernate.procedure.internal.StandardCallableStatementSupport;
import org.hibernate.procedure.spi.CallableStatementSupport;
import org.hibernate.sql.CaseFragment;
import org.hibernate.sql.DecodeCaseFragment;
import org.hibernate.sql.JoinFragment;
import org.hibernate.sql.OracleJoinFragment;
import org.hibernate.tool.schema.extract.internal.SequenceInformationExtractorOracleDatabaseImpl;
import org.hibernate.tool.schema.extract.spi.SequenceInformationExtractor;
import org.hibernate.type.StandardBasicTypes;
import org.hibernate.type.descriptor.sql.BitTypeDescriptor;
import org.hibernate.type.descriptor.sql.SqlTypeDescriptor;

/**
 * A dialect for Oracle 8i.
 *
 * @author Steve Ebersole
 */
@SuppressWarnings("deprecation")
public class Oracle8iDialect extends Dialect {

	private static final Pattern DISTINCT_KEYWORD_PATTERN = Pattern.compile( "\\bdistinct\\b" );

	private static final Pattern GROUP_BY_KEYWORD_PATTERN = Pattern.compile( "\\bgroup\\sby\\b" );

	private static final Pattern ORDER_BY_KEYWORD_PATTERN = Pattern.compile( "\\border\\sby\\b" );

	private static final Pattern UNION_KEYWORD_PATTERN = Pattern.compile( "\\bunion\\b" );

	private static final Pattern SQL_STATEMENT_TYPE_PATTERN = Pattern.compile("^(?:\\/\\*.*?\\*\\/)?\\s*(select|insert|update|delete)\\s+.*?", Pattern.CASE_INSENSITIVE);

	private static final AbstractLimitHandler LIMIT_HANDLER = new AbstractLimitHandler() {
		@Override
		public String processSql(String sql, RowSelection selection) {
			final boolean hasOffset = LimitHelper.hasFirstRow( selection );
			sql = sql.trim();
			boolean isForUpdate = false;
			if (sql.toLowerCase(Locale.ROOT).endsWith( " for update" )) {
				sql = sql.substring( 0, sql.length() - 11 );
				isForUpdate = true;
			}

			final StringBuilder pagingSelect = new StringBuilder( sql.length() + 100 );
			if (hasOffset) {
				pagingSelect.append( "select * from ( select row_.*, rownum rownum_ from ( " );
			}
			else {
				pagingSelect.append( "select * from ( " );
			}
			pagingSelect.append( sql );
			if (hasOffset) {
				pagingSelect.append( " ) row_ ) where rownum_ <= ? and rownum_ > ?" );
			}
			else {
				pagingSelect.append( " ) where rownum <= ?" );
			}

			if (isForUpdate) {
				pagingSelect.append( " for update" );
			}

			return pagingSelect.toString();
		}

		@Override
		public boolean supportsLimit() {
			return true;
		}

		@Override
		public boolean bindLimitParametersInReverseOrder() {
			return true;
		}

		@Override
		public boolean useMaxForLimit() {
			return true;
		}
	};

	private static final int PARAM_LIST_SIZE_LIMIT = 1000;

	/**
	 * Constructs an Oracle8iDialect
	 */
	public Oracle8iDialect() {
		super();
		registerCharacterTypeMappings();
		registerNumericTypeMappings();
		registerDateTimeTypeMappings();
		registerLargeObjectTypeMappings();
		registerReverseHibernateTypeMappings();
		registerFunctions();
		registerDefaultProperties();
	}

	protected void registerCharacterTypeMappings() {
		registerColumnType( Types.CHAR, "char(1)" );
		registerColumnType( Types.VARCHAR, 4000, "varchar2($l)" );
		registerColumnType( Types.VARCHAR, "long" );
	}

	protected void registerNumericTypeMappings() {
		registerColumnType( Types.BIT, "number(1,0)" );
		registerColumnType( Types.BIGINT, "number(19,0)" );
		registerColumnType( Types.SMALLINT, "number(5,0)" );
		registerColumnType( Types.TINYINT, "number(3,0)" );
		registerColumnType( Types.INTEGER, "number(10,0)" );

