To enable Grails to converse with MySQL in version 3.x a few configuration changes are required. Below depicts the default application.yml file.
[codesyntax lang=”groovy”]
---
hibernate:
cache:
queries: false
use_second_level_cache: true
use_query_cache: false
region.factory_class: org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory
dataSource:
pooled: true
jmxExport: true
driverClassName: org.h2.Driver
username: sa
password:
environments:
development:
dataSource:
dbCreate: create-drop
url: jdbc:h2:mem:devDb;MVCC=TRUE;LOCK_TIMEOUT=10000;DB_CLOSE_ON_EXIT=FALSE
test:
dataSource:
dbCreate: update
url: jdbc:h2:mem:testDb;MVCC=TRUE;LOCK_TIMEOUT=10000;DB_CLOSE_ON_EXIT=FALSE
production:
dataSource:
dbCreate: update
url: jdbc:h2:./prodDb;MVCC=TRUE;LOCK_TIMEOUT=10000;DB_CLOSE_ON_EXIT=FALSE
properties:
jmxEnabled: true
initialSize: 5
maxActive: 50
minIdle: 5
maxIdle: 25
maxWait: 10000
maxAge: 600000
timeBetweenEvictionRunsMillis: 5000
minEvictableIdleTimeMillis: 60000
validationQuery: SELECT 1
validationQueryTimeout: 3
validationInterval: 15000
testOnBorrow: true
testWhileIdle: true
testOnReturn: false
jdbcInterceptors: ConnectionState
defaultTransactionIsolation: 2 # TRANSACTION_READ_COMMITTED
---
---
grails:
profile: web
codegen:
defaultPackage: ap01
spring:
transactionManagement:
proxies: false
info:
app:
name: '@info.app.name@'
version: '@info.app.version@'
grailsVersion: '@info.app.grailsVersion@'
spring:
groovy:
template:
check-template-location: false
# Spring Actuator Endpoints are Disabled by Default
endpoints:
enabled: false
jmx:
enabled: true
---
grails:
mime:
disable:
accept:
header:
userAgents:
- Gecko
- WebKit
- Presto
- Trident
types:
all: '*/*'
atom: application/atom+xml
css: text/css
csv: text/csv
form: application/x-www-form-urlencoded
html:
- text/html
- application/xhtml+xml
js: text/javascript
json:
- application/json
- text/json
multipartForm: multipart/form-data
pdf: application/pdf
rss: application/rss+xml
text: text/plain
hal:
- application/hal+json
- application/hal+xml
xml:
- text/xml
- application/xml
urlmapping:
cache:
maxsize: 1000
controllers:
defaultScope: singleton
converters:
encoding: UTF-8
views:
default:
codec: html
gsp:
encoding: UTF-8
htmlcodec: xml
codecs:
expression: html
scriptlets: html
taglib: none
staticparts: none
endpoints:
jmx:
unique-names: true
[/codesyntax]
The modified application.yml file which allows for MySQL connectivity is depicted as follows.
