Postgres Jdbc Driver 〈2026〉

conn.setAutoCommit(false); try (PreparedStatement pstmt = conn.prepareStatement("INSERT INTO logs (msg) VALUES (?)")) for (String msg : messages) pstmt.setString(1, msg); pstmt.addBatch(); int[] results = pstmt.executeBatch(); conn.commit(); catch (SQLException e) conn.rollback();

8.1 Common Errors | Error | Solution | |-------|----------| | The connection attempt failed | Check PostgreSQL running, firewall, pg_hba.conf | | No suitable driver found | Add JDBC jar to classpath | | FATAL: no pg_hba.conf entry | Add client IP/method to pg_hba.conf | | PSQLException: This connection has been closed | Reconnect or use connection pool | | PSQLException: Out of memory | Increase JVM heap or reduce result set size | 8.2 Best Practices Checklist ✅ Always use PreparedStatement (prevents SQL injection) ✅ Use try-with-resources for automatic closing ✅ Implement connection pooling (HikariCP) ✅ Set reasonable timeouts (connect, socket, login) ✅ Use fetchSize for large result sets postgres jdbc driver

String insert = "INSERT INTO users (name, email) VALUES (?, ?)"; try (PreparedStatement pstmt = conn.prepareStatement(insert, Statement.RETURN_GENERATED_KEYS)) pstmt.setString(1, "John"); pstmt.setString(2, "john@example.com"); pstmt.executeUpdate(); ResultSet keys = pstmt.getGeneratedKeys(); if (keys.next()) long id = keys.getLong(1); int[] results = pstmt.executeBatch()

https://jdbc.postgresql.org/documentation/head/ catch (SQLException e) conn.rollback()