Add duplicate column detection in EntityProvider

doma-core/src/main/java/org/seasar/doma/internal/jdbc/command/EntityProvider.java

@@ -27,6 +27,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import org.seasar.doma.jdbc.DuplicateColumnHandler;
 import org.seasar.doma.jdbc.JdbcMappingVisitor;
 import org.seasar.doma.jdbc.Naming;
 import org.seasar.doma.jdbc.ResultMappingException;
@@ -49,6 +50,8 @@ public class EntityProvider<ENTITY> extends AbstractObjectProvider<ENTITY> {
 
   protected final UnknownColumnHandler unknownColumnHandler;
 
+  protected final DuplicateColumnHandler duplicateColumnHandler;
+
   protected Map<Integer, EntityPropertyType<ENTITY, ?>> indexMap;
 
   public EntityProvider(EntityType<ENTITY> entityType, Query query, boolean resultMappingEnsured) {
@@ -58,6 +61,7 @@ public EntityProvider(EntityType<ENTITY> entityType, Query query, boolean result
     this.resultMappingEnsured = resultMappingEnsured;
     this.jdbcMappingVisitor = query.getConfig().getDialect().getJdbcMappingVisitor();
     this.unknownColumnHandler = query.getConfig().getUnknownColumnHandler();
+    this.duplicateColumnHandler = query.getConfig().getDuplicateColumnHandler();
   }
 
   @Override
@@ -91,10 +95,14 @@ protected ENTITY build(ResultSet resultSet) throws SQLException {
     HashMap<String, EntityPropertyType<ENTITY, ?>> columnNameMap = createColumnNameMap(entityType);
     Set<EntityPropertyType<ENTITY, ?>> unmappedPropertySet =
         resultMappingEnsured ? new HashSet<>(columnNameMap.values()) : new HashSet<>();
+    Set<String> seenColumnNames = new HashSet<>();
     int count = resultSetMeta.getColumnCount();
     for (int i = 1; i < count + 1; i++) {
       String columnName = resultSetMeta.getColumnLabel(i);
       String lowerCaseColumnName = columnName.toLowerCase();
+      if (!seenColumnNames.add(lowerCaseColumnName)) {
+        duplicateColumnHandler.handle(query, columnName);
+      }
       EntityPropertyType<ENTITY, ?> propertyType = columnNameMap.get(lowerCaseColumnName);
       if (propertyType == null) {
         if (ROWNUMBER_COLUMN_NAME.equals(lowerCaseColumnName)) {

doma-core/src/main/java/org/seasar/doma/jdbc/Config.java

@@ -141,6 +141,15 @@ default UnknownColumnHandler getUnknownColumnHandler() {
     return ConfigSupport.defaultUnknownColumnHandler;
   }
 
+  /**
+   * Returns the duplicate column handler.
+   *
+   * @return the duplicate column handler
+   */
+  default DuplicateColumnHandler getDuplicateColumnHandler() {
+    return ConfigSupport.defaultDuplicateColumnHandler;
+  }
+
   /**
    * Returns the naming convention controller.
    *

doma-core/src/main/java/org/seasar/doma/jdbc/ConfigSupport.java

@@ -40,6 +40,9 @@ public final class ConfigSupport {
   public static final UnknownColumnHandler defaultUnknownColumnHandler =
       new UnknownColumnHandler() {};
 
+  public static final DuplicateColumnHandler defaultDuplicateColumnHandler =
+      new DuplicateColumnHandler() {};
+
   public static final Naming defaultNaming = Naming.DEFAULT;
 
   public static final MapKeyNaming defaultMapKeyNaming = new MapKeyNaming() {};