[codesyntax lang=”groovy”]
---
hibernate:
cache:
queries: false
use_second_level_cache: true
use_query_cache: false
region.factory_class: org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory
dataSource:
pooled: true
jmxExport: true
driverClassName: com.mysql.jdbc.Driver
username: user
password: password
environments:
development:
dataSource:
dbCreate: update
url: jdbc:mysql://localhost/gra01?useUnicode=yes&characterEncoding=UTF-8
test:
dataSource:
dbCreate: update
url: jdbc:mysql://localhost/gra01?useUnicode=yes&characterEncoding=UTF-8
production:
dataSource:
dbCreate: update
url: jdbc:mysql://localhost/gra01?useUnicode=yes&characterEncoding=UTF-8
properties:
jmxEnabled: true
initialSize: 5
maxActive: 50
minIdle: 5
maxIdle: 25
maxWait: 10000
maxAge: 600000
timeBetweenEvictionRunsMillis: 5000
minEvictableIdleTimeMillis: 60000
validationQuery: SELECT 1
validationQueryTimeout: 3
validationInterval: 15000
testOnBorrow: true
testWhileIdle: true
testOnReturn: false
jdbcInterceptors: ConnectionState
defaultTransactionIsolation: 2 # TRANSACTION_READ_COMMITTED
---
---
grails:
profile: web
codegen:
defaultPackage: ap01
spring:
transactionManagement:
proxies: false
info:
app:
name: '@info.app.name@'
version: '@info.app.version@'
grailsVersion: '@info.app.grailsVersion@'
spring:
groovy:
template:
check-template-location: false
# Spring Actuator Endpoints are Disabled by Default
endpoints:
enabled: false
jmx:
enabled: true
---
grails:
mime:
disable:
accept:
header:
userAgents:
- Gecko
- WebKit
- Presto
- Trident
types:
all: '*/*'
atom: application/atom+xml
css: text/css
csv: text/csv
form: application/x-www-form-urlencoded
html:
- text/html
- application/xhtml+xml
js: text/javascript
json:
- application/json
- text/json
multipartForm: multipart/form-data
pdf: application/pdf
rss: application/rss+xml
text: text/plain
hal:
- application/hal+json
- application/hal+xml
xml:
- text/xml
- application/xml
urlmapping:
cache:
maxsize: 1000
controllers:
defaultScope: singleton
converters:
encoding: UTF-8
views:
default:
codec: html
gsp:
encoding: UTF-8
htmlcodec: xml
codecs:
expression: html
scriptlets: html
taglib: none
staticparts: none
endpoints:
jmx:
unique-names: true
[/codesyntax]
To complete the process the version of MySQL should be specified in the build.gradle file.
[codesyntax lang=”groovy”]
runtime "mysql:mysql-connector-java:5.1.40"
[/codesyntax]
The only other caveat is to make the MySQL driver available to the Grails application.
The build.gradle file should be modified to represent something like the following.
[codesyntax lang=”groovy”]
buildscript {
repositories {
mavenLocal()
maven { url "https://repo.grails.org/grails/core" }
}
dependencies {
classpath "org.grails:grails-gradle-plugin:$grailsVersion"
classpath "com.bertramlabs.plugins:asset-pipeline-gradle:2.11.1"
classpath "org.grails.plugins:hibernate5:6.0.2"
}
}
version "0.1"
group "ap01"
apply plugin:"eclipse"
apply plugin:"idea"
apply plugin:"war"
apply plugin:"org.grails.grails-web"
apply plugin:"org.grails.grails-gsp"
apply plugin:"asset-pipeline"
repositories {
mavenLocal()
maven { url "https://repo.grails.org/grails/core" }
}
dependencyManagement {
imports {
mavenBom "org.grails:grails-bom:$grailsVersion"
}
applyMavenExclusions false
}
dependencies {
compile "org.springframework.boot:spring-boot-starter-logging"
compile "org.springframework.boot:spring-boot-autoconfigure"
compile "org.grails:grails-core"
compile "org.springframework.boot:spring-boot-starter-actuator"
compile "org.springframework.boot:spring-boot-starter-tomcat"
compile "org.grails:grails-dependencies"
compile "org.grails:grails-web-boot"
compile "org.grails.plugins:cache"
compile "org.grails.plugins:scaffolding"
compile "org.grails.plugins:hibernate5"
compile "org.hibernate:hibernate-core:5.1.1.Final"
compile "org.hibernate:hibernate-ehcache:5.1.1.Final"
console "org.grails:grails-console"
profile "org.grails.profiles:web"
runtime "com.bertramlabs.plugins:asset-pipeline-grails:2.11.1"
runtime "com.h2database:h2"
runtime "mysql:mysql-connector-java:5.1.40"
testCompile "org.grails:grails-plugin-testing"
testCompile "org.grails.plugins:geb"
testRuntime "org.seleniumhq.selenium:selenium-htmlunit-driver:2.47.1"
testRuntime "net.sourceforge.htmlunit:htmlunit:2.18"
}
assets {
minifyJs = true
minifyCss = true
}
[/codesyntax]
Mr. Arch Brooks, Software Engineer, Brooks Computing Systems, LLC authored this article.