		registerColumnType( Types.FLOAT, "float" );
		registerColumnType( Types.DOUBLE, "double precision" );
		registerColumnType( Types.NUMERIC, "number($p,$s)" );
		registerColumnType( Types.DECIMAL, "number($p,$s)" );

		registerColumnType( Types.BOOLEAN, "number(1,0)" );
	}

	protected void registerDateTimeTypeMappings() {
		registerColumnType( Types.DATE, "date" );
		registerColumnType( Types.TIME, "date" );
		registerColumnType( Types.TIMESTAMP, "date" );
	}

	protected void registerLargeObjectTypeMappings() {
		registerColumnType( Types.BINARY, 2000, "raw($l)" );
		registerColumnType( Types.BINARY, "long raw" );

		registerColumnType( Types.VARBINARY, 2000, "raw($l)" );
		registerColumnType( Types.VARBINARY, "long raw" );

		registerColumnType( Types.BLOB, "blob" );
		registerColumnType( Types.CLOB, "clob" );

		registerColumnType( Types.LONGVARCHAR, "long" );
		registerColumnType( Types.LONGVARBINARY, "long raw" );
	}

	protected void registerReverseHibernateTypeMappings() {
	}

	protected void registerFunctions() {
		registerFunction( "abs", new StandardSQLFunction("abs") );
		registerFunction( "sign", new StandardSQLFunction("sign", StandardBasicTypes.INTEGER) );

		registerFunction( "acos", new StandardSQLFunction("acos", StandardBasicTypes.DOUBLE) );
		registerFunction( "asin", new StandardSQLFunction("asin", StandardBasicTypes.DOUBLE) );
		registerFunction( "atan", new StandardSQLFunction("atan", StandardBasicTypes.DOUBLE) );
		registerFunction( "bitand", new StandardSQLFunction("bitand") );
		registerFunction( "cos", new StandardSQLFunction("cos", StandardBasicTypes.DOUBLE) );
		registerFunction( "cosh", new StandardSQLFunction("cosh", StandardBasicTypes.DOUBLE) );
		registerFunction( "exp", new StandardSQLFunction("exp", StandardBasicTypes.DOUBLE) );
		registerFunction( "ln", new StandardSQLFunction("ln", StandardBasicTypes.DOUBLE) );
		registerFunction( "sin", new StandardSQLFunction("sin", StandardBasicTypes.DOUBLE) );
		registerFunction( "sinh", new StandardSQLFunction("sinh", StandardBasicTypes.DOUBLE) );
		registerFunction( "stddev", new StandardSQLFunction("stddev", StandardBasicTypes.DOUBLE) );
		registerFunction( "sqrt", new StandardSQLFunction("sqrt", StandardBasicTypes.DOUBLE) );
		registerFunction( "tan", new StandardSQLFunction("tan", StandardBasicTypes.DOUBLE) );
		registerFunction( "tanh", new StandardSQLFunction("tanh", StandardBasicTypes.DOUBLE) );
		registerFunction( "variance", new StandardSQLFunction("variance", StandardBasicTypes.DOUBLE) );

		registerFunction( "round", new StandardSQLFunction("round") );
		registerFunction( "trunc", new StandardSQLFunction("trunc") );
		registerFunction( "ceil", new StandardSQLFunction("ceil") );
		registerFunction( "floor", new StandardSQLFunction("floor") );

		registerFunction( "chr", new StandardSQLFunction("chr", StandardBasicTypes.CHARACTER) );
		registerFunction( "initcap", new StandardSQLFunction("initcap") );
		registerFunction( "lower", new StandardSQLFunction("lower") );
		registerFunction( "ltrim", new StandardSQLFunction("ltrim") );
		registerFunction( "rtrim", new StandardSQLFunction("rtrim") );
		registerFunction( "soundex", new StandardSQLFunction("soundex") );
		registerFunction( "upper", new StandardSQLFunction("upper") );
		registerFunction( "ascii", new StandardSQLFunction("ascii", StandardBasicTypes.INTEGER) );

