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[英]Android app error on Room with @NonNull for Primay Key despite being annotated with @NonNull
[英]SQLite primay key setting error - why so?
我正在尝试使用 DB Handler 制作数据库和表,并在 MainActivty 中插入数据。
问题是 Data instertig function 仅在我没有设置主键时才有效。
这是日志猫。
android.database.sqlite.SQLiteConstraintException: UNIQUE constraint failed: keikoTable._id (code 1555 SQLITE_CONSTRAINT_PRIMARYKEY)
DBhandler.class
@Override
public void onCreate(SQLiteDatabase db) {
String sql = "CREATE TABLE " + TABLE_INFO + "(_id text PRIMARY KEY , year text, " +
" month text, date text, chek integer, log text)";
db.execSQL(sql);
}
MainActivity.java
public void dbInsert (String year, String month, String date, String log) {
int doublechk = 0;
String idCombine = year + month + date + doublechk;
Cursor cursor = readdb.rawQuery("SELECT _id FROM " + TABLE_INFO, null);
while (cursor.moveToNext()){
if (cursor.getString(0) == idCombine){
doublechk ++;
idCombine = year + month + date + doublechk;
} else {
break;
}
}
String sql = "INSERT INTO " + TABLE_INFO + " VALUES ('" + idCombine + "', '" + year + "', '"+ month + "', '"
+ date + "', '" + doublechk + "', '" + log + "')";
db.execSQL(sql);
}
来自官方指南SQLiteConstraintException
指示违反完整性约束的异常。
你应该更正声明
String sql = "CREATE TABLE " + TABLE_INFO + "( _id INTEGER PRIMARY KEY
和
if (cursor.getInt(0) == idCombine){
然后卸载并再次运行。
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