在mysql中，Play framework 2.2.2的演变不会被触发

在示例todo应用程序播放中文档中，使用mysql创建tasks表并不是在创建演进。我试着用

applyEvolutions.default=true

在application.conf中。甚至尝试用

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可以使其正常工作。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

如需进一步参考，请访问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;

检查以下各项：

您的evolution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。我的意思是说

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，检查您是否已经设置了自动应用于application.conf的evolutions和down evolutions，并且evolutionplugin设置为enabled

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

注意：在application.conf中有DapplyDownEvolutions

    # 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=""

除了应用程序的配置之外，还有一些其他需要检查的事项：

您提供的登录凭据有效吗

目标数据库中是否有表？我会确保所有的桌子都被抹掉，包括play_evolutions

尝试使用“testuser”手动创建架构，可能登录名没有使用CREATE的权限

---

希望这能有所帮助。

此外，请确保

libraryDependencies += evolutions

在您的

build.sbt

中，因为它已成为一个外部模块

---

关于进化的更多信息：

他们有关于mysql进化的日志吗？非常感谢。我被困在默认文件夹中，我把它命名为“sql\U测试”。将文件夹更改为“默认”有效。谢谢。