		registerFunction( "to_char", new StandardSQLFunction("to_char", StandardBasicTypes.STRING) );
		registerFunction( "to_date", new StandardSQLFunction("to_date", StandardBasicTypes.TIMESTAMP) );

		registerFunction( "current_date", new NoArgSQLFunction("current_date", StandardBasicTypes.DATE, false) );
		registerFunction( "current_time", new NoArgSQLFunction("current_timestamp", StandardBasicTypes.TIME, false) );
		registerFunction( "current_timestamp", new NoArgSQLFunction("current_timestamp", StandardBasicTypes.TIMESTAMP, false) );

		registerFunction( "last_day", new StandardSQLFunction("last_day", StandardBasicTypes.DATE) );
		registerFunction( "sysdate", new NoArgSQLFunction("sysdate", StandardBasicTypes.DATE, false) );
		registerFunction( "systimestamp", new NoArgSQLFunction("systimestamp", StandardBasicTypes.TIMESTAMP, false) );
		registerFunction( "uid", new NoArgSQLFunction("uid", StandardBasicTypes.INTEGER, false) );
		registerFunction( "user", new NoArgSQLFunction("user", StandardBasicTypes.STRING, false) );

		registerFunction( "rowid", new NoArgSQLFunction("rowid", StandardBasicTypes.LONG, false) );
		registerFunction( "rownum", new NoArgSQLFunction("rownum", StandardBasicTypes.LONG, false) );

		// Multi-param string dialect functions...
		registerFunction( "concat", new VarArgsSQLFunction(StandardBasicTypes.STRING, "", "||", "") );
		registerFunction( "instr", new StandardSQLFunction("instr", StandardBasicTypes.INTEGER) );
		registerFunction( "instrb", new StandardSQLFunction("instrb", StandardBasicTypes.INTEGER) );
		registerFunction( "lpad", new StandardSQLFunction("lpad", StandardBasicTypes.STRING) );
		registerFunction( "replace", new StandardSQLFunction("replace", StandardBasicTypes.STRING) );
		registerFunction( "rpad", new StandardSQLFunction("rpad", StandardBasicTypes.STRING) );
		registerFunction( "substr", new StandardSQLFunction("substr", StandardBasicTypes.STRING) );
		registerFunction( "substrb", new StandardSQLFunction("substrb", StandardBasicTypes.STRING) );
		registerFunction( "translate", new StandardSQLFunction("translate", StandardBasicTypes.STRING) );

		registerFunction( "substring", new StandardSQLFunction( "substr", StandardBasicTypes.STRING ) );
		registerFunction( "locate", new SQLFunctionTemplate( StandardBasicTypes.INTEGER, "instr(?2,?1)" ) );
		registerFunction( "bit_length", new SQLFunctionTemplate( StandardBasicTypes.INTEGER, "vsize(?1)*8" ) );
		registerFunction( "coalesce", new NvlFunction() );

		// Multi-param numeric dialect functions...
		registerFunction( "atan2", new StandardSQLFunction("atan2", StandardBasicTypes.FLOAT) );
		registerFunction( "log", new StandardSQLFunction("log", StandardBasicTypes.INTEGER) );
		registerFunction( "mod", new StandardSQLFunction("mod", StandardBasicTypes.INTEGER) );
		registerFunction( "nvl", new StandardSQLFunction("nvl") );
		registerFunction( "nvl2", new StandardSQLFunction("nvl2") );
		registerFunction( "power", new StandardSQLFunction("power", StandardBasicTypes.FLOAT) );

