Smalltalk 语言 数据库连接池实战 提升连接效率的实践

Smalltalk阿木 发布于 16 天前 4 次阅读

Smalltalk【1】 语言数据库连接池【2】实战：提升连接效率【4】的实践

在软件开发中，数据库连接是必不可少的。频繁地打开和关闭数据库连接会消耗大量的系统资源，降低应用程序的性能。为了解决这个问题，数据库连接池应运而生。本文将围绕Smalltalk语言，探讨数据库连接池的实现，以及如何通过实践提升连接效率。

Smalltalk 语言简介

Smalltalk是一种面向对象的编程语言，由Alan Kay等人于1970年代初期设计。它以其简洁、直观和强大的面向对象特性而闻名。Smalltalk语言的特点包括：

- 面向对象：Smalltalk是一种纯粹的面向对象语言，所有的数据和行为都封装在对象中。
- 动态类型【5】：Smalltalk在运行时确定对象的类型，这使得Smalltalk具有很高的灵活性。
- 图形用户界面【6】：Smalltalk最初是为了开发图形用户界面而设计的，因此它具有强大的图形界面支持。

数据库连接池概述

数据库连接池是一种数据库连接管理技术，它预先在系统中创建一定数量的数据库连接，并将这些连接存储在一个池中。当应用程序需要访问数据库时，可以从连接池中获取一个连接，使用完毕后再将连接归还【7】到池中。这样可以避免频繁地打开和关闭连接，从而提高应用程序的性能。

Smalltalk 数据库连接池实现

以下是一个简单的Smalltalk数据库连接池实现示例：

```smalltalk
| connectionPool |

Class category: DatabaseConnectionPool [
classVariable: 'connectionPool' value: nil.

classVariable: 'maxConnections' value: 10.

classVariable: 'minConnections' value: 5.

classVariable: 'connectionTimeout【8】' value: 30000.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds【9】'.

classVariable: 'driver' value: 'com.mysql.JDBC【10】.Driver'.

classVariable: 'url' value: 'jdbc:mysql://localhost:3306/mydatabase'.

classVariable: 'username' value: 'root'.

classVariable: 'password' value: 'password'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds【11】: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: 'connectionTimeoutUnit' value: 'milliseconds'.

classVariable: 'connectionTimeoutValue' value: connectionTimeout unitToMilliseconds: connectionTimeoutUnit.

classVariable: '