import org.hibernate.PessimisticLockException; //导入依赖的package包/类
@Override
public SQLExceptionConversionDelegate buildSQLExceptionConversionDelegate() {
	return new SQLExceptionConversionDelegate() {
		@Override
		public JDBCException convert(SQLException sqlException, String message, String sql) {
			final String sqlState = JdbcExceptionHelper.extractSqlState( sqlException );

			if ( "40P01".equals( sqlState ) ) {
				// DEADLOCK DETECTED
				return new LockAcquisitionException( message, sqlException, sql );
			}

			if ( "55P03".equals( sqlState ) ) {
				// LOCK NOT AVAILABLE
				return new PessimisticLockException( message, sqlException, sql );
			}

			// returning null allows other delegates to operate
			return null;
		}
	};
}
 

import org.hibernate.PessimisticLockException; //导入依赖的package包/类
private static boolean isLockingException(final Throwable t, final boolean recurse) {
    if (t instanceof LockingException || t instanceof LockAcquisitionException || t instanceof PessimisticLockException) {
        return true;
    }
    if (t instanceof SQLException) {
        final SQLException e = (SQLException) t;
        return e.getErrorCode() == ER_LOCK_WAIT_TIMEOUT || ST_LOCK.equals(e.getSQLState());
    }
    if (recurse) {
        for (final Throwable thr : ExceptionUtils.getThrowables(t)) {
            if (isLockingException(thr, false)) {
                return true;
            }
        }
    }
    return false;
}
 

import org.hibernate.PessimisticLockException; //导入依赖的package包/类
@Override
public boolean isTransient(Exception e) {
    if (e instanceof LockAcquisitionException || e instanceof PessimisticLockException || e instanceof JDBCConnectionException) {
        return true;
    }
    if (e instanceof GenericJDBCException) {
        JDBCException se = (JDBCException) e;
        return super.isTransient(se.getSQLException());
    }
    return false;
}
 

import org.hibernate.PessimisticLockException; //导入依赖的package包/类
@Override
public JDBCException convert(SQLException sqlException, String message, String sql) {
	final String sqlState = JdbcExceptionHelper.extractSqlState( sqlException );
	final int errorCode = JdbcExceptionHelper.extractErrorCode( sqlException );

	if ( sqlState != null ) {
		String sqlStateClassCode = JdbcExceptionHelper.determineSqlStateClassCode( sqlState );

		if ( sqlStateClassCode != null ) {
			if ( SQL_GRAMMAR_CATEGORIES.contains( sqlStateClassCode ) ) {
				return new SQLGrammarException( message, sqlException, sql );
			}
			else if ( INTEGRITY_VIOLATION_CATEGORIES.contains( sqlStateClassCode ) ) {
				final String constraintName = getConversionContext()
						.getViolatedConstraintNameExtracter()
						.extractConstraintName( sqlException );
				return new ConstraintViolationException( message, sqlException, sql, constraintName );
			}
			else if ( CONNECTION_CATEGORIES.contains( sqlStateClassCode ) ) {
				return new JDBCConnectionException( message, sqlException, sql );
			}
			else if ( DATA_CATEGORIES.contains( sqlStateClassCode ) ) {
				return new DataException( message, sqlException, sql );
			}
		}

		if ( "40001".equals( sqlState ) ) {
			return new LockAcquisitionException( message, sqlException, sql );
		}

		if ( "40XL1".equals( sqlState ) || "40XL2".equals( sqlState )) {
			// Derby "A lock could not be obtained within the time requested."
			return new PessimisticLockException( message, sqlException, sql );
		}

		// MySQL Query execution was interrupted
		if ( "70100".equals( sqlState ) ||
				// Oracle user requested cancel of current operation
				( "72000".equals( sqlState ) && errorCode == 1013 ) ) {
			throw new QueryTimeoutException(  message, sqlException, sql );
		}
	}

	return null;
}