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私はSQLiteデータベースに挿入します。挿入は成功しますが、テーブルには面白い動作が表示されます。挿入は常に最初のインデックスで行われ、前のレコードが削除されます（テーブルを再作成してレコードを挿入する動作が表示されます）。私は通常の挿入、すなわち後続のレコードを私のテーブルに挿入する必要があります。SQliteの挿入は常に同じインデックスで行われます
Here is the relevant code
public class FarmsDbHelper extends SQLiteOpenHelper {
String JSON_STRING;
private SimpleDateFormat dateFormatter = new SimpleDateFormat("yyyy-MM-dd", Locale.US);
private final static String LOG_TAG = FarmsDbHelper.class.getSimpleName();
// Database name
private final static String DB_NAME = FarmsContract.DATABASE_NAME;
// Database version
private final static int DB_VERSION = 8;
// Farmers table
private final static String FARM_TABLE_NAME = FarmsContract.Farms.TABLE_NAME;
private final static String FARM_ROW_ID = FarmsContract.Farms.ID;
private final static String FARM_ROW_FARM_NAME = FarmsContract.Farms.FARM_NAME;
private final static String FARM_ROW_SIZE_WITH_TOBACCO = FarmsContract.Farms.SIZE_WITH_TOBACCO;
private final static String FARM_ROW_PLANTING_DATE = FarmsContract.Farms.PLANTING_DATE;
private final static String FARM_ROW_FARMER_ID = FarmsContract.Farms.FARMER_ID;
private final static String FARM_ROW_SEASON_ID = FarmsContract.Farms.SEASON_ID;
private final static String FARM_ROW_IS_SYNCED = FarmsContract.Farms.IS_SYNCED;
private final static String FARM_ROW_UPDATED_AT = FarmsContract.Farms.UPDATED_AT;
private final static String FARM_ROW_DELETED = FarmsContract.Farms.DELETED;
private final static String FARM_ROW_CREATION_DATE = FarmsContract.Farms.CREATION_DATE;
// SQL statement to create the Version table
private final static String FARM_TABLE_CREATE =
"CREATE TABLE " +
FARM_TABLE_NAME + " (" +
FARM_ROW_ID + " INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, " +
FARM_ROW_FARM_NAME + " TEXT NULL, " +
FARM_ROW_SIZE_WITH_TOBACCO + " TEXT NULL, " +
FARM_ROW_PLANTING_DATE + " TEXT NULL, " +
FARM_ROW_FARMER_ID + " TEXT NULL, " +
FARM_ROW_SEASON_ID + " TEXT NULL, " +
FARM_ROW_IS_SYNCED + " TEXT NULL, " +
FARM_ROW_UPDATED_AT + " TEXT NULL, " +
FARM_ROW_DELETED + " TEXT NULL, " +
FARM_ROW_CREATION_DATE + " TEXT NULL" + ");";
public FarmsDbHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
// Create Version table
db.execSQL(FARM_TABLE_CREATE);
Log.i(LOG_TAG, "Creating table with query: " + FARM_TABLE_CREATE);
//create an async task here for reading from the remote server on database Farms Contract creation
new RetrieveFarmsTask().execute();
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + FARM_TABLE_NAME);
onCreate(db);
}
@Override
public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public void insertFarms(FarmsBean farmsBean) {
Log.i(LOG_TAG, "Added a farm - " + farmsBean.toString());
// Get reference to writable DB
SQLiteDatabase db = this.getWritableDatabase();
// Create ContentValues to add data
ContentValues contentValues = new ContentValues();
contentValues.put(FARM_ROW_ID, farmsBean.getId());
contentValues.put(FARM_ROW_FARM_NAME, farmsBean.getFarmName());
contentValues.put(FARM_ROW_SIZE_WITH_TOBACCO, farmsBean.getSizeWithTobacco());
contentValues.put(FARM_ROW_PLANTING_DATE, farmsBean.getPlantingDate().toString());
contentValues.put(FARM_ROW_FARMER_ID, farmsBean.getFarmerId());
contentValues.put(FARM_ROW_SEASON_ID, farmsBean.getSeasonId());
try{
contentValues.put(FARM_ROW_IS_SYNCED, farmsBean.isSynced());
contentValues.put(FARM_ROW_UPDATED_AT, farmsBean.getUpdatedAt().toString());
}
catch (Exception ex){
ex.getMessage();
}
contentValues.put(FARM_ROW_DELETED, farmsBean.isDeleted());
contentValues.put(FARM_ROW_CREATION_DATE, farmsBean.getCreationDate().toString());
// Insert data to table
long farmResult = db.insert(FARM_TABLE_NAME, null, contentValues);
// Remember to close the db
db.close();
}
}
Here is my contract class
package netcen.client.co.ke.SQLiteDatabase;
import android.provider.BaseColumns;
/**
* Created by CIO on 9/27/2016.
*/
public class FarmsContract implements BaseColumns {
public static final String DATABASE_NAME = "uap.db";
/**
* Define the Farms table
*/
public static final class Farms {
// Define table name
public static final String TABLE_NAME = "farms";
// Define table columns
public static final String ID = BaseColumns._ID;
public static final String FARM_NAME = "farm_name";
public static final String SIZE_WITH_TOBACCO = "size_with_tobacco";
public static final String PLANTING_DATE = "planting_date";
public static final String FARMER_ID = "farmer_id";
public static final String SEASON_ID = "season_id";
public static final String IS_SYNCED = "is_synced";
public static final String UPDATED_AT = "updated_at";
public static final String DELETED = "deleted";
public static final String CREATION_DATE = "creation_date";
// Define projection for customer table
public static final String[] PROJECTION = new String[]{
/*0*/ FarmsContract.Farms.ID,
/*1*/ FarmsContract.Farms.FARM_NAME,
/*2*/ FarmsContract.Farms.SIZE_WITH_TOBACCO,
/*3*/ FarmsContract.Farms.PLANTING_DATE,
/*4*/ FarmsContract.Farms.FARMER_ID,
/*5*/ FarmsContract.Farms.SEASON_ID,
/*6*/ FarmsContract.Farms.IS_SYNCED,
/*7*/ FarmsContract.Farms.UPDATED_AT,
/*8*/ FarmsContract.Farms.DELETED,
/*9*/ FarmsContract.Farms.CREATION_DATE
};
}
}
Here's where I call the insertion method
FarmsBean farmsBean = new FarmsBean();
farm_id = new IdGenerator().generatePin();
farmsBean.setId(farm_id);
farmsBean.setFarmName(captured_farmName);
farmsBean.setSizeWithTobacco(parseInt(captured_farmSize));
try {
farmsBean.setPlantingDate(dateFormatter.parse(captured_date));
} catch (ParseException e) {
e.printStackTrace();
}
farmsBean.setFarmerId(parseInt(cur_farmer_id));
farmsBean.setSeasonId(parseInt(cur_season_id));
farmsBean.setDeleted(false);
farmsBean.setCreationDate(new Date());
if(farmsBean!=null){
farmsDbHelper.insertFarms(farmsBean);
}
私はこれについて正確にはわかりませんが、代わりに 'CREATE TABLE IF NOT EXISTS'を使うべきではありませんか？これがこの動作を引き起こしているかどうかはわかりません。多分あなたはテーブルを再作成します。 – Opiatefuchs