无法将grails应用程序连接到mySql数据库,无法加载JDBC驱动程序类'com.mysql.jdbc.Driver'

Question

我已经将mysql/j连接器复制到我的grails应用程序的grails-app/lib文件夹中.我的DataSource.groovy文件看起来像这样

dataSource {
    pooled = true
    driverClassName = "com.mysql.jdbc.Driver"
    username = "root"
    password = "password"
}
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 = "create-drop" // one of 'create', 'create-drop', 'update',     'validate', ''
            url = "jdbc:mysql://localhost:3306/tewhareoteata3test"
            dialect = "org.hibernate.dialect.MySQL5InnoDBDialect"
        }
    }
    test {
        dataSource {
            dbCreate = "update"
            url = "jdbc:h2:mem:testDb;MVCC=TRUE;LOCK_TIMEOUT=10000"
        }
    }
    production {
        dataSource {
            dbCreate = "update"
            url = "jdbc:h2:prodDb;MVCC=TRUE;LOCK_TIMEOUT=10000"
            pooled = true
            properties {
               maxActive = -1
               minEvictableIdleTimeMillis=1800000
               timeBetweenEvictionRunsMillis=1800000
               numTestsPerEvictionRun=3
               testOnBorrow=true
               testWhileIdle=true
               testOnReturn=true
               validationQuery="SELECT 1"
            }
        }
    }
}

但它给了我这个错误

Cannot load JDBC driver class 'com.mysql.jdbc.Driver'

Answer 1

在BuildConfig.groovy加

dependencies {
        runtime 'mysql:mysql-connector-java:5.1.16'
    }

事实上,它可能已经被评论出来了.

这告诉grails下载mysql-connector及其依赖项.

您需要告诉Grails使用哪个maven存储库(也在BuildConfig.groovy):

repositories {
        grailsPlugins()
        grailsHome()
        grailsCentral()
        mavenCentral()
    }

Answer 2

取消注释

runtime 'mysql:mysql-connector-java:5.1.20'

在BuildConfig.groovy.