SQLite：唯一插入问题

Question

在指定复合主键的表中插入行时遇到问题。

复合键打开：

_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

每当我尝试插入具有相同“_id”列值的第二行时，我都会收到以下错误：

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

表格是这样指定的：

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

您的UNIQUE 约束是错误的。列名变量有来自其他表的_id，而不是series 表中的列，并且约束变为(_id,_id,_id)，而不是(_id,shooting_id,program_id)。