How to get sequence metadata from JDBC?

Question

I am trying to get various metadata of my Oracle database from Java code (using basic JDBC). For example, if I want to get a list of tables with a suffix _FOO, I can do something like:

Connection connection = dataSource.getConnection();
DatabaseMetaData meta = connection.getMetaData();
ResultSet tables = meta.getTables(connection.getCatalog(), null, "%_FOO", new String[] { "TABLE" });
// Iterate on the ResultSet to get information on tables...

Now I want to get all sequences from my database (for example, the entire sequence with a name S_xxx_FOO).

How do I do this since I don't see anything in DatabaseMetaDatasequences related?

Should I run a type request select * from user_sequences?

Answer 1

API JDBC, (-) .

- ( , Oracle , user_sequences)

Answer 2

. . "SEQUENCE" getMetaData(). GetTables() param.

:

meta.getTables(connection.getCatalog(), null, "% _FOO", String [] { "SEQUENCE" });

Answer 3

hibernate api . . http://docs.jboss.org/hibernate/orm/3.2/api/org/hibernate/dialect/Dialect.html

,

public static void main(String[] args) {
        Connection jdbcConnection = null;
        try {
            jdbcConnection = DriverManager.getConnection("", "", "");
            printAllSequenceName(jdbcConnection);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            if(jdbcConnection != null) {
                try {
                    jdbcConnection.close();
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
}

public static void printAllSequenceName(Connection conn) throws JDBCConnectionException, SQLException {
        DialectResolver dialectResolver = new StandardDialectResolver();
        Dialect dialect =  dialectResolver.resolveDialect(conn.getMetaData());

        if ( dialect.supportsSequences() ) {
            String sql = dialect.getQuerySequencesString();
            if (sql!=null) {

                Statement statement = null;
                ResultSet rs = null;
                try {
                    statement = conn.createStatement();
                    rs = statement.executeQuery(sql);

                    while ( rs.next() ) {
                        System.out.println("Sequence Name : " +  rs.getString(1));
                    }
                }
                finally {
                    if (rs!=null) rs.close();
                    if (statement!=null) statement.close();
                }

            }
        }
    }

, .

interface SequenceQueryGenerator {
    String getSelectSequenceNextValString(String sequenceName);
    String getCreateSequenceString(String sequenceName, int initialValue, int incrementSize); 
    String getDropSequenceStrings(String sequenceName); 
    String getQuerySequencesString(); 
}


class OracleSequenceQueryGenerator implements SequenceQueryGenerator {

    @Override
    public String getSelectSequenceNextValString(String sequenceName) {
        return "select " + getSelectSequenceNextValString( sequenceName ) + " from dual";
    }

    @Override
    public String getCreateSequenceString(String sequenceName,
            int initialValue, int incrementSize) {
        return "create sequence " + sequenceName +  " start with " + initialValue + " increment by " + incrementSize;
    }

    @Override
    public String getDropSequenceStrings(String sequenceName) {
        return "drop sequence " + sequenceName;
    }

    @Override
    public String getQuerySequencesString() {
        return "select sequence_name from user_sequences";
    }

}


class PostgresSequenceQueryGenerator implements SequenceQueryGenerator {

    @Override
    public String getSelectSequenceNextValString(String sequenceName) {
        return "select " + getSelectSequenceNextValString( sequenceName );
    }

    @Override
    public String getCreateSequenceString(String sequenceName,
            int initialValue, int incrementSize) {
        return "create sequence " + sequenceName + " start " + initialValue + " increment " + incrementSize;
    }

    @Override
    public String getDropSequenceStrings(String sequenceName) {
        return "drop sequence " + sequenceName;
    }

    @Override
    public String getQuerySequencesString() {
        return "select relname from pg_class where relkind='S'";
    }

}

public void printSequenceName (SequenceQueryGenerator queryGenerator, Connection conn) throws SQLException {
        String sql = queryGenerator.getQuerySequencesString();
        if (sql!=null) {

            Statement statement = null;
            ResultSet rs = null;
            try {
                statement = conn.createStatement();
                rs = statement.executeQuery(sql);

                while ( rs.next() ) {
                    System.out.println("Sequence Name : " +  rs.getString(1));
                }
            }
            finally {
                if (rs!=null) rs.close();
                if (statement!=null) statement.close();
            }

        }
    }

public static void main(String[] args) {
        Connection jdbcConnection = null;
        try {
            jdbcConnection = DriverManager.getConnection("", "", "");
            printAllSequenceName(new OracleSequenceQueryGenerator(), jdbcConnection);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally {
            if(jdbcConnection != null) {
                try {
                    jdbcConnection.close();
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
}

Answer 4

, JDBC Oracle (, 12.1.0.2) , DatabaseMetaData#getTables types, ["SEQUENCE"], , :

  SELECT o.owner AS sequence_owner,
       o.object_name AS sequence_name
  FROM all_objects o
  WHERE o.owner LIKE 'someOwnerPattern' ESCAPE '/'
    AND o.object_name LIKE 'someNamePattern' ESCAPE '/'
    AND o.object_type = 'SEQUENCE'
  ORDER BY 1, 2

... someOwnerPattern someNamePattern SQL, , LIKE (, % -).

, , , , SEQUENCE.