Related to #25. Ensure selectKey returns one value.

Author: emacarron

src/main/java/org/apache/ibatis/executor/keygen/SelectKeyGenerator.java

@@ -60,10 +60,12 @@ private void processGeneratedKeys(Executor executor, MappedStatement ms, Object
           // The transaction will be closed by parent executor.
           Executor keyExecutor = configuration.newExecutor(executor.getTransaction(), ExecutorType.SIMPLE);
           List<Object> values = keyExecutor.query(keyStatement, parameter, RowBounds.DEFAULT, Executor.NO_RESULT_HANDLER);
-          if (values.size() == 1) {
-            metaParam.setValue(keyProperty, values.get(0));
+          if (values.size() == 0) {
+            throw new ExecutorException("SelectKey returned no data.");            
           } else if (values.size() > 1) {
-            throw new ExecutorException("Select statement for SelectKeyGenerator returned more than one value.");
+            throw new ExecutorException("SelectKey returned more than one value.");
+          } else {
+            metaParam.setValue(keyProperty, values.get(0));
           }
         }
       }

src/test/java/org/apache/ibatis/submitted/selectkey/SelectKeyTest.java

@@ -15,6 +15,7 @@
  */
 package org.apache.ibatis.submitted.selectkey;
 
+import org.apache.ibatis.exceptions.PersistenceException;
 import org.apache.ibatis.io.Resources;
 import org.apache.ibatis.jdbc.ScriptRunner;
 import org.apache.ibatis.session.SqlSession;
@@ -108,22 +109,33 @@ public void testInsertTable2() {
     }
   }
 
-  @Test
-  public void testInsertTable3() {
+  @Test(expected=PersistenceException.class)
+  public void testSeleckKeyReturnsNoData() {
     SqlSession sqlSession = sqlSessionFactory.openSession();
-
     try {
       Map<String, String> parms = new HashMap<String, String>();
       parms.put("name", "Fred");
       int rows = sqlSession.insert("org.apache.ibatis.submitted.selectkey.Table2.insertNoValuesInSelectKey", parms);
       assertEquals(1, rows);
       assertNull(parms.get("id"));
+    } finally {
+      sqlSession.close();
+    }
+  }
 
+  @Test(expected=PersistenceException.class)
+  public void testSeleckKeyReturnsTooManyData() {
+    SqlSession sqlSession = sqlSessionFactory.openSession();
+    try {
+      Map<String, String> parms = new HashMap<String, String>();
+      parms.put("name", "Fred");
+      sqlSession.insert("org.apache.ibatis.submitted.selectkey.Table2.insertTooManyValuesInSelectKey", parms);
+      sqlSession.insert("org.apache.ibatis.submitted.selectkey.Table2.insertTooManyValuesInSelectKey", parms);
     } finally {
       sqlSession.close();
     }
   }
-  
+
   @Test
   public void testAnnotatedInsertTable2() {
       SqlSession sqlSession = sqlSessionFactory.openSession();

src/test/java/org/apache/ibatis/submitted/selectkey/Table2.xml

@@ -31,5 +31,12 @@
       select * from table2 where name = 'xxx'
     </selectKey>
   </insert>
+
+  <insert id="insertTooManyValuesInSelectKey" parameterType="map">
+    insert into table2 (name) values (#{name})
+    <selectKey resultType="java.lang.Integer" keyProperty="id">
+      select id from table2
+    </selectKey>
+  </insert>
 
 </mapper>