MySQL 自4.1版以后开始支持INSERT … ON DUPLICATE KEY UPDATE语法,使得原本需要执行3条SQL语句(SELECT,INSERT,UPDATE),缩减为1条语句即可完成. 例如ipstats表结构如下: CREATE TABLE ipstats ( ip ) not null unique, clicks ) unsigned not null default '0' ); 原本需要执行3条SQL语句,如下: IF (SELECT * FROM ipstats…
批量SQL提交 参考 21.2.6. Connector/NET Connection String Options Reference . Allow Batch true When true, multiple SQL statements can be sent with one command execution. -Note- Starting with MySQL 4.1.1, batch statements should be separated by the server-de…
error: Failed dependencies: MySQLconflicts 错误提示: error: Failed dependencies: mysql conflicts with mysql-server.i386 原因及解决办法: That means there's an old version MySQL in the current OS, use rpm -e to remove it. rp…