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feat(postgres_java): added class JavaPostgreSqlRetrieve.java

This commit is contained in:
dancingCycle 2021-12-09 10:46:39 -05:00
parent 589da9cd4b
commit d22cd25e37
2 changed files with 39 additions and 2 deletions
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4
postgres_java/pom.xml
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@ -38,7 +38,7 @@
<artifactId>exec-maven-plugin</artifactId>
<version>1.6.0</version>
<configuration>
<mainClass>de.swingbe.postgres_java.JavaPostgreSqlPrepared
<mainClass>de.swingbe.postgres_java.JavaPostgreSqlRetrieve
</mainClass>
</configuration>
</plugin>
@ -85,7 +85,7 @@
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<manifestEntries>
<Main-Class>
de.swingbe.postgres_java.Main
de.swingbe.postgres_java.JavaPostgreSqlRetrieve
</Main-Class>
</manifestEntries>
</transformer>

37
postgres_java/src/main/java/de/swingbe/postgres_java/JavaPostgreSqlRetrieve.java Normal file
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@ -0,0 +1,37 @@
package de.swingbe.postgres_java;
import java.sql.*;
import java.util.logging.Level;
import java.util.logging.Logger;
public class JavaPostgreSqlRetrieve {
public static void main(String[] args) {
String url = "jdbc:postgresql://localhost:5432/testdb";
String user = "usr";
String password = "#password";
//get all columns from a table
String query = "SELECT * FROM authors";
//create prepared statement using placeholders instead of directly writing values
try (Connection con = DriverManager.getConnection(url, user, password);
PreparedStatement pst = con.prepareStatement(query);
ResultSet rs = pst.executeQuery()) {
//advance cursor to the next record
//return false if there are no more records in the result set
while (rs.next()) {
System.out.print(rs.getInt(1));
System.out.print(" | ");
System.out.println(rs.getString(2));
}
} catch (SQLException ex) {
Logger lgr = Logger.getLogger(JavaPostgreSqlRetrieve.class.getName());
lgr.log(Level.SEVERE, ex.getMessage(), ex);
}
}
}