Android: 如何使用 SugarORM 搜索数据

Android: How to search data using SugarORM

我不熟悉 Sqlite,因此正在使用数据库库 SugarORM,其文档位于 http://satyan.github.io/sugar/creation.html

它的大部分功能与sqlite中的相同,但使用更简单的命令。

练习数据库

public class ExerciseDB extends SugarRecord 
{
    @Column(name = "ex_recordId", unique = true, notNull = true)
    private String ex_recordId;
    private String ex_group;
    private String ex_name;    
    private int ex_cal;

    public ExerciseDB()
    {
    }

    public ExerciseDB(String ex_recordId, String ex_group, String ex_name, int ex_cal) 
    {
        this.ex_recordId = ex_recordId;
        this.ex_group = ex_group;
        this.ex_name = ex_name;
        this.ex_cal = ex_cal;
    }

数据库保存如下举例:

ExerciseDB e0001= new ExerciseDB("ex0001", "Sports", "AAA", 190); save(e0001);
ExerciseDB e0002= new ExerciseDB("ex0002", "Sports", "BBB", 190); save(e0002);

问题:

请问如何搜索"ex0001"记录? 我尝试使用以下代码进行搜索:

ExerciseDB.find(ExerciseDB.class, key);
List<ExerciseDB> books = ExerciseDB.find(ExerciseDB.class, "ex_recordId = ?", key, null,null,null);
String gg = books.get(1).get_ex_group();

但它报告

android.database.sqlite.SQLiteException: no such column: ex0001 (code 1): , while compiling: SELECT * FROM Ex_Records WHERE ex0001

查找的官方文档:

List<Book> books = Book.find(Book.class, "author = ?", new String{author.getId()});

Book book = Book.findById(Books.class, 1);
Author author = book.author;

但不知道这个 1 代表什么以及如何找到

代码说明如下:

    public static <T> List<T> find(Class<T> type, String whereClause, String... whereArgs) {
        return find(type, whereClause, whereArgs, null, null, null);
    }

public static <T> List<T> find(Class<T> type, String whereClause, String[] whereArgs, String groupBy, String orderBy, String limit) {
        SugarDb db = getSugarContext().getSugarDb();
        SQLiteDatabase sqLiteDatabase = db.getDB();
        T entity;
        List<T> toRet = new ArrayList<T>();
        Cursor c = sqLiteDatabase.query(NamingHelper.toSQLName(type), null, whereClause, whereArgs,
                groupBy, null, orderBy, limit);
        try {
            while (c.moveToNext()) {
                entity = type.getDeclaredConstructor().newInstance();
                SugarRecord.inflate(c, entity);
                toRet.add(entity);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            c.close();
        }
        return toRet;
    }

基础应该和Sqlite差不多。。。有没有人可以根据上面的代码文档提供帮助?非常感谢!

我用它的另一种方法findWithQuery如下:

List<ExerciseDB> bb = ExerciseDB.findWithQuery(ExerciseDB.class, "Select * from Ex_Records where ex_recordId = ?", "ex0001");

我想你现在可能已经找到了答案,但对于遇到这个问题并想知道的人来说。

Sugar 格式化列名:"read" 变为 "READ",isRead 变为 "IS_READ"。所以你可以使用你的SugarRecord.find()。您只需要弄清楚 sugar 如何格式化您的列名 "ex_recordId"。我认为它会将其格式化为 EX_RECORD_ID 或 EXRECORD_ID.