SQLite creates a table and adds data. sqlite creates data.

SQLite creates a table and adds data. sqlite creates data.

-(Void) viewDidLoad {[super viewDidLoad]; // create a table [self creatTable]; // insert data [self insertTable];} // --------------------- create a table ------------------- (void) creatTable {// 1. create a database object sqlite3 * sqlite3 = nil; // 2. path of the database NSString * path = [NSHomeDirectory () stringByAppendingPathComponent: @ "Documents/mySqlite. db "]; // 3. open the database (open the database file through the specified path, if not, create it) int result = sqlite3_open ([path UTF8String], & sqlite3 ); If (result! = SQLITE_ OK) {NSLog (@ "failed to open the database! "); Return;} // 4. CREATE an SQL statement NSString * SQL = @ "CREATE TABLE Students (id integer PRIMARY KEY, name text)"; // 5. run the SQL statement char * error = NULL; result = sqlite3_exec (sqlite3, [SQL UTF8String], NULL, NULL, & error); if (result! = SQLITE_ OK) {NSLog (@ "An error occurred while executing the SQL statement! "); // 6. close the database sqlite3_close (sqlite3); return;} // 6. close the database sqlite3_close (sqlite3);} // --------------------------- insert data ------------------------- (void) insertTable {// 1. create a database object sqlite3 * sqlite3 = nil; // 2. path of the database NSString * path = [NSHomeDirectory () stringByAppendingPathComponent: @ "Documents/mySqlite. db "]; // 3. open the database (open the database file through the specified path, if not, create it) int result = sqlite3_open ([path UTF8String], & sqlite3); if (re Sult! = SQLITE_ OK) {NSLog (@ "failed to open the database! "); Return;} // 4. create an SQL statement // insert into students (id, name) values ('000000', 'riss') NSString * SQL = @ "insert into students (id, name) values (?,?) "; // 5. compile an SQL statement // create a data handle object sqlite3_stmt * stmt = nil; result = sqlite3_prepare_v2 (sqlite3, [SQL UTF8String],-1, & stmt, nil); if (result! = SQLITE_ OK) {NSLog (@ "Compilation failed"); // close the database sqlite3_close (sqlite3); return ;}// 6. bind data to sqlite3_bind_int (stmt, 1, 123457) in the Data handle; sqlite3_bind_text (stmt, 2, "zhangsan",-1, nil); // 7. result = sqlite3_step (stmt); if (result = SQLITE_ERROR | result = SQLITE_MISUSE) {NSLog (@ "insertion failed "); // close the data handle sqlite3_finalize (stmt); // close the database sqlite3_close (sqlite3); return ;}// 8. NSLog (@ "inserted successfully"); // close the data handle sqlite3_finalize (stmt); // close the database sqlite3_close (sqlite3 );}

In android, how does one add columns or update versions to a table after creating a database or table?

// Define the UPDATE function
Private void upgradeDatabaseToVersion1 (SQLiteDatabase db ){
// Add 'new' column to mytable table.
Db.exe cSQL ("alter table mytable add column new TEXT ");
}

// Rewrite onUpgrade
Public void onUpgrade (SQLiteDatabase db, int oldVersion, int currentVersion ){
Log. w (TAG, "Upgrading database from version" + oldVersion
+ "To" + currentVersion + ".");

Switch (oldVersion ){
Case 0:
If (currentVersion <= 1 ){
Return;
}

Db. beginTransaction ();
Try {
UpgradeDatabaseToVersion1 (db );
Db. setTransactionSuccessful ();
} Catch (Throwable ex ){
Log. e (TAG, ex. getMessage (), ex );
Break;
} Finally {
Db. endTransaction ();
}

Return;
}

Log. e (TAG, "Destroying all old data .");
DropAll (db );
OnCreate (db );
}

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In android, how does one add columns to a table after creating a database and a table?

Alter table download_info ADD state Integer