如何将外部jar文件添加到gradle构建脚本

Question

现在我使用gradle作为我的构建工具。我的一个任务需要访问mysql数据库。下面是我的gradle脚本：

import groovy.sql.Sql

buildscript {
    dependencies {
        classpath files('/usr/share/java/mysql-connector-java.jar')
    }
}


task connectToDb << {
    def props = [user: 'user', password: 'password', allowMultiQueries: 'true'] as Properties
    def url = 'jdbc:mysql://mysqlhost:3306/db'
    def driver = 'com.mysql.jdbc.Driver'
    def sql = Sql.newInstance(url, props, driver)

    sql.eachRow('show tables') { row ->
        println row[0]
    }
}

我尝试在Ubuntu Lucid盒中运行它，但总是失败。gradle报告信息:任务':connectToDb‘执行失败。原因: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

似乎构建脚本没有包含mysql连接器jar library.Can，谁能告诉我如何正确配置外部jar文件？谢谢。

Answer 1

这对我很有效。请参阅此帖子，了解为什么使用http://gradle.1045684.n5.nabble.com/using-jdbc-driver-in-a-task-fails-td1435189.html

import groovy.sql.Sql

repositories {
    mavenCentral()
}
configurations {
    driver
}
dependencies {
    driver group: 'mysql', name: 'mysql-connector-java', version: '5.1.16'
}

URLClassLoader loader = GroovyObject.class.classLoader
configurations.driver.each {File file ->
    loader.addURL(file.toURL())
}

task connectToDb << {
    def props = [user: 'user', password: 'password', allowMultiQueries: 'true'] as Properties
    def url = 'jdbc:mysql://mysqlhost:3306/db'
    def driver = 'com.mysql.jdbc.Driver'
    def sql = Sql.newInstance(url, props, driver)

    sql.eachRow('show tables') { row ->
        println row[0]
    }
}

Answer 2

我有过这样的幸运经历：

buildscript {
    dependencies {
        classpath fileTree(dir: '/usr/share/java',
            includes: ['mysql-connector-java.jar'])
    }
}

不过，坦率地说，在你的情况下，我更喜欢这样：

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'mysql:mysql-connector-java:5.1.16'
    }
}

Answer 3

下面的代码片段适用于在、Microsoft SQL SERVER、中连接和查询数据库。请注意，微软不会将jar文件‘sqljdbc42.jar’(它是jdbc驱动程序)放在任何在线存储库(如MavenCentral() )上。因此，您需要从Microsoft的网站下载此jar，并将其保存在项目工作空间目录中。Download 'sqljdbc_4.2.6420.100_enu.exe'

解压缩下载的文件并转到sqljdbc_ 4.2 --> Microsoft JDBC Driver 4.2 for SQL Server-->enu。在这里，您将看到文件sqljdbc42.jar。将文件复制到项目工作区。我将‘lib’复制到目录中。

            repositories {
                flatDir name: 'localRepository', dirs: 'lib'
            }
            configurations {
                driver
            }
            dependencies {
                driver group: 'sql', name: 'sqljdbc42', version:''
            }


            URLClassLoader loader = GroovyObject.class.classLoader
            configurations.driver.each { File file ->
                loader.addURL(file.toURL())
            }

            task connectToCoreDb << {
                def props = [user: 'sa', password: 'shock', allowMultiQueries: 'true'] as Properties
                def connectionUrl = "jdbc:sqlserver://cpt-op-01-db1:1433;databaseName=buds"
                def driver = 'com.microsoft.sqlserver.jdbc.SQLServerDriver'
                def sql = Sql.newInstance(connectionUrl, props, driver)
                sql.eachRow('SELECT name, alias, expiry_date FROM [buds].[dbo].[obj_keystore] ) { row ->
                    println "$row.name $row.alias $row.expiry_date"
                }
                logger.info "Closing connection..."
                sql.close()
            }