publicintAddNewUser(User user){intresult = conn.Insert(user);returnresult; } TheInsertmethod returns anint, which represents the number of rows inserted into the table. In this case, that number is one. To retrieve rows from a table, use theTablemethod. This method returns a collection of...
ExecuteInsert() Execute this SQL statement and return the ID of the row inserted due to this call. ExecuteUpdateDelete() Execute this SQL statement, if the number of rows affected by execution of this SQL statement is of any importance to the caller - for example, UPDATE / DELETE SQL ...
You can specify a WHERE condition with an expression if you want to delete some specific rows. Only the rows for which the expression evaluates to true will be deleted. For example, “DELETE FROM guru WHERE id > 5” – this will delete only the records that have id larger than 5. Exam...
('Rick', 'Minerich', 29)"); db.ExecuteNonQuery("INSERT INTO Persons (first, last, age) " + "VALUES ('Talbott', 'Crowell', 35)"); DataTable table = db.ExecuteQuery("SELECT * FROM Persons"); foreach (DataRow row in table.Rows) { Console.WriteLine("{0} {1} {2}", row[0],...
7 rows selected. *sga中有一个table queue内存给消费者发送数据,每对(生产者&消费者)对应一个table queue处理2组从属进程间通信,table queue 可以放在shared pool,也可以large pool (其实table queue就是 px msg pool),当10G SGA_TARGET>0 or 11g memory_target>0时 都是存在large pool,parallel_automatic_...
# 插入一名学生的信息 cursor.execute("INSERT INTO students (name, age) VALUES (?, ?)", ('Alice', 25)) 4. 查询数据 查询数据是数据库操作中最常用的功能之一。SELECT语句用于从表格中检索数据。 # 查询所有学生的信息 cursor.execute("SELECT * FROM students") rows = cursor.fetchall for row in...
sql="INSERT INTO users (name, age) VALUES (%s, %s)"val= ("Alice",30) cursor.execute(sql, val) # 查询数据 cursor.execute("SELECT * FROM users") rows=cursor.fetchall()forrowinrows: print(row) # 提交并关闭连接 conn.commit()
conn.execute('INSERTINTOusers(name, age)VALUES('张三',25)')conn.execute('INSERTINTOusers(name, age)VALUES('李四',30)')conn.commit() 查询数据 使用execute()方法执行SQL语句来查询数据,并使用fetchall()方法获取查询结果。 cursor = conn.execute('SELECT * FROM users')rows = cursor.fetchall()for...
# 插入一名学生的信息cursor.execute('INSERT INTO students (name, age) VALUES (?, ?)', ('Alice',25)) 4. 查询数据 查询数据是数据库操作中最常用的功能之一。SELECT语句用于从表格中检索数据。 # 查询所有学生的信息cursor.execute('SELECT * FROM students')rows = cursor.fetchall()forrowinrows:prin...
for row in rows: print(row) 1. 2. 3. 4. 5. 索引的使用 为了提高查询效率,可以在经常用于搜索的列上创建索引。 # 创建索引 c.execute('CREATE INDEX IF NOT EXISTS name_index ON COMPANY (NAME)') 1. 2. 备份和恢复数据库 可以使用sqlite3模块来备份和恢复数据库。