public interface BaseMapper<T> extends Mapper<T> {

    /**
     * 插入一條記錄
     *
     * @param entity 實(shí)體對(duì)象
     */
    int insert(T entity);


    /**
     * 根據(jù) entity 條件，刪除記錄
     *
     * @param wrapper 實(shí)體對(duì)象封裝操作類（可以為 null）
     */
    int delete(@Param(Constants.WRAPPER) Wrapper<T> wrapper);

    /**
     * 根據(jù) whereEntity 條件，更新記錄
     *
     * @param entity        實(shí)體對(duì)象 (set 條件值,可以為 null)
     * @param updateWrapper 實(shí)體對(duì)象封裝操作類（可以為 null,里面的 entity 用于生成 where 語句）
     */
    int update(@Param(Constants.ENTITY) T entity, @Param(Constants.WRAPPER) Wrapper<T> updateWrapper);

    /**
     * 根據(jù) ID 查詢
     *
     * @param id 主鍵ID
     */
    T selectById(Serializable id);
}

/**
 * 實(shí)體類
 *
 * @author Chill
 */
@Data
@TableName("user")
@EqualsAndHashCode(callSuper = true)
public class User extends TenantEntity {

	private static final long serialVersionUID = 1L;

	/**
	 * 用戶編號(hào)
	 */
	private String code;
	/**
	 * 賬號(hào)
	 */
	private String account;
	/**
	 * 密碼
	 */
	private String password;
	/**
	 * 昵稱
	 */
	private String name;
}

/**
 * Mapper 接口
 *
 * @author Chill
 */
public interface UserMapper extends BaseMapper<User> {
}

@Override
	public User getById(String id){
		User user = userMapper.selectById(id);
		return null;
	}

@Override
    public void inspectInject(MapperBuilderAssistant builderAssistant, Class<?> mapperClass) {
        Class<?> modelClass = extractModelClass(mapperClass);
        if (modelClass != null) {
            String className = mapperClass.toString();
            Set<String> mapperRegistryCache = GlobalConfigUtils.getMapperRegistryCache(builderAssistant.getConfiguration());
            if (!mapperRegistryCache.contains(className)) {
            //獲取 CRUD 實(shí)現(xiàn)類列表
                List<AbstractMethod> methodList = this.getMethodList(mapperClass);
                if (CollectionUtils.isNotEmpty(methodList)) {
                    TableInfo tableInfo = TableInfoHelper.initTableInfo(builderAssistant, modelClass);
                    // 循環(huán)注入自定義方法，這里開始注入 sql
                    methodList.forEach(m -> m.inject(builderAssistant, mapperClass, modelClass, tableInfo));
                } else {
                    logger.debug(mapperClass.toString() + ", No effective injection method was found.");
                }
                mapperRegistryCache.add(className);
            }
        }
    }

/**
 * SQL 默認(rèn)注入器
 *
 * @author hubin
 * @since 2018-04-10
 */
public class DefaultSqlInjector extends AbstractSqlInjector {

    @Override
    public List<AbstractMethod> getMethodList(Class<?> mapperClass) {
        return Stream.of(
            new Insert(),
            new Delete(),
            new DeleteByMap(),
            new DeleteById(),
            new DeleteBatchByIds(),
            new Update(),
            new UpdateById(),
            new SelectById(),
            new SelectBatchByIds(),
            new SelectByMap(),
            new SelectOne(),
            new SelectCount(),
            new SelectMaps(),
            new SelectMapsPage(),
            new SelectObjs(),
            new SelectList(),
            new SelectPage()
        ).collect(toList());
    }
}

@Override
    public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
      /** 定義 mybatis xml method id, 對(duì)應(yīng) <id="xyz"> **/
        SqlMethod sqlMethod = SqlMethod.SELECT_BY_ID;
    /** 構(gòu)造 id 對(duì)應(yīng)的具體 xml 片段 **/
        SqlSource sqlSource = new RawSqlSource(configuration, String.format(sqlMethod.getSql(),
            sqlSelectColumns(tableInfo, false),
            tableInfo.getTableName(), tableInfo.getKeyColumn(), tableInfo.getKeyProperty(),
            tableInfo.getLogicDeleteSql(true, true)), Object.class);
         /** 將 xml method 方法添加到 mybatis 的 MappedStatement 中 **/
        return this.addSelectMappedStatementForTable(mapperClass, getMethod(sqlMethod), sqlSource, tableInfo);
    }

