Grails连接mysql数据库

　　1.Grails在连接mysql数据库是如果出现type=InnDe什么什么的错时，最好在将dataSource里面的方言（dialect）的值修改成

dataSource {
    pooled = true
    driverClassName = "com.mysql.jdbc.Driver"
    username = "root"
    password = "root"
    dialect = org.hibernate.dialect.MySQL5InnoDBDialect  
}

　　这样就可以顺利连接数据库

Grails - DataSource.groovy

dataSource {
    pooled = true
    driverClassName = "com.mysql.jdbc.Driver"
    username = "root"
    password = "root"
    dialect = org.hibernate.dialect.MySQL5InnoDBDialect
}
hibernate {
    cache.use_second_level_cache = true
    cache.use_query_cache = false
    cache.region.factory_class = 'net.sf.ehcache.hibernate.EhCacheRegionFactory'
}
// environment specific settings
environments {
    development {
        dataSource {
            dbCreate = "update" // one of 'create', 'create-drop', 'update', 'validate', ''
            url = "jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8"
        }
    }
}