//int ret = mysql_query(&mysql, "select * from student;"); // 等效于下面一行代码 //int ret = mysql_query(&mysql, sql); int ret = mysql_real_query(&mysql, sql, (unsigned long)strlen(sql)); printf("执行查询语句,查询返回结果:%d\n", ret); if (ret) { printf("数据查询失败!失...
考虑一种特殊情况,在insert语句执行的过程中,如果innodb的数据页数据确实在Buffer Pool保存上了,但是数据还没写入到磁盘中,由于各种不可预知的异常,导致mysql服务器突然死机,那么这些插入的数据是不是就丢了。 丢一部分也可以理解,关键如果全丢了呢?那么原本执行成功的业务数据是不是就彻底消失了? 作为一款成熟且广泛...
intmain(intargc,char*argv[]) { MYSQL my_connection; intres; mysql_init(&my_connection); if(mysql_real_connect(&my_connection,"localhost","root","mysql","mysql",0, NULL,0)) { printf("Connection success\n"); res = mysql_query(&my_connection,"INSERT INTO children(fname, age) VALUES...
The return value ofmysql_insert_id()can be simplified to the following sequence: If there is anAUTO_INCREMENTcolumn, and an automatically generated value was successfully inserted, return the first such value. IfLAST_INSERT_ID(expr)occurred in the statement, returnexpr, even if there was anAUT...
MYSQL my_connection; intres; mysql_init(&my_connection); if(mysql_real_connect(&my_connection,"localhost","root","mysql","mysql",0, NULL,0)) { printf("Connection success\n"); res = mysql_query(&my_connection,"INSERT INTO children(fname, age) VALUES('david', 8)"); ...
1. 宏观统计slow.log,经过统计发现慢SQL呈现出批量慢的情况,记录到slow.log的SQL类型比较多,有select、insert、delete、update、commit和 show开头的管理类SQL, [root@big hao]# less slow.log |grep "# Tim"|awk -F "." '{print $1}'|termsql -0 "sel...
C# 操作MySQL数据库, ExecuteNonQuery()方法执行T-SQL语句, INSERT INTO, 插入数据 --ExecuteNonQuery() 对连接执行 Transact-SQL 语句并返回受影响的行数,如果SQL语句是对数据库的记录进行操作(如记录的增加、删除和更新),那么方法将返回操作所影响的记录条数。
Changes in MySQL Connector/NET 8.0.28 功能优化 加快了 Serverless 实例的唤醒时间。 问题修复 修复了用户通过 flink cdc gtid 订阅遇到的兼容性问题,防止用户通过 flink 订阅数据时出现报错场景。 修复全文索引时执行大事务 INSERT 操作阻塞其它事务写入的问题。
mysql_real_connect(mysql,"localhost","root","123456","scott",0,NULL,0)){printf("error:%s",mysql_error(mysql));return1;}// 没有返回结果集的操作intresult;result=mysql_query(mysql,"insert into emp values(8888, 'YYYY', 'CLERK', 7782, '1990-04-10', 1500, NULL, 50);");if(result...
The return value ofmysql_insert_id()can be simplified to the following sequence: If there is anAUTO_INCREMENTcolumn, and an automatically generated value was successfully inserted, return the first such value. IfLAST_INSERT_ID(expr)occurred in the statement, returnexpr, even if there was anAUT...