Grails GORM如何在我的应用程序中加载现有的远程数据库表

Question

I need to use some tables from a MySQL database which is not mine. I can connect to the database remotely (with known host, db name, user, password). I know the structure of the database but I don't want to create new tables, modify a structure of existing tables etc.

The only thing I want to do is to load records (rows) from this DB in my application and modify its column values or add a new row...

Can you give me some advice please? How to set it in my grails 2.4.3 application?

Answer 1

You can create a new Groovy sql instance like below

import groovy.sql.Sql
...
final Sql sql = Sql.newInstance("jdbc:postgresql://localhost:5432/<db-name>",
                <user>, 
                <password>, 
                "org.postgresql.Driver")
sql.eachRow( 'select * from tableName' ) { println "$it.id -- ${it.firstName} --" }

Detailed info can be seen here: http://groovy.codehaus.org/Tutorial+6+-+Groovy+SQL

You could add mysql/oracle details instead of postgres.