如何在jooq中管理DSLContext? (紧密连接) [英] How to manage DSLContext in jooq? (close connection)

问题描述

这是我实现所需的每个jooq查询的方式.

This is how I implement each jooq query that i want.

UtilClass{

 //one per table more or less
 static void methodA(){

  //my method
  Connection con = MySQLConnection.getConexion(); //open
  DSLContext create = DSL.using(con, SQLDialect.MYSQL); //open

  /* my logic and jooq querys */ //The code !!!!!!!

  try {

    if ( con != null )
       con.close(); //close
  } catch (SQLException e) {

  } //close

  con=null; //close
  create=null; //close
 }
}

我在这里工作过度吗? /将上下文和连接保持打开状态安全吗?

Am I overworking here? / Is it safe to leave the Context and Connection Open?

如果可以安全地将其保持打开状态，那么我宁愿每个UtilClass使用1个静态字段DSLContext(并且只有注释的部分在我的方法中).因为要封装每个表中的方法(或多或少)，所以我将为每个UtilClass打开一个连接.

In case it is safe to leave it open I would rather work with 1 static field DSLContext per UtilClass (and only the commented section would be on my methods). I would be opening a connection for each UtilClass since I am encapsulating the methods per table (more or less).

推荐答案

DSLContext通常不是资源，因此您可以将其保持打开"状态，即可以让垃圾收集器为您收集它.

DSLContext is usually not a resource, so you can leave it "open", i.e. you can let the garbage collector collect it for you.

但是，JDBC Connection是一种资源，作为所有资源，您应该始终显式关闭它.在Java 7+中，关闭资源的正确方法是使用try-with-resources语句:

A JDBC Connection, however, is a resource, and as all resources, you should always close it explicitly. The correct way to close resources in Java 7+ is by using the try-with-resources statement:

static void methodA() {
    try (Connection con = MySQLConnection.getConexion()) {
        DSLContext ctx = DSL.using(con, SQLDialect.MYSQL); //open

        /* my logic and jooq queries */

        // "ctx" goes out of scope here, and can be garbage-collected
    }   // "con" will be closed here by the try-with-resources statement
 }

有关try-with-resources语句的更多信息，请参见此处.另请注意，上述情况的例外是，当您让您的DSLContext实例管理Connection本身时，例如通过传递如下的连接URL:

An exception to the above is when you let your DSLContext instance manage the Connection itself, e.g. by passing a connection URL as follows:

try (DSLContext ctx = DSL.using("jdbc:url:something", "username", "password")) {
}

在这种情况下，您将需要如上图所示close() DSLContext

In this case, you will need to close() the DSLContext as shown above

这篇关于如何在jooq中管理DSLContext? (紧密连接)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！