为什么 DB2 Type 4 JDBC Driver 正在寻找本机库 db2jcct2?

Why is DB2 Type 4 JDBC Driver looking for native library db2jcct2?(为什么 DB2 Type 4 JDBC Driver 正在寻找本机库 db2jcct2?)

问题描述

我认为 Type 4 JDBC 驱动程序是纯 Java 并且不需要本地库.

I thought the Type 4 JDBC driver was pure Java and wouldn't require native libraries.

当我将 db2jcc4.jar 放入打包为 .war 文件的 Tomcat 应用程序的 WEB-INF/lib 目录中时，尝试使用该应用程序时出现以下错误:Got SQLException: com.ibm.db2.jcc.am.SqlException: [jcc][10389][12245][4.12.55] 加载原生库 db2jcct2 失败，java.lang.UnsatisfiedLinkError

When I put db2jcc4.jar in the WEB-INF/lib directory of my Tomcat app packaged as a .war file, I get the following error when attempting to use the app: Got SQLException: com.ibm.db2.jcc.am.SqlException: [jcc][10389][12245][4.12.55] Failure in loading native library db2jcct2, java.lang.UnsatisfiedLinkError

相关应用代码如下，由于清单最后一行而抛出异常:

The relevant application code is as follows and the exception is thrown due to the last line in the listing:

        import com.ibm.db2.jcc.DB2SimpleDataSource;

        // ...

        DB2SimpleDataSource main_db2_data_source = new DB2SimpleDataSource();
        main_db2_data_source.setUser(main_database_user);
        main_db2_data_source.setPassword(main_database_password);
        main_db2_data_source.setServerName(main_database_host);
        try {
          Integer main_database_port_integer = Integer.parseInt(main_database_port);
          main_db2_data_source.setPortNumber(main_database_port_integer);
        } catch (NumberFormatException exception) {
          throw new WebException("...");
        }
        Connection main_connection = null;
        try {
          main_connection = main_db2_data_source.getConnection();

推荐答案

我怀疑问题是你没有告诉它使用类型 4 驱动程序 - 同一个 jar 文件包含类型 4 和类型 2 驱动程序，我相信.

I suspect the problem is that you haven't told it to use the type 4 driver - the same jar file contains both type 4 and type 2 drivers, I believe.

试试:

main_db2_data_source.setDriverType(4);

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