Pierwszy odczyt bazy danych

PC22-BazyDanych/.gitignore

+/target/
+
+/.settings/
+/.classpath
+/.project
+
+/*.iml
+/.idea/
+
+/hr.db
+/employees.xml
+/eksport.csv

PC22-BazyDanych/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.example</groupId>
+    <artifactId>PC22-BazyDanych</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.postgresql</groupId>
+            <artifactId>postgresql</artifactId>
+            <version>42.7.3</version>
+            <scope>runtime</scope>
+        </dependency>
+    </dependencies>
+    
+</project>
\ No newline at end of file

PC22-BazyDanych/src/main/java/na_zajeciach/podstawy/OdczytajOsoby.java

+package na_zajeciach.podstawy;
+
+import java.math.BigDecimal;
+import java.sql.*;
+
+// JDBC Java Database Connectivity
+public class OdczytajOsoby {
+    public static void main(String[] args) {
+        try(Connection c = DriverManager.getConnection("jdbc:postgresql://localhost:5432/alx",
+                "alx", "abc123")) {
+            System.out.println("Mam połączenie: " + c);
+
+            try(PreparedStatement stmt = c.prepareStatement("SELECT * FROM osoby");
+                ResultSet rs = stmt.executeQuery()) {
+                while(rs.next()) {
+                    int id = rs.getInt(1); // albo rs.getInt("id");
+                    String imie = rs.getString("imie");
+                    String nazwisko = rs.getString("nazwisko");
+                    Date dataUr = rs.getDate("data_ur");
+                    BigDecimal pensja = rs.getBigDecimal("pensja");
+                    System.out.printf("%d: %s %s, ur. %s, pensja: %s%n", id, imie, nazwisko, dataUr, pensja);
+                }
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}