Query Data

SELECT id, balance from accounts;

// 'db' is an open database connection

rows, err := db.Query("SELECT id, balance FROM accounts")
if err != nil {
    log.Fatal(err)
}
defer rows.Close()
fmt.Println("Initial balances:")
for rows.Next() {
    var id, balance int
    if err := rows.Scan(&id, &balance); err != nil {
        log.Fatal(err)
    }
    fmt.Printf("%d %d\n", id, balance)
}

// ds is an org.postgresql.ds.PGSimpleDataSource

try (Connection connection = ds.getConnection()) {
    Statement stmt = connection.createStatement();
    ResultSet rs = stmt.executeQuery("SELECT id, balance FROM accounts");

    while (rs.next()) {
        int id = rs.getInt(1);
        int bal = rs.getInt(2);
        System.out.printf("ID: %10s\nBalance: %5s\n", id, bal);
    }
    rs.close();

} catch (SQLException e) {
    System.out.printf("sql state = [%s]\ncause = [%s]\nmessage = [%s]\n",
                      e.getSQLState(), e.getCause(), e.getMessage());
}

# conn is a psycopg2 connection

with conn.cursor() as cur:
    cur.execute("SELECT id, balance FROM accounts")
    rows = cur.fetchall()
    for row in rows:
        print([str(cell) for cell in row])

SELECT * FROM bank ORDER BY balance;

  id | balance |                                               payload
-----+---------+-------------------------------------------------------------------------------------------------------
   0 |    -500 | initial-dTqnRurXztAPkykhZWvsCmeJkMwRNcJAvTlNbgUEYfagEQJaHmfPsquKZUBOGwpAjPtATpGXFJkrtQCEJODSlmQctvyh
   1 |    -499 | initial-PCLGABqTvrtRNyhAyOhQdyLfVtCmRykQJSsdwqUFABkPOMQayVEhiAwzZKHpJUiNmVaWYZnReMKfONZvRKbTETaIDccE
   2 |    -498 | initial-VNfyUJHfCmMeAUoTgoSVvnByDyvpHNPHDfVoNWdXBFQpwMOBgNVtNijyTjmecvFqyeLHlDbIBRrbCzSeiHWSLmWbhIvh
   3 |    -497 | initial-llflzsVuQYUlfwlyoaqjdwKUNgNFVgvlnINeOUUVyfxyvmOiAelxqkTBfpBBziYVHgQLLEuCazSXmURnXBlCCfsOqeji
   4 |    -496 | initial-rmGzVVucMqbYnBaccWilErbWvcatqBsWSXvrbxYUUEhmOnccXzvqcsGuMVJNBjmzKErJzEzzfCzNTmLQqhkrDUxdgqDD
(5 rows)

SELECT * FROM bank LIMIT 5;

  id | balance |                                               payload
-----+---------+-------------------------------------------------------------------------------------------------------
   0 |       0 | initial-dTqnRurXztAPkykhZWvsCmeJkMwRNcJAvTlNbgUEYfagEQJaHmfPsquKZUBOGwpAjPtATpGXFJkrtQCEJODSlmQctvyh
   1 |       0 | initial-PCLGABqTvrtRNyhAyOhQdyLfVtCmRykQJSsdwqUFABkPOMQayVEhiAwzZKHpJUiNmVaWYZnReMKfONZvRKbTETaIDccE
   2 |       0 | initial-VNfyUJHfCmMeAUoTgoSVvnByDyvpHNPHDfVoNWdXBFQpwMOBgNVtNijyTjmecvFqyeLHlDbIBRrbCzSeiHWSLmWbhIvh
   3 |       0 | initial-llflzsVuQYUlfwlyoaqjdwKUNgNFVgvlnINeOUUVyfxyvmOiAelxqkTBfpBBziYVHgQLLEuCazSXmURnXBlCCfsOqeji
   4 |       0 | initial-rmGzVVucMqbYnBaccWilErbWvcatqBsWSXvrbxYUUEhmOnccXzvqcsGuMVJNBjmzKErJzEzzfCzNTmLQqhkrDUxdgqDD
(5 rows)

SELECT
	a.col1, b.col1
FROM
	some_table AS a
	JOIN
    some_other_table AS b
    ON
    a.id = b.id
WHERE
	a.col2 > 100 AND a.col3 > now()
ORDER BY
	a.col2 DESC
LIMIT
	25;