小编Adr*_*onk的帖子

我有一个使用的Maven pom <packaging>war</packaging>.但实际上,我不想构建war文件,我只想要收集所有依赖的jar并创建一个完整的部署目录.

所以我正在运行war:exploded生成部署目录的目标:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-war-plugin</artifactId>
    <executions>
        <execution>
            <phase>package</phase>
            <configuration>
                <webappDirectory>target/${env}/deploy</webappDirectory>
                <archiveClasses>true</archiveClasses>
            </configuration>
            <goals>
                <goal>exploded</goal>
            </goals>
        </execution>
    </executions>
</plugin>

问题是,战争文件仍然建立.是否有一种简单的方法来<packaging>war</packaging>执行war:exploded目标而不是战争:战争目标？

或者还有另一种简单的方法吗？

我已经用C语言编程了几十年了.在某个地方,我决定不再想写:

if (var)    // in C
if ($var)   # in Perl

当我的意思是:

if (var != 0)
if (defined $var and $var ne '')

我认为部分原因是我有一个强类型的大脑,在我看来,"if"需要一个布尔表达式.

或者也许是因为我使用Perl这么多,Perl中的真相和虚假就是这样一个雷区.

或者也许只是因为这些天,我主要是一名Java程序员.

你有什么偏好？为什么？

我有许多使用Postgres"Partitioning"功能的表.我想在每个表上定义一个常见的BEFORE INSERT OF ROW触发器,1)如果针对父表发生插入,则动态创建分区; 2)对分区重新执行插入.

就像是:

CREATE OR REPLACE FUNCTION partition_insert_redirect( )
RETURNS trigger AS $BODY$
BEGIN
  ... create the new partition and set up the redirect Rules ...

  /* Redo the INSERT dynamically.  The new RULE will redirect it to the child table */
  EXECUTE 'INSERT INTO ' || quote_ident(TG_TABLE_SCHEMA) || '.' || quote_ident(TG_TABLE_NAME) ||
          ' SELECT NEW.*'
END

但是在EXECUTE SQL中看不到"NEW"记录.我怎样才能尽可能简单地完成这项工作？

作为替代方案,我可以以某种方式迭代新记录中的字段吗？

我想过使用临时表:

EXECUTE 'CREATE TEMPORARY TABLE new_row (LIKE ' ||
        quote_ident(TG_TABLE_SCHEMA) || '.' || quote_ident(TG_TABLE_NAME) ||
        ') ON …

我正在考虑使用Annotations来定义我的Hibernate映射,但遇到了一个问题:我想使用基本实体类来定义公共字段(包括ID字段),但我希望不同的表具有不同的ID生成策略:

@MappedSuperclass
public abstract class Base implements Serializable {
    @Id
    @Column(name="ID", nullable = false)
    private Integer id;
    public Integer getId(){return id;}
    public void setId(Integer id){this.id = id;}
    ...
}

@Entity
@Table(name="TABLE_A")
public class TableA extends Base {
    // Table_A wants to set an application-defined value for ID
    ...
}

@Entity
@Table(name="TABLE_B")
public class TableB extends Base {
    // How do I specify @GeneratedValue(strategy = AUTO) for ID here?
    ...
}

有办法做到这一点吗？我已经尝试将以下内容包含在内,TableB但是hibernate反对我有两次相同的列,这似乎是错误的:

@Override // So that we can set …

我刚刚重构了我的数据库,以便在Postgres 8.2中使用分区.现在我的查询性能有问题:

SELECT *
FROM my_table
WHERE time_stamp >= '2010-02-10' and time_stamp < '2010-02-11'
ORDER BY id DESC
LIMIT 100;

表中有4500万行.在分区之前,这将使用反向索引扫描并在达到限制时立即停止.

分区后(在time_stamp范围内),Postgres对主表和相关分区进行完整索引扫描并合并结果,对它们进行排序,然后应用限制.这需要太长时间.

我可以解决它:

SELECT * FROM (
  SELECT *
  FROM my_table_part_a
  WHERE time_stamp >= '2010-02-10' and time_stamp < '2010-02-11'
  ORDER BY id DESC
  LIMIT 100) t
UNION ALL
SELECT * FROM (
  SELECT *
  FROM my_table_part_b
  WHERE time_stamp >= '2010-02-10' and time_stamp < '2010-02-11'
  ORDER BY id DESC
  LIMIT 100) t
UNION ALL
  ... and so on ... …

使用 java 11 运行 Maven 构建，构建在运行测试时发出以下警告：

[WARNING] Corrupted STDOUT by directly writing to native stream in forked JVM 1. See FAQ web page and the dump file /home/thomas/code/irdeto-control/fps-license-service/fps/target/surefire-reports/2019-04-11T14-05-32_318-jvmRun1.dumpstream

...在构建失败后出现以下 stderr 输出：

$ cat error.message 
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.22.1:test (default-test) on project fps: There are test failures.
[ERROR] 
[ERROR] Please refer to /home/user/code/employer-control/fps-license-service/fps/target/surefire-reports for the individual test results.
[ERROR] Please refer to dump files (if any exist) [date].dump, [date]-jvmRun[N].dump and [date].dumpstream.
[ERROR] The forked VM terminated without properly saying …

我一直在掌握Marpa解析器,当第一个符号是可选的时遇到了问题.这是一个例子:

use strict;
use warnings;
use 5.10.0;

use Marpa::R2;
use Data::Dump;

my $grammar = Marpa::R2::Scanless::G->new({source  => \<<'END_OF_GRAMMAR'});
:start ::= Rule
Rule ::= <optional a> 'X'
<optional a> ~ a *
a ~ 'a'
END_OF_GRAMMAR

my $recce = Marpa::R2::Scanless::R->new({grammar => $grammar});
dd $recce->read(\"X");

当我运行它时,我收到以下错误:

Error in SLIF parse: No lexemes accepted at line 1, column 1
* String before error:
* The error was at line 1, column 1, and at character 0x0058 'X', ...
* here: X
Marpa::R2 exception at …