SqLite&Gradle

Question

我在build.gradle中添加了SQLite:

dependencies {
        compile 'org.xerial:sqlite-jdbc:3.8.9.1'
    }

buildscript {
    repositories {
        jcenter()
        mavenCentral()      
    }
    dependencies {
        classpath 'org.xerial:sqlite-jdbc:3.8.9.1'
    }
}

一旦我想在代码中连接到SQLite DB:

 groovy.sql.Sql.newInstance(dbLocation, "org.sqlite.JDBC")

它抱怨说:

java.lang.ClassNotFoundException: org.sqlite.JDBC

是什么原因？我该如何解决？

Answer 1

问题是您需要将JDBC驱动程序放入根类加载器而不是仅仅在通用类路径上.

你有几个选择.其中一个是使用自己的configuration,然后通过GroovyObject以下方式操作根类加载器:

import groovy.sql.Sql

configurations {
    sqllite
}

repositories {
    mavenCentral()
}

dependencies {
    sqllite 'org.xerial:sqlite-jdbc:3.8.9.1'
}

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

Sql sql = Sql.newInstance('jdbc:sqlite:test.db', "org.sqlite.JDBC")

task checkSql << {
    sql.execute 'CREATE TABLE TIM(name CHAR(50))'
    sql.eachRow('SELECT * FROM sqlite_master') { row ->
        logger.lifecycle row.toString()
    }
}

然后运行gradle checkSql应导致:

$ gradle checkSql
:checkSql
[type:table, name:TIM, tbl_name:TIM, rootpage:2, sql:CREATE TABLE TIM(name CHAR(50))]

BUILD SUCCESSFUL

Total time: 4.374 secs

至少,它在Gradle 2.9中有效