创新互联OceanBase教程：OceanBase使用ARRAY和STRUCT类
数组和 STRUCT 类同属于集合类，一般会一起使用。
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ARRAY 描述符
创建和使用 ARRAY 对象需要一个描述符（即 oracle.sql.ArrayDescriptor 类的实例）。对于与相同 SQL 类型相对应的任意数量的 ARRAY 对象，只需一个 ArrayDescriptor 对象。
ARRAY 类方法
oracle.sql.ARRAY 类包含以下方法：
-
getDescriptor返回描述数组类型的
ArrayDescriptor对象。
-
getArray检索默认 JDBC 类型的数组的内容。如果它检索对象数组，则
getArray使用数据库连接对象的默认类型映射来确定类型。 -
getOracleArray与
getArray相同，但是以oracle.sql.*格式检索元素。
-
getBaseType返回数组元素的 SQL 类型代码。
-
getBaseTypeName返回此数组的元素的 SQL 类型名称。
-
getSQLTypeName返回整个数组的标准 SQL 类型名称。此方法是 Oracle 扩展。
-
getResultSet将数组元素具体化为结果集。
-
getJavaSQLConnection返回与此数组关联的连接实例。
-
length返回数组中的元素数。
使用 ARRAY 和 STRUCT 类的示例
@BeforeClass()
public static void initClass() throws SQLException {
createTable(tablenameArray, "c1 int primary key,c2 interval day(6) to second(5)");
createTable(tablenameStruct, " c1 int primary key,c2 interval year(4) to month");
createTable(array1, "c1 int");
createTable(array2, "c1 char(100)");
createTable(array3, "c1 date");
createTable(struct1, "c1 int");
createTable(struct2, "c1 varchar(100)");
createTable(struct3, "c1 date");
createTable(raw1, "c1 int ,c2 raw(100)");
createTable(refcursor1, "c1 varchar(20), c2 number");
}
public void showArrayRes(Array array) throws Exception {
ResultSet arrayRes = array.getResultSet();
while (arrayRes.next()) {
int index = arrayRes.getInt(1);
Struct struct = (Struct) arrayRes.getObject(2);
Object[] objArr = struct.getAttributes();
for (Object obj : objArr) {
System.out.printf("index j %d obj now is %s\n", index, obj);
}
}
}
public void executeSqls(String[] sqls, Connection conn) {
PreparedStatement ps;
for (String sql : sqls) {
try {
ps = conn.prepareStatement(sql);
ps.execute();
ps.close();
} catch (Exception e) {
System.out.println("sql:" + sql);
// ignore, maybe table does not exist
e.printStackTrace();
}
}
}
//示例 1
public void basicArrayAndStructTest() throws SQLException {
Assume.assumeTrue(sharedUsePrepare());
Connection conn = null;
try {
conn = sharedPSConnection;
PreparedStatement ps = null;
Statement stmt = conn.createStatement();
stmt.execute("CREATE OR REPLACE TYPE my_obj as object (c1 int, c3 date)");
stmt.execute("CREATE OR REPLACE TYPE obj_array IS TABLE OF my_obj");
// test input
String createPlSql = "CREATE OR REPLACE PROCEDURE my_proc_objarr(X IN obj_array) IS "
+ "BEGIN " + " FOR idx IN 1..X.count LOOP " + " INSERT INTO "
+ array1 + " VALUES(X(idx).c1);"
+ " END LOOP; "
// + " FOR idx IN 1..X.count LOOP" + " INSERT INTO " + array2
// + " VALUES(X(idx).c2);" + " END LOOP; "
+ " FOR idx IN 1..X.count LOOP" + " INSERT INTO " + array3
+ " VALUES(X(idx).c3);" + " END LOOP; " + "END;";
stmt.execute(createPlSql);
Integer[] intArray = new Integer[10];
for (int i = 0; i < 10; ++i) {
if (i % 2 == 0) {
intArray[i] = null;
} else {
intArray[i] = i;
}
}
// String[] strArray = new String[10];
// for (int i = 0; i < 10; ++i) {
// if (i % 2 == 0) {
// strArray[i] = "luyun_" + i;
// } else {
// strArray[i] = null;
// }
// }
java.sql.Timestamp[] dateArray = new Timestamp[10];
for (int i = 0; i < 10; ++i) {
if (i % 2 == 0) {
dateArray[i] = Timestamp.valueOf("2019-06-04 10:29:11.123456");
} else {
