增加createCriteria的静态方法和测试用例

README.md

@@ -282,6 +282,7 @@ public class Test {
 * Example增强了setOrderByClause方法，新增orderBy(String orderByClause)方法直接返回example，增强链式调用，可以一路.下去了。
 * 继续增强orderBy(String orderByClause)方法，增加orderBy(String ... orderByClauses)方法，配合数据Model属性对应Column获取插件（ModelColumnPlugin）使用效果更佳。 
 * 增加基于column的操作，当配置了[数据Model属性对应Column获取插件（ModelColumnPlugin）](#8-数据model属性对应column获取插件)插件时，提供column之间的比对操作。  
+* 增加createCriteria静态方法newAndCreateCriteria简写example的创建。
 
 插件：
 ```xml
@@ -369,6 +370,19 @@ public class Test {
                 .andField1LessThanOrEqualToColumn(Tb.Column.field2) // where field1 <= field2
                 .example()
         );
+        
+        // ---------------------------- static createCriteria  -----------------------
+        // simple
+        this.tbMapper.selectByExample(
+                new TbExample()
+                .createCriteria()
+                .example()
+        );
+        // new
+        this.tbMapper.selectByExample(
+                TbExample.newAndCreateCriteria()
+                .example()
+        );
     }
 }
 ```

src/main/java/com/itfsw/mybatis/generator/plugins/ExampleEnhancedPlugin.java

@@ -22,6 +22,8 @@ import java.util.List;
  * ---------------------------------------------------------------------------
  */
 public class ExampleEnhancedPlugin extends BasePlugin {
+    public static final String METHOD_NEW_AND_CREATE_CRITERIA = "newAndCreateCriteria";   // newAndCreateCriteria 方法
+
     private boolean enableColumnOperate = false;    // 是否启用column的操作
 
     /**
@@ -67,11 +69,34 @@ public class ExampleEnhancedPlugin extends BasePlugin {
         }
 
         // orderBy方法
-        addOrderByMethodToExample(topLevelClass, introspectedTable);
+        this.addOrderByMethodToExample(topLevelClass, introspectedTable);
+
+        // createCriteria 静态方法
+        this.addStaticCreateCriteriaMethodToExample(topLevelClass, introspectedTable);
 
         return true;
     }
 
+    /**
+     * 添加 createCriteria 静态方法
+     * @param topLevelClass
+     * @param introspectedTable
+     */
+    private void addStaticCreateCriteriaMethodToExample(TopLevelClass topLevelClass, IntrospectedTable introspectedTable) {
+        Method createCriteriaMethod = JavaElementGeneratorTools.generateMethod(
+                METHOD_NEW_AND_CREATE_CRITERIA,
+                JavaVisibility.PUBLIC,
+                FullyQualifiedJavaType.getCriteriaInstance()
+        );
+        commentGenerator.addGeneralMethodComment(createCriteriaMethod, introspectedTable);
+
+        createCriteriaMethod.setStatic(true);
+        createCriteriaMethod.addBodyLine(topLevelClass.getType().getShortName() + " example = new " + topLevelClass.getType().getShortName() + "();");
+        createCriteriaMethod.addBodyLine("return example.createCriteria();");
+
+        FormatTools.addMethodWithBestPosition(topLevelClass, createCriteriaMethod);
+    }
+
     /**
      * 添加列操作方法
      * @param topLevelClass

src/test/java/com/itfsw/mybatis/generator/plugins/ExampleEnhancedPluginTest.java

@@ -88,6 +88,27 @@ public class ExampleEnhancedPluginTest {
         });
     }
 
+    /**
+     * 测试静态 createCriteria
+     * @throws Exception
+     */
+    @Test
+    public void testStaticCreateCriteria() throws Exception{
+        MyBatisGeneratorTool tool = MyBatisGeneratorTool.create("scripts/ExampleEnhancedPlugin/mybatis-generator.xml");
+        tool.generate(new AbstractShellCallback() {
+            @Override
+            public void reloadProject(SqlSession sqlSession, ClassLoader loader, String packagz) throws Exception {
+                ObjectUtil tbMapper = new ObjectUtil(sqlSession.getMapper(loader.loadClass(packagz + ".TbMapper")));
+
+                ObjectUtil tbExampleCriteria = new ObjectUtil(loader.loadClass(packagz + ".TbExample").getMethod(ExampleEnhancedPlugin.METHOD_NEW_AND_CREATE_CRITERIA).invoke(null));
+
+                // 调用example方法能正常返回
+                String sql = SqlHelper.getFormatMapperSql(tbMapper.getObject(), "selectByExample", tbExampleCriteria.invoke("example"));
+                Assert.assertEquals(sql, "select id, field1, field2 from tb");
+            }
+        });
+    }
+
     /**
      * 测试andIf方法
      */