Postgres Jdbc Driver ~repack~ May 2026
pstmt.setFetchSize(1000); // avoids memory overflow ✅ in development ✅ Close ResultSet , Statement , Connection (try-with-resources handles) ✅ Use currentSchema to avoid schema qualification ✅ Monitor with pg_stat_activity ✅ Set ApplicationName for debugging 8.3 Debugging Connection Issues // Enable driver logging java.util.logging.Logger.getLogger("org.postgresql").setLevel(Level.FINE); // Or JVM args -Dorg.postgresql.forceLogger=java.util.logging -Djava.util.logging.config.file=logging.properties 8.4 Connection Validation // Check if connection is alive if (!conn.isValid(5)) // timeout 5 seconds conn = dataSource.getConnection(); // reconnect
// Store JSON PGobject jsonObj = new PGobject(); jsonObj.setType("json"); jsonObj.setValue("\"key\": \"value\""); pstmt.setObject(1, jsonObj); // Read JSON String jsonStr = rs.getString("data"); postgres jdbc driver
// Use dataSource.getConnection() everywhere try (Connection conn = dataSource.getConnection()) // your code try (Connection conn = dataSource.getConnection()
public User findById(long id) String sql = "SELECT id, name, email FROM users WHERE id = ?"; try (Connection conn = dataSource.getConnection(); PreparedStatement pstmt = conn.prepareStatement(sql)) pstmt.setLong(1, id); try (ResultSet rs = pstmt.executeQuery()) if (rs.next()) return new User(rs.getLong("id"), rs.getString("name"), rs.getString("email")); catch (SQLException e) throw new RuntimeException("Database error", e); return null; !-- Check for latest -->
<dependency> <groupId>org.postgresql</groupId> <artifactId>postgresql</artifactId> <version>42.7.3</version> <!-- Check for latest --> </dependency>
CopyManager copyManager = ((PGConnection) conn).getCopyAPI(); String sql = "COPY users (name, email) FROM STDIN"; CopyIn copyIn = copyManager.copyIn(sql); BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(copyIn)); writer.write("Alice\talice@example.com\n"); writer.write("Bob\tbob@example.com\n"); writer.close(); long rows = copyIn.getHandledRowCount(); 7.3 Logical Replication (PG 10+) PGConnection pgConn = conn.unwrap(PGConnection.class); PGReplicationStream stream = pgConn.getReplicationAPI() .replicationStream() .logical() .withSlotName("test_slot") .withSlotOption("proto_version", "1") .withSlotOption("publication_names", "mypub") .start(); while (true) ByteBuffer msg = stream.readPending(); if (msg != null) // process changes