我们如何获取通过代码插入的行的 id

Question

I need to retrieve the id of the row inserted just now. ie, i have a table for words and a table for meaning. i need the wordId of the word i insert in the table for words and that wordId is used for inserting the meaning in meaning table. Can anyone help me out??

I thought i could use trigger and tried the trigger:

"CREATE TRIGGER IF NOT EXISTS word_insert_trigger AFTER INSERT ON tb_words BEGIN select NEW.word_id from tb_words; END;"

like this. i tried this in sqlite dbbrowser. but it didn't work out.

i need the row id when i insert a row like this :"insert into tb_words(word_name) values('test');"

How can i do that without using "SELECT last_insert_rowid()"? like in the following link: How to retrieve the last autoincremented ID from a SQLite table?

Answer 1

No need for a trigger. Use the SQliteDatabase insert method. It returns the id (as a long ) (more correctly it returns the rowid and assuming that the word_id column has been defined as an alias of the rowid column, then the returned value will be the value assigned to the word_id column).

An alias of the rowid column is defined if word_id INTEGER PRIMARY KEY is coded (the AUTOINCREMENT key may be used BUT in generally should not be used).

You may wish to read SQLite AUTOINCREMENT and/or Rowid Tables

Instead of something like :-

db.execsql("insert into tb_words(word_name) values('test');");

You would use something like :-

ContentValues cv = new ContentValues();
cv.put("word_name","test");
long word_id = db.insert("tb_words",null,cv);