dateArray[i] = null;
}
}
Object[] structArray = new Object[10];
for (int i = 0; i < 10; ++i) {
structArray[i] = conn.createStruct("my_obj", new Object[] { intArray[i],
dateArray[i] });
// strArray[i], dateArray[i] });
}
Array array = conn.createArrayOf("my_obj", structArray);
// ((ArrayImpl)array).getComplexType().setTypeName("obj_array");
{
System.out.println("=======prepareStatement input test =============");
ps = conn.prepareStatement("call my_proc_objarr(?)");
ps.setArray(1, array);
ps.execute();
ps.close();
ps = conn.prepareStatement("select * from " + array1);
ResultSet rs = ps.executeQuery();
while (rs.next()) {
System.out.println(rs.getInt("c1"));
}
ps.close();
// ps = conn.prepareStatement("select * from " + array2);
// rs = ps.executeQuery();
// while (rs.next()) {
// System.out.println(rs.getString("c1"));
// }
// ps.close();
ps = conn.prepareStatement("select * from " + array3);
rs = ps.executeQuery();
while (rs.next()) {
System.out.println(rs.getDate("c1"));
}
ps.close();
}
{
System.out.println("=======callable Statement input test =============");
ps = conn.prepareCall("call my_proc_objarr(?)");
ps.setArray(1, array);
ps.execute();
ps.close();
ps = conn.prepareStatement("select * from " + array1);
ResultSet rs = ps.executeQuery();
while (rs.next()) {
System.out.println(rs.getInt("c1"));
}
ps.close();
// ps = conn.prepareStatement("select * from " + array2);
// rs = ps.executeQuery();
// while (rs.next()) {
// System.out.println(rs.getString("c1"));
// }
// ps.close();
ps = conn.prepareStatement("select * from " + array3);
rs = ps.executeQuery();
while (rs.next()) {
System.out.println(rs.getDate("c1"));
}
ps.close();
}
// test output
createPlSql = "CREATE OR REPLACE PROCEDURE my_proc_obj_out(x OUT obj_array) IS"
+ " i int :=1;" + " BEGIN" + " x.extend(10);" + " for idx in 1..5 loop"
// + " x(i).c1 := idx;" + " x(i).c2 := idx;"
+ " x(i).c1 := idx;" + " x(i).c3 := date '1970-01-01';"
+ " x(i + 1).c1 := null;"
// + " x(i + 1).c2 := null;" + " x(i + 1).c3 := null;"
+ " x(i + 1).c3 := null;" + " i := i + 2;" + " end loop;" + "END;";
{
stmt.execute(createPlSql);
ps = conn.prepareStatement("call my_proc_obj_out(?)");
ps.setArray(1, null);
ResultSet rs = ps.executeQuery();
while (rs.next()) {
Array resArray = rs.getArray(1);
showArrayRes(resArray);
}
}
// callable test
{
System.out.println("=========callable stmt test==========");
CallableStatement csmt = conn.prepareCall("{call my_proc_obj_out(?)}");
csmt.registerOutParameter(1, Types.ARRAY, "obj_array");
csmt.execute();
Array resArray = csmt.getArray(1);
showArrayRes(resArray);
}
} catch (Exception e) {
e.printStackTrace();
fail();
}
}
//示例 2
public void basicRawTest() throws SQLException {
Connection conn = null;
try {
conn = sharedPSConnection;
PreparedStatement ps = null;
ps = conn.prepareStatement("insert into " + raw1 + " values(?,?)");
ps.setInt(1, 11);
ps.setBytes(2, new byte[] { 1, 2, 3 });
ps.execute();
ps = conn.prepareStatement("select c1 ,c2 from " + raw1 + " where c1 = 11");
ResultSet rs = ps.executeQuery();
// Assert.assertEquals("[B", rs.getMetaData().getColumnClassName(2));
Assert.assertEquals("RAW", rs.getMetaData().getColumnTypeName(2));