		// Multi-param date dialect functions...
		registerFunction( "add_months", new StandardSQLFunction("add_months", StandardBasicTypes.DATE) );
		registerFunction( "months_between", new StandardSQLFunction("months_between", StandardBasicTypes.FLOAT) );
		registerFunction( "next_day", new StandardSQLFunction("next_day", StandardBasicTypes.DATE) );

		registerFunction( "str", new StandardSQLFunction("to_char", StandardBasicTypes.STRING) );
	}

	protected void registerDefaultProperties() {
		getDefaultProperties().setProperty( Environment.USE_STREAMS_FOR_BINARY, "true" );
		getDefaultProperties().setProperty( Environment.STATEMENT_BATCH_SIZE, DEFAULT_BATCH_SIZE );
		// Oracle driver reports to support getGeneratedKeys(), but they only
		// support the version taking an array of the names of the columns to
		// be returned (via its RETURNING clause).  No other driver seems to
		// support this overloaded version.
		getDefaultProperties().setProperty( Environment.USE_GET_GENERATED_KEYS, "false" );
		getDefaultProperties().setProperty( Environment.BATCH_VERSIONED_DATA, "false" );
	}

	@Override
	protected SqlTypeDescriptor getSqlTypeDescriptorOverride(int sqlCode) {
		return sqlCode == Types.BOOLEAN ? BitTypeDescriptor.INSTANCE : super.getSqlTypeDescriptorOverride( sqlCode );
	}


	// features which change between 8i, 9i, and 10g ~~~~~~~~~~~~~~~~~~~~~~~~~~

	@Override
	public JoinFragment createOuterJoinFragment() {
		return new OracleJoinFragment();
	}

	@Override
	public String getCrossJoinSeparator() {
		return ", ";
	}

	/**
	 * Map case support to the Oracle DECODE function.  Oracle did not
	 * add support for CASE until 9i.
	 * 