doma-core/src/main/java/org/seasar/doma/jdbc/DuplicateColumnException.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright Doma Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.seasar.doma.jdbc;
+
+import org.seasar.doma.message.Message;
+
+/** Thrown to indicate that a column is duplicated in a result set. */
+public class DuplicateColumnException extends JdbcException {
+
+  private static final long serialVersionUID = 1L;
+
+  protected final String columnName;
+
+  protected final String rawSql;
+
+  protected final String formattedSql;
+
+  protected final String sqlFilePath;
+
+  public DuplicateColumnException(
+      SqlLogType logType,
+      String columnName,
+      String rawSql,
+      String formattedSql,
+      String sqlFilePath) {
+    super(Message.DOMA2237, columnName, sqlFilePath, choiceSql(logType, rawSql, formattedSql));
+    this.columnName = columnName;
+    this.rawSql = rawSql;
+    this.formattedSql = formattedSql;
+    this.sqlFilePath = sqlFilePath;
+  }
+
+  /**
+   * Returns the unknown column name.
+   *
+   * @return the unknown column name
+   */
+  public String getColumnName() {
+    return columnName;
+  }
+
+  /**
+   * Returns the raw SQL string.
+   *
+   * @return the raw SQL string
+   */
+  public String getRawSql() {
+    return rawSql;
+  }
+
+  /**
+   * Returns the formatted SQL string
+   *
+   * @return the formatted SQL or {@code null} if this exception is thrown in the batch process
+   */
+  public String getFormattedSql() {
+    return formattedSql;
+  }
+
+  /**
+   * Returns the SQL file path.
+   *
+   * @return the SQL file path or {@code null} if the SQL is auto generated
+   */
+  public String getSqlFilePath() {
+    return sqlFilePath;
+  }
+}

doma-core/src/main/java/org/seasar/doma/jdbc/DuplicateColumnHandler.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright Doma Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.seasar.doma.jdbc;
+
+import org.seasar.doma.jdbc.query.Query;
+
+/** A handler for the column that is duplicated in a result set. */
+public interface DuplicateColumnHandler {
+
+  /**
+   * Handles the duplicate column.
+   *
+   * @param query the query
+   * @param duplicateColumnName the name of the unknown column
+   */
+  default void handle(Query query, String duplicateColumnName) {}
+}

doma-core/src/main/java/org/seasar/doma/jdbc/ThrowingDuplicateColumnHandler.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright Doma Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.seasar.doma.jdbc;
+
+import org.seasar.doma.jdbc.query.Query;
+
+/** A handler for the column that is duplicated in a result set. */
+public class ThrowingDuplicateColumnHandler implements DuplicateColumnHandler {
+
+  /**
+   * Handles the duplicate column.
+   *
+   * @param query the query
+   * @param duplicateColumnName the name of the duplicate column
+   * @throws DuplicateColumnException if this handler does not allow the duplicate column
+   */
+  @Override
+  public void handle(Query query, String duplicateColumnName) {
+    Sql<?> sql = query.getSql();
+    throw new DuplicateColumnException(
+        query.getConfig().getExceptionSqlLogType(),
+        duplicateColumnName,
+        sql.getRawSql(),
+        sql.getFormattedSql(),
+        sql.getSqlFilePath());
+  }
+}

doma-core/src/main/java/org/seasar/doma/message/Message.java

@@ -274,6 +274,9 @@ public enum Message implements MessageResource {
   DOMA2235("The dialect \"{0}\" does not support auto-increment when inserting multiple rows."),
 
   DOMA2236("The dialect \"{0}\" does not support multi-row insert statement."),
+  DOMA2237(
+      "Duplicate column name \"{0}\" found in ResultSetMetaData. Column names must be unique."
+          + "\nPATH=[{1}].\nSQL=[{2}]"),
 
   // expression
   DOMA3001(

doma-core/src/test/java/org/seasar/doma/internal/jdbc/command/EntityProviderTest.java

@@ -15,13 +15,15 @@
  */
 package org.seasar.doma.internal.jdbc.command;
 
