Postgresql11.3 下安裝PL/java

Postgesql原生內部不支持java編寫函數，觸發器，存儲過程，這裏需要第三方插件PL/java，這裏介紹一下，如何安裝PL/java。

安裝gcc-c++, gcc, java 1.8.x, openssl

# yum install gcc* openssl* java-1.8.0-openjdk java-1.8.0-openjdk-devel
# java -version
openjdk version "1.8.0_242"
OpenJDK Runtime Environment (build 1.8.0_242-b07)
OpenJDK 64-Bit Server VM (build 25.242-b07, mixed mode)
# gcc --version
gcc (GCC) 6.2.0
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

安裝Apache Maven

wget http://mirror.easyname.ch/apache/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.tar.gz
tar -zxvf apache-maven-3.3.9-bin.tar.gz
mv apache-maven-3.3.9 /usr/local/
cd apache-maven-3.3.9
mvn -version
Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-11T00:41:47+08:00)
Maven home: /usr/local/apache-maven-3.3.9
Java version: 1.8.0_151, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.151-1.b12.el6_9.x86_64/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "2.6.32-642.3.1.el6.x86_64", arch: "amd64", family: "unix"

安裝postgresql11.3（略）
下載PL/java,這裏沒有下git 的master版本，下載了以前的穩定版本。

wget https://github.com/tada/pljava/archive/V1_5_2.tar.gz
tar -xvf V1_5_2.tar.gz
cd pljava-1_5_2/
mvn clean install
[INFO] Executed tasks
[INFO] 
[INFO] --- maven-install-plugin:2.5.2:install (default-install) @ pljava-packaging ---
[INFO] Installing /home/postgres/pljava-1_5_2/pljava-packaging/pom.xml to /home/postgres/.m2/repository/org/postgresql/pljava-packaging/1.5.2/pljava-packaging-1.5.2.pom
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO] 
[INFO] PostgreSQL PL/Java ................................. SUCCESS [  4.954 s]
[INFO] PL/Java API ........................................ SUCCESS [  1.435 s]
[INFO] PL/Java backend Java code .......................... SUCCESS [  0.488 s]
[INFO] PL/Java backend native code ........................ SUCCESS [  7.580 s]
[INFO] PL/Java Deploy ..................................... SUCCESS [  0.189 s]
[INFO] PL/Java Ant tasks .................................. SUCCESS [  0.113 s]
[INFO] PL/Java examples ................................... SUCCESS [  0.109 s]
[INFO] PL/Java packaging .................................. SUCCESS [  1.572 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 17.410 s
[INFO] Finished at: 2020-03-18T10:11:53+08:00
[INFO] Final Memory: 62M/2055M
[INFO] ------------------------------------------------------------------------

cd pljava-1_5_2/
java -jar  pljava-packaging/target/pljava-pg11.3-amd64-Linux-gpp.jar
/opt/pgsql11.3/lib/libpljava-so-1.5.2.so as bytes
/opt/pgsql11.3/share/pljava/pljava-1.5.2.jar as bytes
/opt/pgsql11.3/share/pljava/pljava-api-1.5.2.jar as bytes
/opt/pgsql11.3/share/pljava/pljava-examples-1.5.2.jar as bytes
/opt/pgsql11.3/share/extension/pljava.control as lines (ASCII)
/opt/pgsql11.3/share/pljava/pljava--1.5.2.sql as lines (UTF8)
/opt/pgsql11.3/share/pljava/pljava--unpackaged--1.5.2.sql as lines (UTF8)
/opt/pgsql11.3/share/pljava/pljava--1.5.1--1.5.2.sql as lines (UTF8)
/opt/pgsql11.3/share/pljava/pljava--1.5.1-BETA3--1.5.2.sql as lines (UTF8)
/opt/pgsql11.3/share/pljava/pljava--1.5.1-BETA2--1.5.2.sql as lines (UTF8)
/opt/pgsql11.3/share/pljava/pljava--1.5.1-BETA1--1.5.2.sql as lines (UTF8)
/opt/pgsql11.3/share/pljava/pljava--1.5.0--1.5.2.sql as lines (UTF8)
/opt/pgsql11.3/share/pljava/pljava--1.5.0-BETA3--1.5.2.sql as lines (UTF8)
/opt/pgsql11.3/share/pljava/pljava--1.5.0-BETA2--1.5.2.sql as lines (UTF8)
/opt/pgsql11.3/share/pljava/pljava--1.5.0-BETA1--1.5.2.sql as lines (UTF8)

postgres系統用戶環境變量

cat ~/.bash_profile 
# .bash_profile
# Get the aliases and functions
if [ -f ~/.bashrc ]; then
        . ~/.bashrc
fi
# User specific environment and startup programs