* {@inheritDoc} */ @Override public CaseFragment createCaseFragment() { return new DecodeCaseFragment(); } @Override public LimitHandler getLimitHandler() { return LIMIT_HANDLER; } @Override public String getLimitString(String sql, boolean hasOffset) { sql = sql.trim(); boolean isForUpdate = false; if ( sql.toLowerCase(Locale.ROOT).endsWith( " for update" ) ) { sql = sql.substring( 0, sql.length()-11 ); isForUpdate = true; } final StringBuilder pagingSelect = new StringBuilder( sql.length()+100 ); if (hasOffset) { pagingSelect.append( "select * from ( select row_.*, rownum rownum_ from ( " ); } else { pagingSelect.append( "select * from ( " ); } pagingSelect.append( sql ); if (hasOffset) { pagingSelect.append( " ) row_ ) where rownum_ <= ? and rownum_ > ?" ); } else { pagingSelect.append( " ) where rownum <= ?" ); } if ( isForUpdate ) { pagingSelect.append( " for update" ); } return pagingSelect.toString(); } /** * Allows access to the basic {@link Dialect#getSelectClauseNullString} * implementation... * * @param sqlType The {@link java.sql.Types} mapping type code * @return The appropriate select clause fragment */ public String getBasicSelectClauseNullString(int sqlType) { return super.getSelectClauseNullString( sqlType ); } @Override public String getSelectClauseNullString(int sqlType) { switch(sqlType) { case Types.VARCHAR: case Types.CHAR: return "to_char(null)"; case Types.DATE: case Types.TIMESTAMP: case Types.TIME: return "to_date(null)"; default: return "to_number(null)"; } } @Override public String getCurrentTimestampSelectString() { return "select sysdate from dual"; } @Override public String getCurrentTimestampSQLFunctionName() { return "sysdate"; } // features which remain constant across 8i, 9i, and 10g ~~~~~~~~~~~~~~~~~~ @Override public String getAddColumnString() { return "add"; } @Override public String getSequenceNextValString(String sequenceName) { return "select " + getSelectSequenceNextValString( sequenceName ) + " from dual"; } @Override public String getSelectSequenceNextValString(String sequenceName) { return sequenceName + ".nextval"; } @Override public String getCreateSequenceString(String sequenceName) { //starts with 1, implicitly return "create sequence " + sequenceName; } @Override protected String getCreateSequenceString(String sequenceName, int initialValue, int incrementSize) { if ( initialValue < 0 && incrementSize > 0 ) { return String.format( "%s minvalue %d start with %d increment by %d", getCreateSequenceString( sequenceName ), initialValue, initialValue, incrementSize ); } else if ( initialValue > 0 && incrementSize < 0 ) { return String.format( "%s maxvalue %d start with %d increment by %d", getCreateSequenceString( sequenceName ), initialValue, initialValue, incrementSize ); } else { return String.format( "%s start with %d increment by %d", getCreateSequenceString( sequenceName ), initialValue, incrementSize ); } } @Override public String getDropSequenceString(String sequenceName) { return "drop sequence " + sequenceName; } @Override public String getCascadeConstraintsString() { return " cascade constraints"; } @Override public boolean dropConstraints() { return false; } @Override public String getForUpdateNowaitString() { return " for update nowait"; } @Override public boolean supportsSequences() { return true; } @Override public boolean supportsPooledSequences() { return true; } @Override public boolean supportsLimit() { return true; } @Override public String getForUpdateString(String aliases) { return getForUpdateString() + " of " + aliases; } @Override public String getForUpdateNowaitString(String aliases) { return getForUpdateString() + " of " + aliases + " nowait"; } @Override public boolean bindLimitParametersInReverseOrder() { return true; } @Override public boolean useMaxForLimit() { return true; } @Override public boolean forUpdateOfColumns() { return true; } @Override public String getQuerySequencesString() { return "select * from all_sequences"; } public SequenceInformationExtractor getSequenceInformationExtractor() { return SequenceInformationExtractorOracleDatabaseImpl.INSTANCE; } @Override public String getSelectGUIDString() { return "select rawtohex(sys_guid()) from dual"; } @Override public ViolatedConstraintNameExtracter getViolatedConstraintNameExtracter() { return EXTRACTER; } private static final ViolatedConstraintNameExtracter EXTRACTER = new TemplatedViolatedConstraintNameExtracter() { /** * Extract the name of the violated constraint from the given SQLException. * * @param sqle The exception that was the result of the constraint violation. * @return The extracted constraint name. */ @Override protected String doExtractConstraintName(SQLException sqle) throws NumberFormatException { final int errorCode = JdbcExceptionHelper.extractErrorCode( sqle ); if ( errorCode == 1 || errorCode == 2291 || errorCode == 2292 ) { return extractUsingTemplate( "(", ")", sqle.getMessage() ); } else if ( errorCode == 1400 ) { // simple nullability constraint return null; } else { return null; } } }; @Override public SQLExceptionConversionDelegate buildSQLExceptionConversionDelegate() { return new SQLExceptionConversionDelegate() { @Override public JDBCException convert(SQLException sqlException, String message, String sql) { // interpreting Oracle exceptions is much much more precise based on their specific vendor codes. final int errorCode = JdbcExceptionHelper.extractErrorCode( sqlException ); // lock timeouts ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ if ( errorCode == 30006 ) { // ORA-30006: resource busy; acquire with WAIT timeout expired throw new LockTimeoutException( message, sqlException, sql ); } else if ( errorCode == 54 ) { // ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired throw new LockTimeoutException( message, sqlException, sql ); } else if ( 4021 == errorCode ) { // ORA-04021 timeout occurred while waiting to lock object throw new LockTimeoutException( message, sqlException, sql ); } // deadlocks ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ if ( 60 == errorCode ) { // ORA-00060: deadlock detected while waiting for resource return new LockAcquisitionException( message, sqlException, sql ); } else if ( 4020 == errorCode ) { // ORA-04020 deadlock detected while trying to lock object return new LockAcquisitionException( message, sqlException, sql ); } // query cancelled ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ if ( 1013 == errorCode ) { // ORA-01013: user requested cancel of current operation throw new QueryTimeoutException( message, sqlException, sql ); } // data integrity violation ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ if ( 1407 == errorCode ) { // ORA-01407: cannot update column to NULL final String constraintName = getViolatedConstraintNameExtracter().extractConstraintName( sqlException ); return new ConstraintViolationException( message, sqlException, sql, constraintName ); } return null; } }; } @Override public int registerResultSetOutParameter(CallableStatement statement, int col) throws SQLException { // register the type of the out param - an Oracle specific type statement.registerOutParameter( col, OracleTypesHelper.INSTANCE.getOracleCursorTypeSqlType() ); col++; return col; } @Override public ResultSet getResultSet(CallableStatement ps) throws SQLException { ps.execute(); return (ResultSet) ps.getObject( 1 ); } @Override public boolean supportsUnionAll() { return true; } @Override public boolean supportsCommentOn() { return true; } @Override public MultiTableBulkIdStrategy getDefaultMultiTableBulkIdStrategy() { return new GlobalTemporaryTableBulkIdStrategy( new IdTableSupportStandardImpl() { @Override public String generateIdTableName(String baseName) { final String name = super.generateIdTableName( baseName ); return name.length() > 30 ? name.substring( 0, 30 ) : name; } @Override public String getCreateIdTableCommand() { return "create global temporary table"; } @Override public String getCreateIdTableStatementOptions() { return "on commit delete rows"; } }, AfterUseAction.CLEAN ); } @Override public boolean supportsCurrentTimestampSelection() { return true; } @Override public boolean isCurrentTimestampSelectStringCallable() { return false; } @Override public boolean supportsEmptyInList() { return false; } @Override public boolean supportsExistsInSelect() { return false; } @Override public int getInExpressionCountLimit() { return PARAM_LIST_SIZE_LIMIT; } @Override public boolean forceLobAsLastValue() { return true; } /** * For Oracle, the FOR UPDATE clause cannot be applied when using ORDER BY, DISTINCT or views. * @param parameters * @return {@code true} indicates that the dialect requests that locking be applied by subsequent select; * {@code false} (the default) indicates that locking should be applied to the main SQL statement.. @see Oracle FOR UPDATE restrictions */ @Override public boolean useFollowOnLocking(QueryParameters parameters) { if (parameters != null ) { String lowerCaseSQL = parameters.getFilteredSQL().toLowerCase(); return DISTINCT_KEYWORD_PATTERN.matcher( lowerCaseSQL ).find() || GROUP_BY_KEYWORD_PATTERN.matcher( lowerCaseSQL ).find() || UNION_KEYWORD_PATTERN.matcher( lowerCaseSQL ).find() || ( parameters.hasRowSelection() && ( ORDER_BY_KEYWORD_PATTERN.matcher( lowerCaseSQL ).find() || parameters.getRowSelection().getFirstRow() != null ) ); } else { return true; } } @Override public String getNotExpression( String expression ) { return "not (" + expression + ")"; } @Override public String getQueryHintString(String sql, String hints) { String statementType = statementType(sql); final int pos = sql.indexOf( statementType ); if ( pos > -1 ) { final StringBuilder buffer = new StringBuilder( sql.length() + hints.length() + 8 ); if ( pos > 0 ) { buffer.append( sql.substring( 0, pos ) ); } buffer .append( statementType ) .append( " /*+ " ) .append( hints ) .append( " */" ) .append( sql.substring( pos + statementType.length() ) ); sql = buffer.toString(); } return sql; } @Override public int getMaxAliasLength() { // Oracle's max identifier length is 30, but Hibernate needs to add "uniqueing info" so we account for that, return 20; } @Override public CallableStatementSupport getCallableStatementSupport() { // Oracle supports returning cursors return StandardCallableStatementSupport.REF_CURSOR_INSTANCE; } @Override public boolean canCreateSchema() { return false; } @Override public String getCurrentSchemaCommand() { return "select sys_context('USERENV', 'CURRENT_SCHEMA') from dual"; } @Override public boolean supportsPartitionBy() { return true; } protected String statementType(String sql) { Matcher matcher = SQL_STATEMENT_TYPE_PATTERN.matcher( sql ); if(matcher.matches() && matcher.groupCount() == 1) { return matcher.group(1); } throw new IllegalArgumentException( "Can't determine SQL statement type for statement: " + sql ); } @Override public boolean supportsNoWait() { return true; } }





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