Flyway迁移，无法从数据源获取Jdbc连接

Question

public class FlywayMigration
{
    public FlywayMigration(DatabaseConfiguration configuration, Flyway flyway)
    {
        flyway.setDataSource(configuration.getDataSource());
        flyway.migrate();
    }

    public static void main(String[] args)
    {
        new FlywayMigration(new DatabaseConfiguration("database.properties"), new Flyway());
    }
}

public class DatabaseConfiguration
{
    private final Logger LOGGER = LoggerFactory.getLogger(this.getClass());

    private PropertiesUtil prop = null;

    public DatabaseConfiguration(String file)
    {
        prop = new PropertiesUtil(file);
    }

    public String getDataSourceClass()
    {
        return prop.getProperty("mysql.data.source.class");
    }

    public String getURL ()
    {
        return prop.getProperty("mysql.url");
    }

    public String getHostName()
    {
        return prop.getProperty("mysql.host.name");
    }

    public String getDatabaseName()
    {
        return prop.getProperty("mysql.database.name");
    }

    public DataSource getDataSource()
    {
        MysqlDataSource dataSource = new MysqlDataSource();
        dataSource.setURL(getURL());
        dataSource.setUser(prop.getProperty("mysql.user.name"));
        dataSource.setPassword(null);
        return dataSource;
    }
}

mysql.data.source.class=com.mysql.jdbc.Driver    
mysql.url=jdbc:mysql://localhost:3306/vmrDB    
mysql.host.name=localhost    
mysql.database.name=vmrDB    
mysql.user.name=root

Exception in thread "main" org.flywaydb.core.api.FlywayException: Unable to obtain Jdbc connection from DataSource
    at org.flywaydb.core.internal.util.jdbc.JdbcUtils.openConnection(JdbcUtils.java:56)
    at org.flywaydb.core.Flyway.execute(Flyway.java:1144)
    at org.flywaydb.core.Flyway.migrate(Flyway.java:811)
    at com.bt.sitb.vmr.migration.FlywayMigration.<init>(FlywayMigration.java:10)
    at com.bt.sitb.vmr.migration.FlywayMigration.main(FlywayMigration.java:15)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

有人能告诉我为什么来自MySQL的数据源没有连接。谢谢！

Answer 1

看起来Flyway无法连接到数据库。

这其中的一个原因是数据库URL中的数据库不存在。

问题：您的数据库模式存在吗？

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