1. 使用多个Insert语句 一种处理超过最大长度限制的方法是将一个大的Insert语句拆分成多个较小的Insert语句。例如,如果要插入1000条记录,可以将它们分成10个Insert语句,每个语句插入100条记录。 下面是一个示例代码,演示如何使用多个Insert语句插入数据: INSERT INTO table_name (column1, column2, ...)
1. Basic Insert INSERTINTOproducts(product_name,price)VALUES('Laptop',999.99); This example inserts a single row into the `products` table with values for `product_name` and `price`. 2. Inserting Multiple Rows INSERTINTOemployees(first_name,last_name,position)VALUES('John','Doe','Manager')...
importmysql.connector# 连接到数据库conn=mysql.connector.connect(host='localhost',user='your_username',password='your_password',database='example_db')cursor=conn.cursor()# 执行多条插入语句insert_query=""" INSERT INTO users (name, email) VALUES ('Alice', 'alice@example.com'), ('Bob', 'bo...
(firstname, lastname, email) VALUES ('Mary', 'Moe', 'mary@example.com');"; $sql .= "INSERT INTO MyGuests (firstname, lastname, email) VALUES ('Julie', 'Dooley', 'julie@example.com')"; if ($conn->multi_query($sql) === TRUE) { echo "新记录插入成功"; } else { echo "...
Query OK, 3840000 rows affected (7 min 36.11 sec) Records: 3840000 Duplicates: 0 Warnings: 0 Query OK, 3840000 rows affected (7 min 59.21 sec) Records: 3840000 Duplicates: 0 Warnings: 0 结果:完成了以上修改操作后;384万行数据的插入速度从30小时缩减到了5分20秒,效率得到极大的提升!
The following conditions hold for INSERT ... SELECT statements: Specify IGNORE to ignore rows that would cause duplicate-key violations. The target table of the INSERT statement may appear in the FROM clause of the SELECT part of the query. However, you cannot insert into a table and select...
not include the LIKE pattern-matching operator, for which trailing spaces are significant. For example: mysql> CREATE TABLEnames (mynameCHAR(10)); Query OK, 0 rows affected (0.03 ) mysql> INSERT INTO names VALUES 'Monty'); Query OK, 1 row affected (0.00 sec mysql> SELECT my...
MyISAM:只支持表级锁,用户在操作MyISAM表时,select,update,delete,insert语句都会给表自动加锁,如果加锁以后的表满足insert并发的情况下,可以在表的尾部插入新的数据。 InnoDB:支持事务和行级锁,是innodb的最大特色。行锁大幅度提高了多用户并发操作的新能。但是InnoDB的行锁,只是在WHERE的主键是有效的,非主键的...
The so-called phantom problem occurs within a transaction when the same query produces different sets of rows at different times. For example, if a SELECT is executed twice, but returns a row the second time that was not returned the first time, the row is a “phantom” row. ...
1. Basic Insert INSERT INTO products (product_name, price) VALUES ('Laptop', 999.99); Powered By This example inserts a new row into the products table with specified values for product_name and price. 2. Storing Query Result into Variables SELECT COUNT(*) INTO @total_customers FROM cus...