#882 Implement DatabaseMetaData informational methods to report schema support

Author: mrotteveel

src/main/org/firebirdsql/jdbc/FBDatabaseMetaData.java

@@ -764,12 +764,11 @@ public boolean supportsLimitedOuterJoins() throws SQLException {
     /**
      * {@inheritDoc}
      *
-     * @return the vendor term, always {@code null} because schemas are not supported by database server (see JDBC CTS
-     * for details).
+     * @return the vendor term; for Firebird 5.0 and older always {@code null} because schemas are not supported
      */
     @Override
     public String getSchemaTerm() throws SQLException {
-        return null;
+        return firebirdSupportInfo.supportsSchemas() ? "SCHEMA" : null;
     }
 
     @Override
@@ -814,27 +813,27 @@ public String getCatalogSeparator() throws SQLException {
 
     @Override
     public boolean supportsSchemasInDataManipulation() throws SQLException {
-        return false;
+        return firebirdSupportInfo.supportsSchemas();
     }
 
     @Override
     public boolean supportsSchemasInProcedureCalls() throws SQLException {
-        return false;
+        return firebirdSupportInfo.supportsSchemas();
     }
 
     @Override
     public boolean supportsSchemasInTableDefinitions() throws SQLException {
-        return false;
+        return firebirdSupportInfo.supportsSchemas();
     }
 
     @Override
     public boolean supportsSchemasInIndexDefinitions() throws SQLException {
-        return false;
+        return firebirdSupportInfo.supportsSchemas();
     }
 
     @Override
     public boolean supportsSchemasInPrivilegeDefinitions() throws SQLException {
-        return false;
+        return firebirdSupportInfo.supportsSchemas();
     }
 
     /**
@@ -1031,7 +1030,7 @@ public int getMaxIndexLength() throws SQLException {
 
     @Override
     public int getMaxSchemaNameLength() throws SQLException {
-        return 0; //No schemas
+        return firebirdSupportInfo.supportsSchemas() ? getMaxObjectNameLength() : 0;
     }
 
     /**

src/test/org/firebirdsql/jdbc/FBDatabaseMetaDataTest.java

@@ -9,6 +9,7 @@
 
 import org.firebirdsql.common.DdlHelper;
 import org.firebirdsql.common.extension.UsesDatabaseExtension;
+import org.firebirdsql.util.FirebirdSupportInfo;
 import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
@@ -809,6 +810,32 @@ void testGetIdentifierQuoteString_dialect3Db(String connectionDialect, String ex
         }
     }
 
+    @Test
+    void testGetSchemaTerm() throws Exception {
+        final String expected = getDefaultSupportInfo().supportsSchemas() ? "SCHEMA" : null;
+        assertEquals(expected, dmd.getSchemaTerm(), "schemaTerm");
+    }
+
+    @Test
+    void testGetMaxSchemaNameLength() throws Exception {
+        FirebirdSupportInfo supportInfo = getDefaultSupportInfo();
+        final int expected = getDefaultSupportInfo().supportsSchemas()
+                ? supportInfo.maxIdentifierLengthCharacters() : 0;
+        assertEquals(expected, dmd.getMaxSchemaNameLength(), "maxSchemaNameLength");
+    }
+
+    @Test
+    void testSupportsSchemasInXXX() {
+        final boolean expected = getDefaultSupportInfo().supportsSchemas();
+        assertAll(
+                () -> assertEquals(expected, dmd.supportsSchemasInDataManipulation(), "DataManipulation"),
+                () -> assertEquals(expected, dmd.supportsSchemasInIndexDefinitions(), "IndexDefinitions"),
+                () -> assertEquals(expected, dmd.supportsSchemasInPrivilegeDefinitions(), "PrivilegeDefinitions"),
+                () -> assertEquals(expected, dmd.supportsSchemasInProcedureCalls(), "ProcedureCalls"),
+                () -> assertEquals(expected, dmd.supportsSchemasInTableDefinitions(), "TableDefinitions")
+        );
+    }
+
     @SuppressWarnings("SameParameterValue")
     private void createPackage(String packageName, String procedureName) throws Exception {
         try (Statement stmt = connection.createStatement()) {