Spring Cloud seata_0.9.0连接本机MySQL_8.0.27数据库失败，
报错如下：
2022-07-14 20:59:35.968 ERRoR[main]io. seata.core.store.db.LogStoreDataBaseDA0.queryTableStructure:567-query transaction_name size fail，Cannot create PoolableConnectionFactory (Could not create connection to database server.)
原因是数据库驱动连不上，
去你自己的本机Maven仓库下拷贝一个相同版本的数据库连接池
放在/seata/lib下面
修改seata/conf/file.conf
## database store
db {
## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp) etc.
datasource = "druid"
## mysql/oracle/h2/oceanbase etc.
db-type = "mysql"
driver-class-name = "com.mysql.cj.jdbc.Driver"
url = "jdbc:mysql://127.0.0.1:3306/seata?useUnicode=true&characterEncoding=utf8&useSSL=false&&serverTimezone=UTC"
user = "root"
password = "root"
min-conn = 1
max-conn = 3
global.table = "global_table"
branch.table = "branch_table"
lock-table = "lock_table"
query-limit = 100
}
再次启动seata/bin/seata-server.bat批处理文件，发现成功
注意：启动seata服务前需要先启动nacos
否则会报：no available server to connect
