android - 房间错误 : no viable alternative at input?

Question

我正在尝试使用房间库的@Query 注释更新表，下面是我的代码(在 Dao 接口(interface)中):

@Query("UPDATE table_name SET table_name.col1 = :val1 WHERE table_name.col2 = :val2")
void updateValue(long val1, long val2);

完整的错误字符串如下:

Error:(11, 10) error: no viable alternative at input 'UPDATE table_name SET table_name.'

这是实体类:

@Entity(tableName = "table_name")
public class SampleTable {

    @PrimaryKey
    @ColumnInfo(name = "_id")
    private Long Id;

    @ColumnInfo(name = "col1")
    private Long column1;

    @ColumnInfo(name = "col2")
    private Long column2;

    public Long getId() {
        return Id;
    }

    public void setId(Long id) {
        Id = id;
    }

    public Long getColumn1() {
        return column1;
    }

    public void setColumn1(Long column1) {
        this.column1 = column1;
    }

    public Long getColumn2() {
        return column2;
    }

    public void setColumn2(Long column2) {
        this.column2 = column2;
    }
}

我的代码有什么问题？

Answer 1

在这种情况下也可能发生此错误:

如果你传递的是一个列表，不要忘记添加括号将你的列表变量括起来，否则你会得到同样的错误:

@Query("select name from mytable where name in (:myList)")
LiveData<List<String>> findNames(List<String> myList);