Get last inserted value from sqlite database Andro

问题:

I am trying to get the last inserted rowid from a sqlite database in Android. I have read a lot of posts about it, but can't get one to work. This is my method:

 public Cursor getLastId() {
        return mDb.query(DATABASE_TABLE, new String[] {KEY_WID}, KEY_WID + "=" + MAX(_id), null, null, null, null, null);}

I have tried with MAX, but I must be using it wrong. Is there another way?

回答1:

Well actually the SQLiteDatabase class has its own insert method which returns the id of the newly created row. I think this is the best way to get the new ID. You can check its documentation here.

I hope this helps.

回答2:

Use

 SELECT last_insert_rowid();

to get the last inserted rowid. If you are using AUTOINCREMENT keyword then

SELECT * from SQLITE_SEQUENCE;

will tell you the values for every table.

回答3:

To get the last row from the table..

Cursor cursor = theDatabase.query(DATABASE_TABLE, columns,null, null, null, null, null);
cursor.moveToLast();

回答4:

If you want the last_insert_id just afert a insert you can use that :

public long insert(String table, String[] fields, String[] vals ) 
{
    String nullColumnHack = null;
    ContentValues values = new ContentValues();
    for (int i = 0; i < fields.length; i++) 
    {
        values.put(fields[i], vals[i]); 
    }

    return myDataBase.insert(table, nullColumnHack, values);
}

回答5:

Try this:

public Cursor getLastId() {
        return mDb.query(DATABASE_TABLE, new String[] { **MAX(id)** }, null, null, null, null, null, null);}

回答6:

/**
 * @return
 */
public long getLastInsertId() {
    long index = 0;
    SQLiteDatabase sdb = getReadableDatabase();
    Cursor cursor = sdb.query(
            "sqlite_sequence",
            new String[]{"seq"},
            "name = ?",
            new String[]{TABLENAME},
            null,
            null,
            null,
            null
    );
    if (cursor.moveToFirst()) {
        index = cursor.getLong(cursor.getColumnIndex("seq"));
    }
    cursor.close();
    return index;
}

回答7:

Use moveToLast() in Cursor interface.

From android.googlesource.com

/**
 * Move the cursor to the last row.
 *
 * <p>This method will return false if the cursor is empty.
 *
 * @return whether the move succeeded.
 */
boolean moveToLast();

Simple example:

final static String TABLE_NAME = "table_name";
String name;
int id;
//....

Cursor cursor = db.rawQuery("SELECT  * FROM " + TABLE_NAME, null);

if(cursor.moveToLast()){
    //name = cursor.getString(column_index);//to get other values
    id = cursor.getInt(0);//to get id, 0 is the column index
}

Or you can get the last row when insertion(Which is @GorgiRankovski have mentioned):

long row = 0;//to get last row
//.....
SQLiteDatabase db= this.getWritableDatabase();

ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_NAME, name);

row = db.insert(TABLE_NAME, null, contentValues);
//insert() returns the row ID of the newly inserted row, or -1 if an error occurred 

Also their is a multiple ways you can do this using query:

1. One is expressed by @DiegoTorresMilano
2. SELECT MAX(id) FROM table_name. or to get all columns values SELECT * FROM table_name WHERE id = (SELECT MAX(id) FROM table_name).
3. If your PRiMARY KEY have sat to AUTOINCREMENT, you can SELECT vaules occording to max to min and limit the rows to 1 using SELECT id FROM table ORDER BY column DESC LIMIT 1 (If you want each and every value, use * instead of id)

回答8:

The insert method returns the id of row just inserted or -1 if there was an error during insertion.

long id = db.insert("your insertion statement");

db is an instance of your SQLiteDatabase.