should create article success

src/main/java/io/spring/infrastructure/article/ArticleMapper.java

@@ -0,0 +1,21 @@
+package io.spring.infrastructure.article;
+
+import io.spring.core.article.Article;
+import io.spring.core.article.Tag;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+import org.springframework.stereotype.Component;
+
+@Component
+@Mapper
+public interface ArticleMapper {
+    void insert(@Param("article") Article article);
+
+    Article findById(@Param("id") String id);
+
+    boolean findTag(@Param("tagName") String tagName);
+
+    void insertTag(@Param("tag") Tag tag);
+
+    void insertArticleTagRelation(@Param("articleId") String articleId, @Param("tagId") String tagId);
+}

src/main/java/io/spring/infrastructure/article/MyBatisArticleRepository.java

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+package io.spring.infrastructure.article;
+
+import io.spring.core.article.Article;
+import io.spring.core.article.ArticleRepository;
+import io.spring.core.article.Tag;
+import org.springframework.stereotype.Repository;
+
+import java.util.Optional;
+
+@Repository
+public class MyBatisArticleRepository implements ArticleRepository {
+    private ArticleMapper articleMapper;
+
+    public MyBatisArticleRepository(ArticleMapper articleMapper) {
+        this.articleMapper = articleMapper;
+    }
+
+    @Override
+    public String toSlug(String title) {
+        return title.toLowerCase().replace(' ', '-');
+    }
+
+    @Override
+    public void save(Article article) {
+        articleMapper.insert(article);
+        for (Tag tag : article.getTags()) {
+            if (!articleMapper.findTag(tag.getName())) {
+                articleMapper.insertTag(tag);
+            }
+            articleMapper.insertArticleTagRelation(article.getId(), tag.getId());
+        }
+    }
+
+    @Override
+    public Optional<Article> findById(String id) {
+        return Optional.ofNullable(articleMapper.findById(id));
+    }
+}

src/main/java/io/spring/infrastructure/mybatis/DateTimeHandler.java

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+package io.spring.infrastructure.mybatis;
+
+import org.apache.ibatis.type.JdbcType;
+import org.apache.ibatis.type.MappedTypes;
+import org.apache.ibatis.type.TypeHandler;
+import org.joda.time.DateTime;
+
+import java.sql.CallableStatement;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Timestamp;
+import java.util.Calendar;
+import java.util.TimeZone;
+
+@MappedTypes(DateTime.class)
+public class DateTimeHandler implements TypeHandler<DateTime> {
+
+    private static final Calendar UTC_CALENDAR = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
+
+    @Override
+    public void setParameter(PreparedStatement ps, int i, DateTime parameter, JdbcType jdbcType) throws SQLException {
+        ps.setTimestamp(i, parameter != null ? new Timestamp(parameter.getMillis()) : null, UTC_CALENDAR);
+    }
+
+    @Override
+    public DateTime getResult(ResultSet rs, String columnName) throws SQLException {
+        Timestamp timestamp = rs.getTimestamp(columnName, UTC_CALENDAR);
+        return timestamp != null ? new DateTime(timestamp.getTime()) : null;
+    }
+
+    @Override
+    public DateTime getResult(ResultSet rs, int columnIndex) throws SQLException {
+        Timestamp timestamp = rs.getTimestamp(columnIndex, UTC_CALENDAR);
+        return timestamp != null ? new DateTime(timestamp.getTime()) : null;
+    }
+
+    @Override
+    public DateTime getResult(CallableStatement cs, int columnIndex) throws SQLException {
+        Timestamp ts = cs.getTimestamp(columnIndex, UTC_CALENDAR);
+        return ts != null ? new DateTime(ts.getTime()) : null;
+    }
+
+}