Assert.assertEquals(-3, rs.getMetaData().getColumnType(2));
Assert.assertEquals(2, rs.getMetaData().getColumnCount());
Assert.assertEquals("C2", rs.getMetaData().getColumnLabel(2));
Assert.assertEquals(100, rs.getMetaData().getColumnDisplaySize(2));
Assert.assertEquals("UNITTESTS", rs.getMetaData().getCatalogName(2));
Assert.assertEquals("C2", rs.getMetaData().getColumnName(2));
Assert.assertEquals(0, rs.getMetaData().getScale(2));
Assert.assertEquals("TEST_RAW1", rs.getMetaData().getTableName(2));
// assertFalse(rs.getMetaData().isCaseSensitive(2));
assertTrue(rs.next());
Assert.assertEquals(11, rs.getInt(1));
Assert.assertTrue(Arrays.equals(new byte[] { 1, 2, 3 }, rs.getBytes(2)));
Assert.assertEquals("010203", rs.getString(2));
Assert.assertEquals(3, rs.getBinaryStream(2).available());
rs.close();
ps.close();
} catch (Exception e) {
e.printStackTrace();
fail();
}
}
//示例 3
public void testRefCursor() {
for (int loop = 0; loop < 2; loop++) {
Connection conn = sharedPSConnection;
{
{
String sql = "insert into " + refcursor1 + " values(?, ?)";
for (int i = 0; i < 10; i++) {
try {
PreparedStatement statement = conn.prepareStatement(sql);
statement.setString(1, "test" + i);
statement.setInt(2, i);
statement.execute();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
try {
String sql = "select * from " + refcursor1;
PreparedStatement statement = conn.prepareStatement(sql);
statement.execute();
ResultSet resultSet = statement.getResultSet();
while (resultSet.next()) {
int columnCnt = resultSet.getMetaData().getColumnCount();
for (int j = 1; j <= columnCnt; j++) {
System.out.println(resultSet.getMetaData().getColumnName(j) + ":"
+ resultSet.getString(j));
}
}
} catch (SQLException e) {
e.printStackTrace();
}
try {
Statement statement = conn.createStatement();
String createPlSql = "CREATE OR REPLACE PROCEDURE test_cursor(p_cursor OUT sys_refcursor) "
+ "is BEGIN "
+ " open p_cursor for select * from "
+ refcursor1 + ";" + "end;";
statement.execute(createPlSql);
CallableStatement csmt = conn.prepareCall("call test_cursor(?)",
ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
csmt.setFetchSize(10);
csmt.registerOutParameter(1, Types.REF);
csmt.execute();
ResultSet resultSet = (ResultSet) csmt.getObject(1);
resultSet.setFetchSize(2);
System.out.println("=========refcursor output==========");
while (resultSet.next()) {
int columnCnt = resultSet.getMetaData().getColumnCount();
for (int j = 1; j <= columnCnt; j++) {
System.out.println(resultSet.getMetaData().getColumnName(j) + ":"
+ resultSet.getString(j));
}
}
resultSet.close();
resultSet = (ResultSet) csmt.getObject(1);
System.out.println("=========refcursor output==========");
try {
while (resultSet.next()) {
int columnCnt = resultSet.getMetaData().getColumnCount();
for (int j = 1; j <= columnCnt; j++) {
System.out.println(resultSet.getMetaData().getColumnName(j) + ":"
+ resultSet.getString(j));
}
}
} catch (SQLException e) {
Assert.assertEquals(e.getErrorCode(), 600);
}
} catch (SQLException e) {
e.printStackTrace();
Assert.assertEquals(e.getMessage(), "cursor is not open");
}
}
}
}
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