Question

这是我定义的表格字段：

@DatabaseField(uniqueCombo = true, columnName = COLUMN_NAME_FEED_PROVIDER_TYPE, canBeNull = false)
private int mFeedProviderType;
@DatabaseField(uniqueCombo = true, columnName = COLUMN_NAME_FEED_PROVIDER_SUB_TYPE)
private String mSubType; 
@DatabaseField(columnName = COLUMN_NAME_DATE, canBeNull = false)
private long mDate;

我设法添加了1行。但是当我尝试添加第二行时这次更改mSubType字符串字段，它会抛出并且除外：

at com.j256.ormlite.misc.SqlExceptionUtil.create(SqlExceptionUtil.java:22)
at com.j256.ormlite.stmt.mapped.MappedCreate.insert(MappedCreate.java:135)
at com.j256.ormlite.stmt.StatementExecutor.create(StatementExecutor.java:450)
at com.j256.ormlite.dao.BaseDaoImpl.create(BaseDaoImpl.java:310)
at android.app.Activity.performCreate(Activity.java:5104)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
at com.j256.ormlite.misc.SqlExceptionUtil.create(SqlExceptionUtil.java:22)
at com.j256.ormlite.android.AndroidDatabaseConnection.insert(AndroidDatabaseConnection.java:169)
at com.j256.ormlite.stmt.mapped.MappedCreate.insert(MappedCreate.java:91)
at com.j256.ormlite.android.AndroidDatabaseConnection.insert(AndroidDatabaseConnection.java:155)

Answer 1

即使你使用uniqueCombo，你也需要一个id。所以添加一个这样的generatedId注释：

@DatabaseField(generatedId = true)
private int _id;//主键id

ORMLite无法在android中创建具有唯一组合的行

1 个答案: