ssxlulu commented on issue #4280: Why the readOnly filed in the ShardingConnection is true. URL: https://github.com/apache/incubator-shardingsphere/issues/4280#issuecomment-591213529 I have researched some documents. The default value of read only in [MySQL](https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_transaction_read_only) or [PostgreSQL](https://www.postgresql.org/docs/current/runtime-config-client.html) is false.Like the following pictures show: MySQL:  PostgreSQL:  So, I think the read only value in AbstractConnectionAdapter should be false as well by default.
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