Question

在播放文档中的示例todo app中，使用mysql创建任务表并未创建演变。我尝试使用

applyEvolutions.default=true

在application.conf中

。甚至尝试用

启动应用程序

start -DapplyEvolutions.default=true

mysql查询也不是问题，因为在mysql控制台中手动输入它使其正常工作。 db连接也没有问题，因为在手动创建表之后，插入和删除操作在应用程序中运行良好。

在这里进一步参考application.conf

    # This is the main configuration file for the application.
# ~~~~~

# Secret key
# ~~~~~
# The secret key is used to secure cryptographics functions.
# If you deploy your application to several instances be sure to use the same key!
application.secret="PwleF1NyxkZ[8Oq`j`^NMg:6Vu6MMiHv?s:Ff>3@VpiKfA^9qSvb/E_>5[BRq>h6"

# The application languages
# ~~~~~
application.langs="en"

# Global object class
# ~~~~~
# Define the Global object class for this application.
# Default to Global in the root package.
# application.global=Global

# Router
# ~~~~~
# Define the Router object to use for this application.
# This router will be looked up first when the application is starting up,
# so make sure this is the entry point.
# Furthermore, it's assumed your route file is named properly.
# So for an application router like `my.application.Router`,
# you may need to define a router file `conf/my.application.routes`.
# Default to Routes in the root package (and conf/routes)
# application.router=my.application.Routes

# Database configuration
# ~~~~~
# You can declare as many datasources as you want.
# By convention, the default datasource is named `default`
#
# db.default.driver=org.h2.Driver
# db.default.url="jdbc:h2:mem:play"
# db.default.user=sa
# db.default.password=""

# Evolutions
# ~~~~~
# You can disable evolutions if needed
# evolutionplugin=disabled
applyEvolutions.default=true

DapplyDownEvolutions.default=true

# Logger
# ~~~~~
# You can also configure logback (http://logback.qos.ch/),
# by providing an application-logger.xml file in the conf directory.

# Root logger:
logger.root=ERROR

# Logger used by the framework:
logger.play=INFO

# Logger provided to your application:
logger.application=DEBUG

db.default.driver=com.mysql.jdbc.Driver
db.default.url="jdbc:mysql://localhost/sql_test"
db.default.user="testuser"
db.default.pass=""

这里是1.sql

# Tasks schema

# --- !Ups

CREATE TABLE task (
    id int NOT NULL AUTO_INCREMENT,
    label varchar(255),
    PRIMARY KEY (ID)
);

# --- !Downs


DROP TABLE task;

Answer 1

检查以下内容：

您的进化文件（1.sql，2.sql等）应该位于conf / evolutions / default /目录中，其中default是您在application.conf中为数据库指定的名称。我的意思是

db.default.driver=com.mysql.jdbc.Driver
db.default.url="jdbc:mysql://localhost/sql_test"
db.default.user="testuser"
db.default.pass=""

接下来，检查您是否已在应用程序中自动应用设置和减少进化.conf并将evolutionplugin设置为启用

evolutionplugin=enabled
applyEvolutions.default=true
applyDownEvolutions.default=true

注意：您的application.conf中有DapplyDownEvolutions

除了您的应用程序配置外，还有其他一些需要检查的事项：

您提供的登录凭据是否有效？
目标数据库中是否有任何表？我会确保所有桌子都被擦除，包括play_evolutions。
尝试使用'testuser'手动创建架构，也许登录无权使用CREATE

希望这有帮助。

Answer 2

此外，请确保您有

libraryDependencies += evolutions

在build.sbt中，因为它已成为外部模块。

有关进化的更多信息：Link

Play框架2.2.2演进不会在mysql中被解雇

2 个答案: