java - 创建自定义 gradle 任务来获取 mysql 架构

Question

我正在尝试编写一个自定义 Gradle 任务，该任务将从 .sql 文件中获取 mysql 创建和插入语句。这就是我的想法:-

task initdb() {
    def mysql = buildscript.configurations.classpath.find { it.toString().contains("mysql-connector-java") }
//    URLClassLoader loader = GroovyObject.class.classLoader

    def db = [url: "jdbc:mysql://127.0.0.1/",
              user: "root", password: "admin", driver: 'com.mysql.cj.jdbc.Driver']
    def sql = groovy.sql.Sql.newInstance(db.url, db.user, db.password, db.driver)
}

我收到一条错误消息，提示未找到驱动程序类。我在这里做错了什么？

Answer 1

Gradle 任务的类路径和项目的类路径不是一回事。 此外，Gradle 任务的配置和执行是两个不同的事情。

您需要以下内容:

buildscript {
    repositories {
        mavenCentral() // assuming your driver can be found there, if not, a custom repository
    }
    dependencies {
        // Add the driver, and its dependencies, to the buildscript classpath
        classpath "<driver dependency coordinates>"
    }
}

task initdb() {
    doLast {// Make sure the code is run during execution phase and not configuration phase
        def mysql = buildscript.configurations.classpath.find { it.toString().contains("mysql-connector-java") }
        //    URLClassLoader loader = GroovyObject.class.classLoader

        def db = [url: "jdbc:mysql://127.0.0.1/",
          user: "root", password: "admin", driver: 'com.mysql.cj.jdbc.Driver']
        def sql = groovy.sql.Sql.newInstance(db.url, db.user, db.password, db.driver)
    }
}