/**
     * <p>
     * 實(shí)體類反射獲取表信息【初始化】
     * </p>
     *
     * @param clazz 反射實(shí)體類
     * @return 數(shù)據(jù)庫表反射信息
     */
    public synchronized static TableInfo initTableInfo(MapperBuilderAssistant builderAssistant, Class<?> clazz) {
        TableInfo tableInfo = TABLE_INFO_CACHE.get(clazz);
        if (tableInfo != null) {
            if (builderAssistant != null) {
                tableInfo.setConfiguration(builderAssistant.getConfiguration());
            }
            return tableInfo;
        }

        /* 沒有獲取到緩存信息,則初始化 */
        tableInfo = new TableInfo(clazz);
        GlobalConfig globalConfig;
        if (null != builderAssistant) {
            tableInfo.setCurrentNamespace(builderAssistant.getCurrentNamespace());
            tableInfo.setConfiguration(builderAssistant.getConfiguration());
            globalConfig = GlobalConfigUtils.getGlobalConfig(builderAssistant.getConfiguration());
        } else {
            // 兼容測(cè)試場(chǎng)景
            globalConfig = GlobalConfigUtils.defaults();
        }

        /* 初始化表名相關(guān) */
        final String[] excludeProperty = initTableName(clazz, globalConfig, tableInfo);

        List<String> excludePropertyList = excludeProperty != null && excludeProperty.length > 0 ? Arrays.asList(excludeProperty) : Collections.emptyList();

        /* 初始化字段相關(guān) */
        initTableFields(clazz, globalConfig, tableInfo, excludePropertyList);

        /* 放入緩存 */
        TABLE_INFO_CACHE.put(clazz, tableInfo);

        /* 緩存 lambda */
        LambdaUtils.installCache(tableInfo);

        /* 自動(dòng)構(gòu)建 resultMap */
        tableInfo.initResultMapIfNeed();

        return tableInfo;
    }

  /**
     * <p>
     * 初始化 表主鍵,表字段
     * </p>
     *
     * @param clazz        實(shí)體類
     * @param globalConfig 全局配置
     * @param tableInfo    數(shù)據(jù)庫表反射信息
     */
    public static void initTableFields(Class<?> clazz, GlobalConfig globalConfig, TableInfo tableInfo, List<String> excludeProperty) {
        /* 數(shù)據(jù)庫全局配置 */
        GlobalConfig.DbConfig dbConfig = globalConfig.getDbConfig();
        ReflectorFactory reflectorFactory = tableInfo.getConfiguration().getReflectorFactory();
        //TODO @咩咩 有空一起來擼完這反射模塊.
        Reflector reflector = reflectorFactory.findForClass(clazz);
        List<Field> list = getAllFields(clazz);
        // 標(biāo)記是否讀取到主鍵
        boolean isReadPK = false;
        // 是否存在 @TableId 注解
        boolean existTableId = isExistTableId(list);
    
        List<TableFieldInfo> fieldList = new ArrayList<>(list.size());
        for (Field field : list) {
            if (excludeProperty.contains(field.getName())) {
                continue;
            }

            /* 主鍵ID 初始化 */
            if (existTableId) {
                TableId tableId = field.getAnnotation(TableId.class);
                if (tableId != null) {
                    if (isReadPK) {
                        throw ExceptionUtils.mpe("@TableId can't more than one in Class: \"%s\".", clazz.getName());
                    } else {
                        isReadPK = initTableIdWithAnnotation(dbConfig, tableInfo, field, tableId, reflector);
                        continue;
                    }
                }
            } else if (!isReadPK) {
                isReadPK = initTableIdWithoutAnnotation(dbConfig, tableInfo, field, reflector);
                if (isReadPK) {
                    continue;
                }
            }

            /* 有 @TableField 注解的字段初始化 */
            if (initTableFieldWithAnnotation(dbConfig, tableInfo, fieldList, field)) {
                continue;
            }

            /* 無 @TableField 注解的字段初始化 */
            fieldList.add(new TableFieldInfo(dbConfig, tableInfo, field));
        }

        /* 檢查邏輯刪除字段只能有最多一個(gè) */
        Assert.isTrue(fieldList.parallelStream().filter(TableFieldInfo::isLogicDelete).count() < 2L,
            String.format("@TableLogic can't more than one in Class: \"%s\".", clazz.getName()));

        /* 字段列表,不可變集合 */
        tableInfo.setFieldList(Collections.unmodifiableList(fieldList));

        /* 未發(fā)現(xiàn)主鍵注解，提示警告信息 */
        if (!isReadPK) {
            logger.warn(String.format("Can not find table primary key in Class: \"%s\".", clazz.getName()));
        }
    }