+import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.fail;
 import static org.seasar.doma.internal.util.AssertionUtil.assertEquals;
 
 import example.entity.Emp;
 import example.entity._Emp;
 import java.lang.reflect.Method;
 import java.math.BigDecimal;
+import java.sql.SQLException;
 import java.util.Collections;
 import org.junit.jupiter.api.Test;
 import org.seasar.doma.FetchType;
@@ -31,10 +33,13 @@
 import org.seasar.doma.internal.jdbc.mock.MockResultSetMetaData;
 import org.seasar.doma.internal.jdbc.mock.RowData;
 import org.seasar.doma.jdbc.Config;
+import org.seasar.doma.jdbc.DuplicateColumnException;
+import org.seasar.doma.jdbc.DuplicateColumnHandler;
 import org.seasar.doma.jdbc.PreparedSql;
 import org.seasar.doma.jdbc.SelectOptions;
 import org.seasar.doma.jdbc.SqlKind;
 import org.seasar.doma.jdbc.SqlLogType;
+import org.seasar.doma.jdbc.ThrowingDuplicateColumnHandler;
 import org.seasar.doma.jdbc.UnknownColumnException;
 import org.seasar.doma.jdbc.UnknownColumnHandler;
 import org.seasar.doma.jdbc.entity.EntityType;
@@ -111,6 +116,46 @@ public void testGetEntity_EmptyUnknownColumnHandler() throws Exception {
     assertEquals(100, emp.getVersion());
   }
 
+  @Test
+  public void testCreateIndexMap_DuplicateColumnNameException() throws SQLException {
+    MockResultSetMetaData metaData = new MockResultSetMetaData();
+    metaData.columns.add(new ColumnMetaData("id"));
+    metaData.columns.add(new ColumnMetaData("name"));
+    metaData.columns.add(new ColumnMetaData("name")); // Duplicate column name
+    metaData.columns.add(new ColumnMetaData("version"));
+    MockResultSet resultSet = new MockResultSet(metaData);
+    resultSet.rows.add(new RowData(1, "aaa", "bbb", 100));
+    resultSet.next();
+
+    _Emp entityType = _Emp.getSingletonInternal();
+    EntityProvider<Emp> provider =
+        new EntityProvider<>(entityType, new MySelectQuery(new MockConfig()), false);
+
+    provider.createIndexMap(metaData, entityType);
+    Emp emp = provider.get(resultSet);
+
+    assertEquals(1, emp.getId());
+    assertEquals("bbb", emp.getName());
+    assertEquals(100, emp.getVersion());
+  }
+
+  @Test
+  public void testCreateIndexMap_DuplicateColumnHandler() throws SQLException {
+    MockResultSetMetaData metaData = new MockResultSetMetaData();
+    metaData.columns.add(new ColumnMetaData("id"));
+    metaData.columns.add(new ColumnMetaData("name"));
+    metaData.columns.add(new ColumnMetaData("name")); // Duplicate column name
+    metaData.columns.add(new ColumnMetaData("version"));
+
+    _Emp entityType = _Emp.getSingletonInternal();
+    EntityProvider<Emp> provider =
+        new EntityProvider<>(
+            entityType, new MySelectQuery(new SetDuplicateColumnHandlerConfig()), false);
+
+    assertThrows(
+        DuplicateColumnException.class, () -> provider.createIndexMap(metaData, entityType));
+  }
+
   protected static class MySelectQuery implements SelectQuery {
 
     private final Config config;
@@ -213,4 +258,11 @@ public UnknownColumnHandler getUnknownColumnHandler() {
       return new EmptyUnknownColumnHandler();
     }
   }
+
+  protected static class SetDuplicateColumnHandlerConfig extends MockConfig {
+    @Override
+    public DuplicateColumnHandler getDuplicateColumnHandler() {
+      return new ThrowingDuplicateColumnHandler();
+    }
+  }
 }

doma-core/src/test/java/org/seasar/doma/jdbc/DuplicateColumnExceptionTest.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright Doma Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.seasar.doma.jdbc;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+public class DuplicateColumnExceptionTest {
+
+  @Test
+  public void test() {
+    DuplicateColumnException e =
+        new DuplicateColumnException(SqlLogType.FORMATTED, "aaa", "bbb", "ccc", "ddd");
+    System.out.println(e.getMessage());
+    assertEquals("aaa", e.getColumnName());
+    assertEquals("bbb", e.getRawSql());
+    assertEquals("ccc", e.getFormattedSql());
+    assertEquals("ddd", e.getSqlFilePath());
+  }
+}