PATH=$PATH:$HOME/bin

export PATH

export PS1="$USER@`/bin/hostname -s`-> "
export PGUSER=hank
export PGPORT=1921
export PGDATA=/opt/pgdata11.3/pg_root
export LANG=en_US.utf8
export PGHOME=/opt/pgsql11.3
export LD_LIBRARY_PATH=$PGHOME/lib:/lib64:/usr/lib64:/usr/local/lib64:/lib:/usr/lib:/usr/local/lib:
export DATE=`date +"%Y%m%d%H%M"`
export PATH=$PGHOME/bin:/usr/local/apache-maven-3.3.9/bin:$PATH:.
export MANPATH=$PGHOME/share/man:$MANPATH
alias rm='rm -i'
alias ll='ls -lh'
export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:$PKG_CONFIG_PATH
export JAVA_HOME=/usr/local/jdk1.8.0_121
export CLASSPATH=/usr/local/jdk1.8.0_121/lib/ext

另外，maven倉庫地址需要修改一下，因爲從maven的中央倉庫下載速度太慢，我們修改使用阿里雲的倉庫,修改添加以下內容

vi /usr/local/apache-maven-3.3.9/conf/settings.xml
修改
 <mirror>
   <id>alimaven</id>
   <name>aliyun maven</name>
   <url>
       http://maven.aliyun.com/nexus/content/groups/public/
   </url>
   <mirrorOf>central</mirrorOf>        
 </mirror>

 <profile>
   <id>NEXUS2</id>
   <repositories>
           <repository>
                   <!-- 用maven.aliyun.com替換中央庫 central -->
                   <id>maven-aliyun</id>
                   <name>public repository in maven.aliyun.com</name>
                   <url>http://maven.aliyun.com/nexus/content/groups/public</url>
                   <snapshots>
                           <enabled>false</enabled>
                   </snapshots>
           </repository>
           <repository>
                   <id>snapshots3.46</id>
                   <name>release repository in 3.46</name>
                   <url>http://172.16.3.46:8081/nexus/content/groups/public-snapshots</url>
                   <releases>
                           <enabled>true</enabled>
                   </releases>
                   <snapshots>
                           <enabled>true</enabled>
                   </snapshots>
           </repository>
   </repositories>
   <pluginRepositories>
           <pluginRepository>
                   <id>maven-aliyun</id>
                   <name>public repository in maven.aliyun.com/</name>
                   <url>http://maven.aliyun.com/content/groups/public/</url>
                   <snapshots>
                           <enabled>false</enabled>
                   </snapshots>
           </pluginRepository>
   </pluginRepositories>
 </profile>


<activeProfiles>
    <activeProfile>NEXUS2</activeProfile>
</activeProfiles>

注意：
我的本地倉庫是在/home/postgres/.m2/repository，如果mvn clean insall 失敗，可以刪除該本地倉庫，讓其重新下載安裝。

進入數據庫，安裝插件

psql -h 127.0.0.1
hank=# \c hank postgres
You are now connected to database "hank" as user "postgres".
hank=# create extension pljava ;
WARNING:  Java virtual machine not yet loaded
DETAIL:  libjvm: cannot open shared object file: No such file or directory
HINT:  SET pljava.libjvm_location TO the correct path to the jvm library (libjvm.so or jvm.dll, etc.)
ERROR:  cannot use PL/Java before successfully completing its setup
HINT:  Check the log for messages closely preceding this one, detailing what step of setup failed and what will be needed, probably setting one of the "pljava." configuration variables, to complete the setup. If there is not enough help in the log, try again with different settings for "log_min_messages" or "log_error_verbosity".

出現以上錯誤，說明沒有正確配置pljava.libjvm_location參數，找到匹配的libjvm.so文件，在postgresql.conf添加路徑配置

find / -name "*libjvm.so*"
/usr/local/jdk1.8.0_121/jre/lib/amd64/server/libjvm.so
/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.201.x86_64/jre/lib/amd64/server/libjvm.so
/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.242.b07-1.el6_10.x86_64/jre/lib/amd64/server/libjvm.so
/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre/lib/x86_64/client/libjvm.so
/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre/lib/x86_64/server/libjvm.so

vi postgresql.conf
pljava.libjvm_location='/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.242.b07-1.el6_10.x86_64/jre/lib/amd64/server/libjvm.so'

重載配置：
pg_ctl reload

再次安裝插件
hank=# \c hank postgres
You are now connected to database "hank" as user "postgres".
hank=# create extension pljava ;
CREATE EXTENSION
hank=# \dx pljava 
                               List of installed extensions
  Name  | Version | Schema |                         Description                          
--------+---------+--------+--------------------------------------------------------------
 pljava | 1.5.2   | sqlj   | PL/Java procedural language (https://tada.github.io/pljava/)

hank=# CREATE FUNCTION getsysprop(VARCHAR)
hank-# RETURNS VARCHAR
hank-# AS 'java.lang.System.getProperty'
hank-# LANGUAGE java;
CREATE FUNCTION
hank=# SELECT getsysprop('user.home');
   getsysprop   
----------------
 /home/postgres
(1 row)

參考：
https://tada.github.io/pljava/install/install.html#PLJava_configuration_variables
https://raghavt.blog/install-pl-java-1-5-2-in-postgresql-11/

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