Add all() methods to the helpers

Author: jeffgbutler

src/main/java/org/mybatis/dynamic/sql/util/mybatis3/MyBatis3CountByExampleHelper.java

@@ -47,15 +47,30 @@
  *         q.where(occupation, isNull()));
  * </pre>
  * 
- * <p>You can also do a "count all" with the following code:
+ * <p>You can implement a "count all" with the following code:
  * 
  * <pre>
  * long rows = mapper.countByExample(q -&gt; q);
  * </pre>
+ * 
+ * <p>Or
+ * 
+ * <pre>
+ * long rows = mapper.countByExample(MyBatis3CountByExampleHelper.all());
+ * </pre>
  *  
  * @author Jeff Butler
  */
 @FunctionalInterface
 public interface MyBatis3CountByExampleHelper extends
         Function<QueryExpressionDSL<MyBatis3SelectModelAdapter<Long>>, Buildable<MyBatis3SelectModelAdapter<Long>>> {
+    
+    /**
+     * Returns a helper that can be used to count every row in a table.
+     * 
+     * @return the helper that will count every row in a table
+     */
+    static MyBatis3CountByExampleHelper all() {
+        return h -> h;
+    }
 }

src/main/java/org/mybatis/dynamic/sql/util/mybatis3/MyBatis3DeleteByExampleHelper.java

@@ -46,15 +46,30 @@
  *           q.where(occupation, isNull()));
  * </pre>
  *  
- * <p>You can also do a "delete all" with the following code:
+ * <p>You can implement a "delete all" with the following code:
  * 
  * <pre>
  * int rows = mapper.deleteByExample(q -&gt; q);
  * </pre>
  * 
+ * <p>Or
+ * 
+ * <pre>
+ * long rows = mapper.deleteByExample(MyBatis3DeleteByExampleHelper.all());
+ * </pre>
+
  * @author Jeff Butler
  */
 @FunctionalInterface
 public interface MyBatis3DeleteByExampleHelper extends
         Function<DeleteDSL<MyBatis3DeleteModelAdapter<Integer>>, Buildable<MyBatis3DeleteModelAdapter<Integer>>> {
+
+    /**
+     * Returns a helper that can be used to delete every row in a table.
+     * 
+     * @return the helper that will delete every row in a table
+     */
+    static MyBatis3DeleteByExampleHelper all() {
+        return h -> h;
+    }
 }

src/main/java/org/mybatis/dynamic/sql/util/mybatis3/MyBatis3SelectByExampleHelper.java

@@ -57,16 +57,31 @@
  *     .or(occupation, isNull()));
  * </pre>
  *  
- * <p>You can also do a "select all" with the following code:
+ * <p>You can implement a "select all" with the following code:
  * 
  * <pre>
  * List&lt;SimpleRecord&gt; rows = mapper.selectByExample(q -&gt; q);
  * </pre>
  * 
+ * <p>Or
+ * 
+ * <pre>
+ * List&lt;SimpleRecord&gt; rows = mapper.selectByExample(MyBatis3SelectByExampleHelper.all());
+ * </pre>
+ * 
  * @author Jeff Butler
  */
 @FunctionalInterface
 public interface MyBatis3SelectByExampleHelper<T> extends
         Function<QueryExpressionDSL<MyBatis3SelectModelAdapter<List<T>>>,
         Buildable<MyBatis3SelectModelAdapter<List<T>>>> {
+
+    /**
+     * Returns a helper that can be used to select every row in a table.
+     * 
+     * @return the helper that will select every row in a table
+     */
+    static <T> MyBatis3SelectByExampleHelper<T> all() {
+        return h -> h;
+    }
 }

src/main/java/org/mybatis/dynamic/sql/util/mybatis3/MyBatis3UpdateByExampleHelper.java

@@ -53,15 +53,30 @@
  *                .and(firstName, isEqualTo("Joe")));
  * </pre>
  *  
- * <p>You can also do an "update all" with the following code:
+ * <p>You can implement an "update all" with the following code:
  * 
  * <pre>
  * int rows = mapper.updateByExampleSelective(record, q -&gt; q);
  * </pre>
  * 
+ * <p>Or
+ * 
+ * <pre>
+ * int rows = mapper.updateByExampleSelective(record, MyBatis3UpdateByExampleHelper.all());
+ * </pre>
+ * 
  * @author Jeff Butler
  */
 @FunctionalInterface
 public interface MyBatis3UpdateByExampleHelper extends
         Function<UpdateDSL<MyBatis3UpdateModelAdapter<Integer>>, Buildable<MyBatis3UpdateModelAdapter<Integer>>> {
+
+    /**
+     * Returns a helper that can be used to update every row in a table.
+     * 
+     * @return the helper that will update every row in a table
+     */
+    static MyBatis3UpdateByExampleHelper all() {
+        return h -> h;
+    }
 }

src/test/java/examples/simple/SimpleTableAnnotatedNewStyleMapperTest.java

@@ -38,6 +38,10 @@
 import org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.mybatis.dynamic.sql.util.mybatis3.MyBatis3CountByExampleHelper;
+import org.mybatis.dynamic.sql.util.mybatis3.MyBatis3DeleteByExampleHelper;
+import org.mybatis.dynamic.sql.util.mybatis3.MyBatis3SelectByExampleHelper;
+import org.mybatis.dynamic.sql.util.mybatis3.MyBatis3UpdateByExampleHelper;
 
 public class SimpleTableAnnotatedNewStyleMapperTest {
 
@@ -81,7 +85,7 @@ public void testSelectAll() {
         try (SqlSession session = sqlSessionFactory.openSession()) {
             SimpleTableAnnotatedMapperNewStyle mapper = session.getMapper(SimpleTableAnnotatedMapperNewStyle.class);
 
-            List<SimpleTableRecord> rows = mapper.selectByExample(q -> q);
+            List<SimpleTableRecord> rows = mapper.selectByExample(MyBatis3SelectByExampleHelper.all());
 
             assertThat(rows.size()).isEqualTo(6);
         }
@@ -147,7 +151,7 @@ public void testDeleteByExample() {
     public void testDeleteAll() {
         try (SqlSession session = sqlSessionFactory.openSession()) {
             SimpleTableAnnotatedMapperNewStyle mapper = session.getMapper(SimpleTableAnnotatedMapperNewStyle.class);
-            int rows = mapper.deleteByExample(d -> d);
+            int rows = mapper.deleteByExample(MyBatis3DeleteByExampleHelper.all());
 
             assertThat(rows).isEqualTo(6);
         }
@@ -323,7 +327,7 @@ public void testUpdateAll() {
 
             record = new SimpleTableRecord();
             record.setOccupation("Programmer");
-            rows = mapper.updateByExampleSelective(q -> q).usingRecord(record);
+            rows = mapper.updateByExampleSelective(MyBatis3UpdateByExampleHelper.all()).usingRecord(record);
 
             assertThat(rows).isEqualTo(7);
 
@@ -347,7 +351,7 @@ public void testCountByExample() {
     public void testCountAll() {
         try (SqlSession session = sqlSessionFactory.openSession()) {
             SimpleTableAnnotatedMapperNewStyle mapper = session.getMapper(SimpleTableAnnotatedMapperNewStyle.class);
-            long rows = mapper.countByExample(q -> q);
+            long rows = mapper.countByExample(MyBatis3CountByExampleHelper.all());
 
             assertThat(rows).isEqualTo(6L);
         }