JDBC:Hent typen af ​​et array fra metadataene

Brug java.sql.ResultSetMetaData.getColumnTypeName() :

Oracle-opsætning :

CREATE OR REPLACE TYPE random_array IS TABLE OF VARCHAR2(42);
/

Java :

Class.forName("oracle.jdbc.OracleDriver");

Connection con = DriverManager.getConnection(
    "jdbc:oracle:thin:@localhost:1521:orcl",
    "username",
    "password"
);

PreparedStatement st = con.prepareStatement(
    "SELECT random_array( 'a', 'b', 'c' ) AS array FROM DUAL"
);

ResultSet rs = st.executeQuery();
while( rs.next() )
{
  String type = rs.getMetaData().getColumnTypeName(1);
  String[] data = (String[]) rs.getArray(1).getArray();
  System.out.println( type + ": " + Arrays.toString( data ) );
}

st.close();
con.close();

Output :

SCHEMA_NAME.RANDOM_ARRAY: [a, b, c]

Hvis du så vil gå tilbage til Oracle og finde typen af ​​samlingselementerne kan du bruge:

SELECT ELEM_TYPE_NAME,
       LENGTH,
       PRECISION,
       SCALE
FROM   ALL_COLL_TYPES
WHERE  TYPE_NAME = 'RANDOM_ARRAY'
AND    OWNER     = 'SCHEMA_NAME';

Hvilken udgang:

ELEM_TYPE_NAME LENGTH PRECISION SCALE
-------------- ------ --------- -----
VARCHAR2           42