quartz 2.2.1 jdbc 连接池参数配置

最新推荐文章于 2023-05-31 10:31:36 发布

转载最新推荐文章于 2023-05-31 10:31:36 发布 · 200 阅读

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原文链接：http://www.cnblogs.com/snowlove67/p/4958406.html

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#数据库

本文详细介绍了Quartz连接池配置的各项参数，包括连接驱动、连接字符串、用户名、密码等基本信息，以及连接池的最大连接数、预编译语句缓存数量等高级配置。特别针对MySQL断开连接的问题，提出了通过设置特定参数来解决的方法。

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   /** The JDBC database driver. */指定连接驱动
   public static final String DB_DRIVER = "driver";

     /** The JDBC database URL. */  连接字符串
    public static final String DB_URL = "URL";


    /** The database user name. */ 用户名
    public static final String DB_USER = "user";

    /** The database user password. */ 密码
    public static final String DB_PASSWORD = "password";

    /** The maximum number of database connections to have in the pool.  Default is 10. */ 连接池最大连接数
    public static final String DB_MAX_CONNECTIONS = "maxConnections";

    /** 
     * The maximum number of prepared statements that will be cached per connection in the pool.
     * Depending upon your JDBC Driver this may significantly help performance, or may slightly 
     * hinder performance.   
     * Default is 120, as Quartz uses over 100 unique statements. 0 disables the feature. 
     */     每个链接最多缓存多少个预编译语句
    public static final String DB_MAX_CACHED_STATEMENTS_PER_CONNECTION = "maxCachedStatementsPerConnection";

    /** 
     * The database sql query to execute every time a connection is returned 
     * to the pool to ensure that it is still valid. 
     */  验证连接是否可用的查询语句
    public static final String DB_VALIDATION_QUERY = "validationQuery";

    /** 
     * The number of seconds between tests of idle connections - only enabled
     * if the validation query property is set.  Default is 50 seconds. 
     */   多久验证空闲连接
    public static final String DB_IDLE_VALIDATION_SECONDS = "idleConnectionValidationSeconds";

    /** 
     * Whether the database sql query to validate connections should be executed every time 
     * a connection is retrieved from the pool to ensure that it is still valid.  If false,
     * then validation will occur on check-in.  Default is false. 
     */  是否每次从池中取连接时，验证连接可用性
    public static final String DB_VALIDATE_ON_CHECKOUT = "validateOnCheckout";
    
    /** Discard connections after they have been idle this many seconds.  0 disables the feature. Default is 0.*/   空闲连接超过多少秒丢弃
    private static final String DB_DISCARD_IDLE_CONNECTIONS_SECONDS = "discardIdleConnectionsSeconds"; 

    /** Default maximum number of database connections in the pool. */  最大连接数
    public static final int DEFAULT_DB_MAX_CONNECTIONS = 10;

    /** Default maximum number of database connections in the pool. */   默认每个链接缓存120个预编译语句
    public static final int DEFAULT_DB_MAX_CACHED_STATEMENTS_PER_CONNECTION = 120;

quartz连接池配置对C3PO连接池配置进行了一些封装，留作记录。

mysql 断开连接可以通过设置 validateOnCheckout=true + validationQuery

或者设置discardIdleConnectionsSeconds 少于8小时解决。

转载于:https://www.cnblogs.com/snowlove67/p/4958406.html