feat(postgres_java): added class JavaPostgreSqlVersion
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# Overview
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This project shows how Postgres and Java interact.
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# Notes
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The instruction
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```/etc/init.d/postgresql status```
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is equivalent with
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```systemctl status postgresql```
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.
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obx21
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firstairport21
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# Links
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[source](https://zetcode.com/java/postgresql/)
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<build>
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<plugins>
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<!--Set up the following plugin in order to run command line applications from Maven.
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Run the app with mvn -q exec:java command.
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The q runs mvn in quite mode.-->
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<plugin>
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<groupId>org.codehaus.mojo</groupId>
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<artifactId>exec-maven-plugin</artifactId>
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<version>1.6.0</version>
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<configuration>
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<mainClass>de.swingbe.postgres_java.JavaPostgreSqlVersion
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</mainClass>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<transformer
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implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
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<manifestEntries>
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<Main-Class>de.swingbe.postgres_java.Main
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<Main-Class>
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de.swingbe.postgres_java.Main
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</Main-Class>
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</manifestEntries>
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</transformer>
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</plugin>
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</plugins>
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</build>
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<dependencies>
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<!--Add the following dependency to include PostgreSQL Java driver.-->
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<dependency>
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<groupId>org.postgresql</groupId>
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<artifactId>postgresql</artifactId>
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<version>42.3.1</version>
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</dependency>
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</dependencies>
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</project>
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package de.swingbe.postgres_java;
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import java.sql.*;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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public class JavaPostgreSqlVersion {
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public static void main(String[] args) {
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String url = "jdbc:postgresql://localhost:5432/testdb";
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String user = "usr";
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String password = "#password";
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try (Connection con = DriverManager.getConnection(url, user, password);
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Statement st = con.createStatement();
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ResultSet rs = st.executeQuery("SELECT VERSION()")) {
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if (rs.next()) {
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System.out.println(rs.getString(1));
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}
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} catch (SQLException ex) {
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Logger lgr = Logger.getLogger(JavaPostgreSqlVersion.class.getName());
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lgr.log(Level.SEVERE, ex.getMessage(), ex);
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}
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}
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}
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