Question

摘要

SQLiteDatabase.insertOrThrow（）执行，不抛出异常，并返回正整数;但是，记录不会写入数据库。

详情

我正在实现存储库模式，并拥有一个通用的基础存储库。

public class BaseRepository<T> implements Repository<T> {

    private enum Operation {
        Add, Update, Delete
    }

    private final SQLiteOpenHelper openHelper;
    private final String tableName;
    private final Mapper<T, ContentValues> toContentValues;
    private final Mapper<Cursor, T> toTypeMapper;

    public BaseRepository(Context context, String tableName, Mapper<T, ContentValues> toContentValues,
                      Mapper<Cursor, T> toTypeMapper) {
        this.openHelper = new DbOpenHelper(context);
        this.tableName = tableName;
        this.toContentValues = toContentValues;
        this.toTypeMapper = toTypeMapper;
    }

    @Override
    public void add(T item) {
        transaction(Operation.Add, item, null);
    }

    @Override
    public void update(T item, String filter) {
        transaction(Operation.Update, item, filter);
    }

    @Override
    public void delete(String filter) {
        transaction(Operation.Delete, null, filter);
    }

    private void transaction(Operation operation, T item, String filter) {
        final SQLiteDatabase database = openHelper.getWritableDatabase();
        database.beginTransaction();

        try {
            switch (operation) {
                case Add:
                    try { // For debugging, to catch any possible exception
                        ContentValues values = toContentValues.map(item);
                        long result = database.insertOrThrow(tableName, null, values);
                        String temp = ""; // For debugging
                    } catch (Exception e) {
                        String message = e.getMessage(); // For debugging
                    }
                    break;
                case Update:
                    database.update(tableName, toContentValues.map(item), filter, null);
                    break;
                case Delete:
                    database.delete(tableName, filter, null);
                    break;
            }
        } finally {
            database.endTransaction();
            database.close();
        }
    }
}

它进入transaction()方法，并运行database.insert()方法。我设置了断点并检查了表名和值。表名正确且值正确。该方法运行并返回一个正整数，表示插入成功。但是，当我检查数据库时，未插入记录。

我有获取数据的方法，但它们正常运行。如果我手动添加行，get方法可以成功运行。

关于这里发生了什么的任何想法？我已经被困在这几个小时了。

谢谢！

Answer 1

想出来。我忘记了database.setTransactionSuccessful()：

private void transaction(Operation operation, T item, String filter) {
    final SQLiteDatabase database = openHelper.getWritableDatabase();
    database.beginTransaction();

    try {
        switch (operation) {
            case Add:
                try { // For debugging, to catch any possible exception
                    ContentValues values = toContentValues.map(item);
                    long result = database.insertOrThrow(tableName, null, values);
                    String temp = ""; // For debugging
                } catch (Exception e) {
                    String message = e.getMessage(); // For debugging
                }
                break;
            case Update:
                database.update(tableName, toContentValues.map(item), filter, null);
                break;
            case Delete:
                database.delete(tableName, filter, null);
                break;
        }
        database.setTransactionSuccessful(); // Added this.
    } finally {
        database.endTransaction();
        database.close();
    }
}

Android：SQLiteDatabase.insert未插入

1 个答案: