Examples of java.sql.Array

java.sql.Array
The mapping in the Java programming language for the SQL type ARRAY. By default, an Array value is a transaction-duration reference to an SQL ARRAY value. By default, an Array object is implemented using an SQL LOCATOR(array) internally, which means that an Array object contains a logical pointer to the data in the SQL ARRAY value rather than containing the ARRAY value's data.
The Array interface provides methods for bringing an SQL ARRAY value's data to the client as either an array or a ResultSet object. If the elements of the SQL ARRAY are a UDT, they may be custom mapped. To create a custom mapping, a programmer must do two things:
- create a class that implements the {@link SQLData}interface for the UDT to be custom mapped.
- make an entry in a type map that contains
  - the fully-qualified SQL type name of the UDT
  - the Class object for the class implementing SQLData
When a type map with an entry for the base type is supplied to the methods getArray and getResultSet, the mapping it contains will be used to map the elements of the ARRAY value. If no type map is supplied, which would typically be the case, the connection's type map is used by default. If the connection's type map or a type map supplied to a method has no entry for the base type, the elements are mapped according to the standard mapping.
All methods on the Array interface must be fully implemented if the JDBC driver supports the data type. @since 1.2

    ResultSet rs = stmt.executeQuery("SELECT relacl FROM pg_class WHERE relacl IS NOT NULL LIMIT 1");
    ResultSetMetaData rsmd = rs.getMetaData();
    assertEquals(Types.ARRAY, rsmd.getColumnType(1));


    assertTrue(rs.next());
    Array arr = rs.getArray(1);
    assertEquals("aclitem", arr.getBaseTypeName());


    ResultSet arrRS = arr.getResultSet();
    ResultSetMetaData arrRSMD = arrRS.getMetaData();
    assertEquals("aclitem", arrRSMD.getColumnTypeName(2));
  }

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  @Test
  public void testRecursiveResultSets() throws SQLException {
    Statement stmt = conn.createStatement();
    ResultSet rs = stmt.executeQuery("SELECT '{{1,2},{3,4}}'::int[]");
    assertTrue(rs.next());
    Array arr = rs.getArray(1);


    ResultSet arrRS = arr.getResultSet();
    ResultSetMetaData arrRSMD = arrRS.getMetaData();
    assertEquals(Types.ARRAY, arrRSMD.getColumnType(2));
    assertEquals("_int4", arrRSMD.getColumnTypeName(2));


    assertTrue(arrRS.next());
    assertEquals(1, arrRS.getInt(1));
    Array a1 = arrRS.getArray(2);
    ResultSet a1RS = a1.getResultSet();
    ResultSetMetaData a1RSMD = a1RS.getMetaData();
    assertEquals(Types.INTEGER, a1RSMD.getColumnType(2));
    assertEquals("int4", a1RSMD.getColumnTypeName(2));


    assertTrue(a1RS.next());
    assertEquals(1, a1RS.getInt(2));
    assertTrue(a1RS.next());
    assertEquals(2, a1RS.getInt(2));
    assertTrue(!a1RS.next());
    a1RS.close();


    assertTrue(arrRS.next());
    assertEquals(2, arrRS.getInt(1));
    Array a2 = arrRS.getArray(2);
    ResultSet a2RS = a2.getResultSet();


    assertTrue(a2RS.next());
    assertEquals(3, a2RS.getInt(2));
    assertTrue(a2RS.next());
    assertEquals(4, a2RS.getInt(2));

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  @Test
  public void testNullString() throws SQLException {
    Statement stmt = conn.createStatement();
    ResultSet rs = stmt.executeQuery("SELECT '{a,NULL}'::text[]");
    assertTrue(rs.next());
    Array arr = rs.getArray(1);


    String[] s = (String[]) arr.getArray();
    assertEquals(2, s.length);
    assertEquals("a", s[0]);
    assertNull(s[1]);
  }

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    String sql = "SELECT E'{{c\\\\\"d, ''}, {\"\\\\\\\\\",\"''\"}}'::text[]";


    ResultSet rs = stmt.executeQuery(sql);
    assertTrue(rs.next());


