Projekt 22 BazyMaven

PC22-BazyDanychMaven/.gitignore

+/target/
+
+/.settings/
+/.classpath
+/.project
+
+/*.iml
+/.idea/

PC22-BazyDanychMaven/pom.xml

+<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>pl.alx.kjava</groupId>
+	<artifactId>PC22-BazyDanychMaven</artifactId>
+	<version>1.0-SNAPSHOT</version>
+
+	<properties>
+		<maven.compiler.source>17</maven.compiler.source>
+		<maven.compiler.target>17</maven.compiler.target>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.postgresql</groupId>
+			<artifactId>postgresql</artifactId>
+			<version>42.6.0</version>
+			<scope>runtime</scope>
+		</dependency>
+	</dependencies>
+
+</project>

PC22-BazyDanychMaven/src/main/java/bazy/na_zywo/Odczyt1.java

+package bazy.na_zywo;
+
+import java.sql.*;
+
+public class Odczyt1 {
+    // JDBC = Java Database Connectivity
+
+    public static void main(String[] args) {
+        try {
+            Connection c = DriverManager.getConnection("jdbc:postgresql://localhost/postgres",
+                    "postgres", "abc123");
+            System.out.println("Mam połączenie: " + c);
+
+            PreparedStatement stmt = c.prepareStatement("SELECT * FROM osoby");
+            ResultSet rs = stmt.executeQuery();
+            while(rs.next()) {
+                System.out.println(rs.getString(2) + " " + rs.getString(3));
+            }
+            c.close();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}

PC22-BazyDanychMaven/src/main/java/bazy/na_zywo/Odczyt2.java

+package bazy.na_zywo;
+
+import java.sql.*;
+
+public class Odczyt2 {
+   public static void main(String[] args) {
+       String url = "jdbc:postgresql://localhost:5432/postgres";
+       try (Connection c = DriverManager.getConnection(url, "postgres", "abc123");
+           PreparedStatement stmt = c.prepareStatement("SELECT * FROM osoby");
+           ResultSet rs = stmt.executeQuery()) {
+           while (rs.next()) {
+               System.out.printf("Osoba nr %d to jest %s %s, ur. %s, zarabia %s%n",
+                       rs.getInt("id"),
+                       rs.getString("imie"),
+                       rs.getString("nazwisko"),
+                       rs.getString("data_urodzenia"),
+                       rs.getBigDecimal("pensja"));
+           }
+       } catch (SQLException e) {
+           throw new RuntimeException(e);
+       }
+   }
+}
+