Question

public static final String TABLE_TASKS = "tasks";
public static final String COLUMN_ID = "_id";
public static final String COLUMN_TASK = "task";
public static final String COLUMN_TIME = "time";
public static final String COLUMN_INITDATE = "initdate";
public static final String COLUMN_PRIORITY="priority";

public static final String TABLE_REPEAT = "alarms";
public static final String COLUMN_AID = "_aid";
public static final String COLUMN_TID = "tid";

public static final String COLUMN_DAYS =“days”;

private static final String DATABASE1_CREATE = "create table " + TABLE_TASKS + "("
+ COLUMN_ID + " integer primary key autoincrement, "+ COLUMN_TASK
+ " text not null, "+ COLUMN_TIME+" integer not null, "+ COLUMN_INITDATE+" integer not null, "+ COLUMN_PRIORITY +" integer );";

private static final String DATABASE2_CREATE = "create table " + TABLE_REPEAT + "("
        + COLUMN_AID + " integer primary key autoincrement, "+  " FOREIGN KEY (" + COLUMN_TID + ") REFERENCES " + TABLE_TASKS + " ( " + COLUMN_ID + " ), "+ COLUMN_DAYS + " text not null );";

我的logcat如下： 03-06 09：17：07.051：E / AndroidRuntime（1029）：java.lang.RuntimeException：无法启动活动ComponentInfo {com.example.habitator / com.example.habitator.Habitator}：android.database.sqlite.SQLiteException ：外键定义中的未知列“tid”（代码1）:,同时编译：创建表警报（_aid整数主键自动增量，FOREIGN KEY（tid）REFERENCES任务（_id），天文本不为空）;

请帮我找错！为什么我的prgram崩溃？

Answer 1

尝试此查询。

create table alarms(_aid integer primary key autoincrement, tid integer FOREIGNKEY REFERENCES tasks ( _id ), days text not null );

https://www.sqlite.org/foreignkeys.html

android外键。程序崩溃

1 个答案: