SQLite：唯一插入问题

Question

我有一个问题，在指定了复合主键的情况下将行插入表中。

复合键上：

_id = id of the series (this starts always with 0 for every new shooting) 
shooting_id = id of my training session 
program_id = id of discipline I am currently training 

每当我试着插入具有相同的 “_id” 列值的第二排，我得到这个错误：

INSERT INTO series(_id,shooting_id,rings,program_id) VALUES (?,?,?,?)]:  UNIQUE constraint failed: series._id, series._id, series._id 05-19 08:36:05.070 2417-2417/? E/SQLiteDatabase﹕ Error inserting _id=0 shooting_id=1 rings=100 program_id=0 android.database.sqlite.SQLiteConstraintException: UNIQUE constraint failed: series._id, series.program_id, series._id (code 2067) 

例子：

// first training session 
INSERT INTO series(_id,shooting_id,rings,program_id) VALUES (0,0,100,0) 
INSERT INTO series(_id,shooting_id,rings,program_id) VALUES (1,0,98,0) 
INSERT INTO series(_id,shooting_id,rings,program_id) VALUES (2,0,98,0) 
// second training session --> only shooting_id has changed (!!) 
INSERT INTO series(_id,shooting_id,rings,program_id) VALUES (0,1,100,0) <-- results in above error 

该表格如下所示：

private static final String CREATE_TABLE_SERIES = "CREATE TABLE IF NOT EXISTS " 
+ TABLE_SERIES + " (" 
+ COLUMN_SERIES_SHOOTING_ID + " integer NOT NULL, " 
+ COLUMN_SERIES_PROGRAM_ID + " integer NOT NULL, " 
+ COLUMN_SERIES_ID + " integer NOT NULL, " 
+ COLUMN_SERIES_RINGS + " integer NOT NULL, " 
+ "FOREIGN KEY(" + COLUMN_SERIES_SHOOTING_ID + ") REFERENCES " + TABLE_SHOOTING + "(_id), " 
+ "UNIQUE (" + COLUMN_SHOOTING_ID + "," + COLUMN_SERIES_PROGRAM_ID + "," + COLUMN_SERIES_ID + "));";` 

为什么？ :-(

Answer 1

你UNIQUE约束是错误的列名变量具有_id从其它表，而不是在series表中的列和约束变成(_id,_id,_id)，不(_id,shooting_id,program_id)