SELECT*FROM table_b WHERE table_b.user_name=table_a.user_name ) UPDATE insqlite3does not support a FROM clause, which makes this a little more work than in other RDBMS. If performance is not satisfactory, another option might be to build up new rows for table_a using a select and jo...
表中字段2) select 表中字段1,表中字段2 from table2;
But you cannot execute DROP TABLE, UPDATE, INSERT or DELETE against the sqlite_master table. The sqlite_master table is updated automatically as you create or drop tables and indices from the database. You can not make manual changes to the sqlite_master table. The schema for TEMPORARY tables...
} sql = "UPDATE COMPANY set SALARY = 25000.00 where ID=2; " \ "SELECT * from COMPANY"; if ((ret = sqlite3_exec(db,sql,callback,(void*)test,&zErrMsg)) != SQLITE_OK ){ printf("Sql error is =%s \n",zErrMsg); return 0; }else{ printf("Table create successfully\n"); } sql...
5.3 改(UPDATE)语法:UPDATE table-name SET colA=valueA, colB=valueB, … [WHERE condition] 只对WHERE匹配到的条目进行修改. 如果不指定WHERE子句, 则会修改所有的记录sqlite> select * from company; id name age address salary --- --- --- --- --- 1 Paul 32 California 20000.0 2 Allen 25 ...
是的,在SQLite中,你可以在INSERT语句上触发UPDATE触发器。触发器是一种特殊的数据库对象,它可以在执行特定的数据库操作(如INSERT、UPDATE、DELETE等)时自动执行相应的操作。 在SQLite中,你可以使用CREATE TRIGGER语句来创建一个触发器。例如,以下语句将在INSERT操作发生时触发名为my_trigger的触发器: 代码语言:txt ...
虽然回调显得代码整齐,但有时候你还是想要非回调的 select 查询。这可以通过 sqlite3_get_table 函数做到。 int sqlite3_get_table(sqlite3*, const char *sql, char ***resultp, int *nrow, int *ncolumn, char **errmsg ); 第1个参数不再多说,看前面的例子。 第2个参数是 sql 语句,跟 sqlite3_exe...
awaitdb.exec('CREATE TABLE tbl (col TEXT)')awaitdb.exec('INSERT INTO tbl VALUES ("test")') Getting a single row constresult=awaitdb.get('SELECT col FROM tbl WHERE col = ?','test')// { col: 'test' } constresult=awaitdb.get('SELECT col FROM tbl WHERE col = ?',['test'])/...
statement.executeUpdate("create table person (id integer, name string)"); statement.executeUpdate("insert into person values(1, 'leo')"); statement.executeUpdate("insert into person values(2, 'yui')"); ResultSet rs = statement.executeQuery("select * from person");while(rs.next()) ...
Select/Insert/Update/Delete using DAOs In order to read from or write to the database, you can use the `BaseDAO' class (async()=>{letuserDAO=newBaseDAO(User,sqldb);letcontactDAO=newBaseDAO(Contact,sqldb);// insert a user:letuser=newUser();user.userId=1;user.userLoginName='donald...