The Grails environment for this example is Grails 3.2.2, Groovy 2.4.7 and JVM 1.8.0_92.
To allow Grails to converse with MySQL these following steps should be followed.
First change the build.gradle file to include the MySQL driver as depicted below.
[codesyntax lang=”groovy”]
buildscript {
repositories {
mavenLocal()
maven { url "https://repo.grails.org/grails/core" }
}
dependencies {
classpath "org.grails:grails-gradle-plugin:$grailsVersion"
classpath "com.bertramlabs.plugins:asset-pipeline-gradle:2.11.1"
classpath "org.grails.plugins:hibernate5:6.0.2"
}
}
version "0.1"
group "books"
apply plugin:"eclipse"
apply plugin:"idea"
apply plugin:"war"
apply plugin:"org.grails.grails-web"
apply plugin:"org.grails.grails-gsp"
apply plugin:"asset-pipeline"
repositories {
mavenLocal()
maven { url "https://repo.grails.org/grails/core" }
}
dependencyManagement {
imports {
mavenBom "org.grails:grails-bom:$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"
compile "org.grails.plugins:spring-security-core:3.1.1"
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]
Next change the application.yml file to describe the connection for the database.
[codesyntax lang=”actionscript3″]
---
grails:
profile: web
codegen:
defaultPackage: books
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
---
hibernate:
cache:
queries: false
use_second_level_cache: true
use_query_cache: false
region.factory_class: org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory
dataSource:
pooled: true
driverClassName: "com.mysql.jdbc.Driver"
dialect: "org.hibernate.dialect.MySQL5InnoDBDialect"
environments:
development:
dataSource:
dbCreate: "update"
url: "jdbc:mysql://localhost/database?useUnicode=yes&characterEncoding=UTF-8"
username: "user"
password: "password"
test:
dataSource:
dbCreate: update
url: "jdbc:mysql://localhost/database?useUnicode=yes&characterEncoding=UTF-8"
username: "user"
password: "password"
production:
dataSource:
dbCreate: none
url: "jdbc:mysql://localhost/database?useUnicode=yes&characterEncoding=UTF-8"
username: "user"
password: "password"
properties:
jmxEnabled: true
initialSize: 5
maxActive: 50
minIdle: 5
maxIdle: 25
maxWait: 10000
maxAge: 10 * 60000
timeBetweenEvictionRunsMillis: 5000
minEvictableIdleTimeMillis: 60000
validationQuery: "SELECT 1"
validationQueryTimeout: 3
validationInterval: 15000
testOnBorrow: true
testWhileIdle: true
testOnReturn: false
jdbcInterceptors: "ConnectionState;StatementCache(max=200)"
defaultTransactionIsolation: java.sql.Connection.TRANSACTION_READ_COMMITTED
[/codesyntax]
Now you should issue the Grails run-app command at the command line as depicted below.
If there are no errors Grails should be conversant with MySQL at this point. The resulting successful output is depicted below.
The coast is clear for further utilization of MySQL in your grails app.
Mr. Arch Brooks, Software Engineer, Brooks Computing Systems, LLC authored this article.