Merge pull request #2946 from yffstart/mybatis-learn-branch

optimize DefaultParameterHandler create same MeteObject multiple times

Author: hazendaz

src/main/java/org/apache/ibatis/scripting/defaults/DefaultParameterHandler.java

@@ -63,6 +63,7 @@ public void setParameters(PreparedStatement ps) {
     ErrorContext.instance().activity("setting parameters").object(mappedStatement.getParameterMap().getId());
     List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
     if (parameterMappings != null) {
+      MetaObject metaObject = null;
       for (int i = 0; i < parameterMappings.size(); i++) {
         ParameterMapping parameterMapping = parameterMappings.get(i);
         if (parameterMapping.getMode() != ParameterMode.OUT) {
@@ -75,7 +76,9 @@ public void setParameters(PreparedStatement ps) {
           } else if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
             value = parameterObject;
           } else {
-            MetaObject metaObject = configuration.newMetaObject(parameterObject);
+            if (metaObject == null) {
+              metaObject = configuration.newMetaObject(parameterObject);
+            }
             value = metaObject.getValue(propertyName);
           }
           TypeHandler typeHandler = parameterMapping.getTypeHandler();

src/test/java/org/apache/ibatis/scripting/defaults/DefaultParameterHandlerTest.java

@@ -20,6 +20,8 @@
 import static org.mockito.Mockito.doThrow;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.times;
 
 import java.sql.PreparedStatement;
 import java.sql.SQLException;
@@ -29,6 +31,8 @@
 import java.util.List;
 
 import org.apache.ibatis.builder.StaticSqlSource;
+import org.apache.ibatis.domain.blog.Author;
+import org.apache.ibatis.domain.blog.Section;
 import org.apache.ibatis.mapping.BoundSql;
 import org.apache.ibatis.mapping.MappedStatement;
 import org.apache.ibatis.mapping.ParameterMapping;
@@ -98,4 +102,35 @@ MappedStatement getMappedStatement() {
         }).build();
   }
 
+  @Test
+  void testParameterObjectMetaObjectGetValue() {
+    Configuration config = new Configuration();
+    TypeHandlerRegistry registry = config.getTypeHandlerRegistry();
+
+    MappedStatement mappedStatement = new MappedStatement.Builder(config, "testSelect", new StaticSqlSource(config, "some select statement"), SqlCommandType.SELECT).build();
+
+    Author parameterObject = mock(Author.class);
+
+    BoundSql boundSql = new BoundSql(config, "some select statement", new ArrayList<ParameterMapping>() {
+      {
+        add(new ParameterMapping.Builder(config, "username", registry.getTypeHandler(String.class)).build());
+        add(new ParameterMapping.Builder(config, "password", registry.getTypeHandler(String.class)).build());
+        add(new ParameterMapping.Builder(config, "email", registry.getTypeHandler(String.class)).build());
+        add(new ParameterMapping.Builder(config, "bio", registry.getTypeHandler(String.class)).jdbcType(JdbcType.VARCHAR).build());
+        add(new ParameterMapping.Builder(config, "favouriteSection", registry.getTypeHandler(Section.class)).jdbcType(JdbcType.VARCHAR).build());
+      }
+    }, parameterObject);
+
+    DefaultParameterHandler defaultParameterHandler = new DefaultParameterHandler(mappedStatement, parameterObject, boundSql);
+
+    PreparedStatement ps = mock(PreparedStatement.class);
+
+    defaultParameterHandler.setParameters(ps);
+
+    verify(parameterObject, times(1)).getUsername();
+    verify(parameterObject, times(1)).getPassword();
+    verify(parameterObject, times(1)).getEmail();
+    verify(parameterObject, times(1)).getBio();
+    verify(parameterObject, times(1)).getFavouriteSection();
+  }
 }