    Array arr = rs.getArray(1);
    String[][] s = (String[][]) arr.getArray();
    assertEquals("c\"d", s[0][0]);
    assertEquals("'", s[0][1]);
    assertEquals("\\", s[1][0]);
    assertEquals("'", s[1][1]);


    ResultSet arrRS = arr.getResultSet();


    assertTrue(arrRS.next());
    Array a1 = arrRS.getArray(2);
    ResultSet rs1 = a1.getResultSet();
    assertTrue(rs1.next());
    assertEquals("c\"d", rs1.getString(2));
    assertTrue(rs1.next());
    assertEquals("'", rs1.getString(2));
    assertTrue(!rs1.next());


    assertTrue(arrRS.next());
    Array a2 = arrRS.getArray(2);
    ResultSet rs2 = a2.getResultSet();
    assertTrue(rs2.next());
    assertEquals("\\", rs2.getString(2));
    assertTrue(rs2.next());
    assertEquals("'", rs2.getString(2));
    assertTrue(!rs2.next());

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  @Test
  public void testWriteMultiDimensional() throws SQLException {
    Statement stmt = conn.createStatement();
    ResultSet rs = stmt.executeQuery("SELECT '{{1,2},{3,4}}'::int[]");
    assertTrue(rs.next());
    Array arr = rs.getArray(1);
    rs.close();
    stmt.close();


    String sql = "SELECT ?::int[]";


    PreparedStatement pstmt = conn.prepareStatement(sql);
    pstmt.setArray(1, arr);
    rs = pstmt.executeQuery();
    assertTrue(rs.next());
    arr = rs.getArray(1);


    Integer[][] i = (Integer[][]) arr.getArray();
    assertEquals(1, i[0][0].intValue());
    assertEquals(2, i[0][1].intValue());
    assertEquals(3, i[1][0].intValue());
    assertEquals(4, i[1][1].intValue());
  }

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    in[2] = 2;
    pstmt.setArray(1, conn.createArrayOf("int4", in));


    ResultSet rs = pstmt.executeQuery();
    assertTrue(rs.next());
    Array arr = rs.getArray(1);
    Integer[] out = (Integer[]) arr.getArray();


    assertEquals(3, out.length);
    assertEquals(0, out[0].intValue());
    assertEquals(-1, out[1].intValue());
    assertEquals(2, out[2].intValue());

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    in[1][1] = "\"\\'z";
    pstmt.setArray(1, conn.createArrayOf("text", in));


    ResultSet rs = pstmt.executeQuery();
    assertTrue(rs.next());
    Array arr = rs.getArray(1);
    String[][] out = (String[][]) arr.getArray();


    assertEquals(2, out.length);
    assertEquals(2, out[0].length);
    assertEquals("a", out[0][0]);
    assertEquals("", out[0][1]);

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    in[1] = null;
    pstmt.setArray(1, conn.createArrayOf("int8", in));


    ResultSet rs = pstmt.executeQuery();
    assertTrue(rs.next());
    Array arr = rs.getArray(1);
    Long[] out = (Long[]) arr.getArray();


    assertEquals(2, out.length);
    assertNull(out[0]);
    assertNull(out[1]);
  }

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    Integer[] in = new Integer[0];
    pstmt.setArray(1, conn.createArrayOf("integer", in));


    ResultSet rs = pstmt.executeQuery();
    assertTrue(rs.next());
    Array arr = rs.getArray(1);
    Integer[] out = (Integer[]) arr.getArray();


    assertEquals(0, out.length);


    ResultSet arrRs = arr.getResultSet();
    assertFalse(arrRs.next());
  }

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    in[0][0] = "a";
    in[0][1] = "";
    in[1][0] = "\\";
    in[1][1] = "\"\\'z";


    Array arr = conn.createArrayOf("varchar", in);
    String[][] out = (String[][]) arr.getArray();


    assertEquals(2, out.length);
    assertEquals(2, out[0].length);
    assertEquals("a", out[0][0]);
    assertEquals("", out[0][1]);

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