DataSqlSource数据源

DataSqlSource是DataSource的SQL扩展类，增强了对原生SQL的操作。

SQL模板

Redkale中的SQL模板与Mybatis里的SQL模板用法类似，最大区别在于不需要写很多if/else判断语句,也不用写xml文件，框架会根据参数存在与否动态生成sql语句，查询结果时下划线式sql字段名和驼峰式类字段名会自动匹配。

    SELECT * FROM user WHERE user_id IN ${bean.userIds} OR user_name = ${bean.userName}

当bean.userIds=null，bean.userName='hello'时，sql语句转换成:

    SELECT * FROM user WHERE user_name = 'hello'

当bean.userIds=[1,2,3]，bean.userName=null时，sql语句转换成:

    SELECT * FROM user WHERE user_id IN (1,2,3)

IN或者NOT IN语句当参数不为null而是空数组或者空List会进行特殊处理，IN语句会转化成1=1, NOT IN语句会转化成1=2。当bean.userIds=空数组，bean.userName='hello'时，sql语句转换成:

    SELECT * FROM user WHERE 1=2 OR user_name = 'hello'

有些场景要求参数是必需的，就需要使用$${}来校验参数是否必需。

    DELETE FROM user WHERE user_name = $${bean.userName}

当bean=null或者bean.userName=null时，执行sql会报错 Missing parameter bean.userName

Service调用原生SQL模板示例：

public class ForumInfoService extends AbstractService {

    //查询单个记录的sql
    private static final String findSql = "SELECT f.forum_groupid, s.forum_section_color "
            + "FROM forum_info f, forum_section s "
            + " WHERE f.forumid = s.forumid AND "
            + "s.forum_sectionid = ${bean.forumSectionid} AND "
            + "f.forumid = ${bean.forumid} AND s.forum_section_color = ${bean.forumSectionColor}";

    //查询列表记录的sql
    private static final String querySql = "SELECT f.forum_groupid, s.forum_section_color "
            + "FROM forum_info f, forum_section s "
            + " WHERE f.forumid = s.forumid AND "
            + "s.forum_sectionid = ${bean.forumSectionid} AND "
            + "f.forumid = ${bean.forumid} AND s.forum_section_color = ${bean.forumSectionColor}";

    @Resource
    private DataSqlSource source;

    public ForumResult findForumResultOne(ForumBean bean) {
        return source.nativeQueryOne(ForumResult.class, findSql, Map.of("bean", bean));
    }

    public CompletableFuture<List<ForumResult>> queryForumResultListAsync(ForumBean bean) {
        return source.nativeQueryListAsync(ForumResult.class, querySql, Map.of("bean", bean));
    }
    
    //翻页查询
    public Sheet<ForumResult> queryForumResult(RowBound bound, ForumBean bean){
        return source.nativeQuerySheet(ForumResult.class, querySql, round, Map.of("bean", bean));
    }
}

DataSqlMapper

DataSqlMapper与MyBatis里的Mapper用法类似，且都支持异步方法。

public interface ForumInfoMapper extends BaseMapper<ForumInfo> {

    @Sql("SELECT f.forum_groupid, s.forum_section_color "
            + "FROM forum_info f, forum_section s "
            + "WHERE f.forumid = s.forumid "
            + "AND s.forum_sectionid = ${bean.forumSectionid} "
            + "AND f.forumid = ${bean.forumid} "
            + "AND s.forum_section_color = ${bean.forumSectionColor}")
    public ForumResult findForumResultOne(ForumBean bean);

    @Sql("SELECT f.forum_groupid, s.forum_section_color "
            + "FROM forum_info f, forum_section s "
            + "WHERE f.forumid = s.forumid AND "
            + "s.forum_sectionid = ${bean.forumSectionid} "
            + "AND f.forumid = ${bean.forumid} "
            + "AND s.forum_section_color = ${bean.forumSectionColor}")
    public CompletableFuture<ForumResult> findForumResultOneAsync(ForumBean bean);

    //翻页查询
    @Sql("SELECT f.forum_groupid, s.forum_section_color "
            + "FROM forum_info f, forum_section s "
            + " WHERE f.forumid = s.forumid AND "
            + "s.forum_sectionid = #{bean.forumSectionid} AND "
            + "f.forumid = #{bean.forumid} AND s.forum_section_color = #{bean.forumSectionColor}")
    public Sheet<ForumResult> queryForumResult(RowBound bound, ForumBean bean);

    @Sql("UPDATE forum_section s "
            + " SET s.forum_sectionid = '' "
            + " WHERE s.forum_section_color = $${bean.forumSectionColor}")
    public int updateForumResult(@Param("bean") ForumBean bean0);
}

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DataSqlSource数据源

SQL模板

DataSqlMapper

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