mybatis省略@Param注解操作

MapperMethod的execute方法中获取参数的方法convertArgsToSqlCommandParam
public Object execute(SqlSession sqlSession, Object[] args) {
  Object result;
  Object param;
  switch(this.command.getType()) {
  case INSERT:
    param = this.method.convertArgsToSqlCommandParam(args);
    result = this.rowCountResult(sqlSession.insert(this.command.getName(), param));
    break;
  case UPDATE:
    param = this.method.convertArgsToSqlCommandParam(args);
    result = this.rowCountResult(sqlSession.update(this.command.getName(), param));
    break;
  case DELETE:
    param = this.method.convertArgsToSqlCommandParam(args);
    result = this.rowCountResult(sqlSession.delete(this.command.getName(), param));
    break;
  case SELECT:
    if (this.method.returnsVoid() && this.method.hasResultHandler()) {
      this.executeWithResultHandler(sqlSession, args);
      result = null;
    } else if (this.method.returnsMany()) {
      result = this.executeForMany(sqlSession, args);
    } else if (this.method.returnsMap()) {
      result = this.executeForMap(sqlSession, args);
    } else if (this.method.returnsCursor()) {
      result = this.executeForCursor(sqlSession, args);
    } else {
      param = this.method.convertArgsToSqlCommandParam(args);
      result = sqlSession.selectOne(this.command.getName(), param);
      if (this.method.returnsOptional() && (result == null || !this.method.getReturnType().equals(result.getClass()))) {
        result = Optional.ofNullable(result);
      }
    }
    break;
  case FLUSH:
    result = sqlSession.flushStatements();
    break;
  default:
    throw new BindingException("Unknown execution method for: " + this.command.getName());
  }

  if (result == null && this.method.getReturnType().isPrimitive() && !this.method.returnsVoid()) {
    throw new BindingException("Mapper method '" + this.command.getName() + " attempted to return null from a method with a primitive return type (" + this.method.getReturnType() + ").");
  } else {
    return result;
  }
}

public Object convertArgsToSqlCommandParam(Object[] args) {
  return this.paramNameResolver.getNamedParams(args);
}

public ParamNameResolver(Configuration config, Method method) {
  Class<?>[] paramTypes = method.getParameterTypes();
  Annotation[][] paramAnnotations = method.getParameterAnnotations();
  SortedMap<Integer, String> map = new TreeMap();
  int paramCount = paramAnnotations.length;

  for(int paramIndex = 0; paramIndex < paramCount; ++paramIndex) {
    if (!isSpecialParameter(paramTypes[paramIndex])) {
      String name = null;
      Annotation[] var9 = paramAnnotations[paramIndex];
      int var10 = var9.length;

      for(int var11 = 0; var11 < var10; ++var11) {
        Annotation annotation = var9[var11];
        if (annotation instanceof Param) {
          this.hasParamAnnotation = true;
          name = ((Param)annotation).value();
          break;
        }
      }

      if (name == null) {
        if (config.isUseActualParamName()) {
          name = this.getActualParamName(method, paramIndex);
        }

        if (name == null) {
          name = String.valueOf(map.size());
        }
      }

      map.put(paramIndex, name);
    }
  }

  this.names = Collections.unmodifiableSortedMap(map);
}

public interface SystemParameterMapper {
  int deleteByPrimaryKey(Integer id);

  int insert(SystemParameterDO record);

  SystemParameterDO selectByPrimaryKey(Integer id);//不使用注解

  List<SystemParameterDO> selectAll();

  int updateByPrimaryKey(SystemParameterDO record);

  SystemParameterDO getByParamID(@Param("paramID") String paramID);//使用注解
}

<select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">
  select id, paramID, paramContent, paramType, memo
  from wh_system_parameter
  where id = #{id,jdbcType=INTEGER}
 </select>

<select id="getByParamID" resultMap="BaseResultMap">
  select id, paramID, paramContent, paramType, memo
  from wh_system_parameter
  where paramID = #{paramID}
 </select>