![]() Comments are added inside the code to understand the code in more detail. Navigate to the app > java > your app’s package name > Right-click on it > New > Java class and name it as DBHandler and add the below code to it. We are working on an app and use a local database that is created in the JAVA code, we are using Android Studio 2.1.1.1. I simply can't see how to get at this for a newly created record. Step 4: Creating a new Java class for performing SQLite operations. What I had hoped for was the newly created Record ID. I note that the revExecuteSQL command simply returns the number of affected rows/records, a 0 or an ERR. Is there a way for me to get the DB_ID, that SQLite just created/inserted, rather than having to send my user back to a full list of DB records and expect them to fin and then select the record they've just entered ? I can now UPDATE a record BUT cannot for the life of me see how to get my new DB_ID value back out so of my newly created / INSERTed record. Integer PRIMARY KEY AUTOINCREMENT NOT NULL UNIQUEĬREATE TABLE DBProperties (PID integer PRIMARY KEY AUTOINCREMENT NOT NULL UNIQUE. When I created the table in my DB ( CREATE TABLE.), I set the first field/column of that Table to be : Then it will insert all of the data from the _employees_old table into the employees table.I've gotten to the stage where I am now want to INSERT a record into my SQLite database Then it will create the new employees table with the hire_date field called start_date. This example will rename our existing employees table to _employees_old. When I push the data to the individual CardViews in my RecyclerView I am only getting the default value of zero. So 5 row inserts would produce 1,2,3,4,5 for rowids 1 to 5. And then increment CARDNUM by +1 each time a new row is inserted into the database. INSERT INTO employees (employee_id, last_name, first_name, start_date) I want to set the default value of CARDNUM to zero. Let's look at an example that shows how to rename a column in a SQLite table.Īnd we wanted to rename the hire_date field to start_date, we could do the following: PRAGMA foreign_keys=off The syntax to RENAME A COLUMN in a table in SQLite is: PRAGMA foreign_keys=off Instead you will need to rename the table, create a new table, and copy the data into the new table. You can not use the ALTER TABLE statement to rename a column in SQLite. Then it will insert all of the data (excluding the hire_date field) from the _employees_old table into the employees table. Then it will create the new employees table with the hire_date field removed. This example will rename our existing employees table to _employees_old. In this blog, we have explored the usage of SQLite Database in Android for performing CRUD operations efficiently. SELECT employee_id, last_name, first_name INSERT INTO employees (employee_id, last_name, first_name) Let's look at an example that shows how to drop a column in a SQLite table.įor example, if we had an employees table that was defined as follows: CREATE TABLE employeesĪnd we wanted to drop the column called hire_date, we could do the following: PRAGMA foreign_keys=off SQLite AUTOINCREMENT is a keyword used for auto incrementing a value of a field in the table.You do not need ID1. The syntax to DROP A COLUMN in a table in SQLite is: PRAGMA foreign_keys=off You can not use the ALTER TABLE statement to drop a column in a table. Then it will insert all of the data from the _employees_old table into the employees table. Then it will create the new employees table with the last_name field defined as a VARCHAR datatype. SELECT employee_id, last_name, first_name, hire_date INSERT INTO employees (employee_id, last_name, first_name, hire_date) ( employee_id INTEGER PRIMARY KEY AUTOINCREMENT,Īnd we wanted to change the datatype of the last_name field to VARCHAR, we could do the following: PRAGMA foreign_keys=off ĪLTER TABLE employees RENAME TO _employees_old Let's look at an example that shows how to modify a column in a SQLite table.įor example, if we had an employees table that had a column called last_name that was defined as a CHAR datatype: CREATE TABLE employees The syntax to MODIFY A COLUMN in a table in SQLite is: PRAGMA foreign_keys=off ĪLTER TABLE table1 RENAME TO _table1_old ![]() ![]() You can not use the ALTER TABLE statement to modify a column in SQLite.
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