android.database.sqlite.SQLiteConstraintException：外键约束失败（代码19）

Question

我已经在Android应用程序创建我sqlLite DB验证码：

private static final String CREATE_TABELLA_PERSONE = "CREATE TABLE TB_PERSONE " 
+ "(_ID integer," 
+ "CODICE_PERSONA text not null, DESC_PERSONA text null, " 
+ "PRIMARY KEY (CODICE_PERSONA));"; 

和

private static final String CREATE_TABELLA_USCITE = "CREATE TABLE AN_USCITE " 
+ "(_ID integer, " 
+ "CODICE_USCITA text null, SCADENZA text null, DATA text null," 
+ "PERSONA text not null REFERENCES TB_PERSONE(CODICE_PERSONA) ON DELETE NO ACTION ON UPDATE  CASCADE,PRIMARY KEY(CODICE_USCITA));"; 

当我调用函数DELETE在“TB_PERSONE”中排一行

public int SQLdelete(String tabella, String id) { 
    return database.delete(tabella, "_ID=" + id, null); 
} 

该应用程序向我显示此错误：

04-27 11:15:27.152: E/AndroidRuntime(22031): FATAL EXCEPTION: main 
04-27 11:15:27.152: E/AndroidRuntime(22031): android.database.sqlite.SQLiteConstraintException:   
foreign key constraint failed (code 19) 
04-27 11:15:27.152: E/AndroidRuntime(22031): at android.database.sqlite.SQLiteConnection.nativeExecuteForChangedRowCount(Native Method) 
04-27 11:15:27.152: E/AndroidRuntime(22031): at android.database.sqlite.SQLiteConnection.executeForChangedRowCount(SQLiteConnection.java:727) 
04-27 11:15:27.152: E/AndroidRuntime(22031): at android.database.sqlite.SQLiteSession.executeForChangedRowCount(SQLiteSession.java:754) 
04-27 11:15:27.152: E/AndroidRuntime(22031): at android.database.sqlite.SQLiteStatement.executeUpdateDelete(SQLiteStatement.java:64) 
04-27 11:15:27.152: E/AndroidRuntime(22031): at android.database.sqlite.SQLiteDatabase.delete(SQLiteDatabase.java:1494) 
04-27 11:15:27.152: E/AndroidRuntime(22031): at it.jackpot21.personalmoney.DbAdapter.SQLdelete(DbAdapter.java:89) 
04-27 11:15:27.152: E/AndroidRuntime(22031): at it.jackpot21.personalmoney.PersoneActivity$5.onClick(PersoneActivity.java:215) 
04-27 11:15:27.152: E/AndroidRuntime(22031): at android.view.View.performClick(View.java:4084) 
04-27 11:15:27.152: E/AndroidRuntime(22031): at android.view.View$PerformClick.run(View.java:16966) 
04-27 11:15:27.152: E/AndroidRuntime(22031): at android.os.Handler.handleCallback(Handler.java:615) 
04-27 11:15:27.152: E/AndroidRuntime(22031): at android.os.Handler.dispatchMessage(Handler.java:92) 
04-27 11:15:27.152: E/AndroidRuntime(22031): at android.os.Looper.loop(Looper.java:137) 
04-27 11:15:27.152: E/AndroidRuntime(22031): at android.app.ActivityThread.main(ActivityThread.java:4745) 
04-27 11:15:27.152: E/AndroidRuntime(22031): at java.lang.reflect.Method.invokeNative(Native Method) 
04-27 11:15:27.152: E/AndroidRuntime(22031): at java.lang.reflect.Method.invoke(Method.java:511) 
04-27 11:15:27.152: E/AndroidRuntime(22031): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
04-27 11:15:27.152: E/AndroidRuntime(22031): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
04-27 11:15:27.152: E/AndroidRuntime(22031): at dalvik.system.NativeStart.main(Native Method) 

有人可以帮我吗？
非常感谢！ :)

编辑：
我解决了它通过把ON DELETE SET NULL。
谢谢！

Answer 1

这意味着AN_USCITE表中仍包含一些引用您要删除的人的记录。

Answer 2

看起来您正在从TB_PERSONE删除一条记录，该记录来自表AN_USCITE的记录。

所以，

1）删除该记录从AN_USCITE从TB_PERSONE删除记录之前。

或

2）设置ON DELETE CASCADE在你的外键的定义：

... 
PERSONA text not null REFERENCES TB_PERSONE(CODICE_PERSONA) ON DELETE CASCADE ... 
... 

Answer 3

请确保String id没有空，因此您在下面的代码可以执行。

public int SQLdelete(String tabella, String id) { 
    return database.delete(tabella, "_ID=" + id, null); 
}