Question

我在内存数据库中构建了H2用于短期存储。我从一个简短的Java存根和测试连接到数据库，以确保我已成功连接。由于它很短，我已经完整地包含了代码。我已经使用了.isClosed和isValid（0）。关闭始终返回负数（意味着未关闭），isValid（0）始终以正数回答（意味着未关闭）。无论我使用有效凭证还是假冒

，它们都表现得那样

public class H2SeeWhatICabBreak {

public static Connection getConnection()   {
    try {
        Class.forName("org.h2.Driver");
    } catch (ClassNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        System.exit(-1);
    }

    Connection conn = null;
    Properties connectionProps = new Properties();
    connectionProps.put("user", "<username>");
    connectionProps.put("password", "<password>");
    try {
        conn = DriverManager.getConnection("jdbc:h2:~/tickets");
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        System.exit(-1);
    }

    return conn;
}

public static void main(String[] args) throws SQLException {

        Connection dbCTX = getConnection();

        if (dbCTX == null ) {
            System.err.println("Got back a null, good bye!!");
            System.exit(-1);
        }

        if (dbCTX.isClosed())
        {
            System.err.println("There's something rotten in River City");
        } else {
            System.err.println("Got connection");
        }

        System.err.println("Looks like we did it??");


    }
}

有什么想法吗？

Answer 1

您创建并设置baseQuery := ` SELECT * FROM tableName WHERE (name ILIKE $1)` params := []interface{}{"%" + nameLike + "%"} // you can add optional criteria using this way if condition==true { baseQuery += fmt.Sprintf(` AND student_no=$%d`, len(params)+1) params = append(params, studentNo) } filterQuery := baseQuery + ` ORDER BY contract_no ASC` if totalLimit != 0 { filterQuery += fmt.Sprintf(` LIMIT $%d OFFSET $%d`, len(params)+1, len(params)+2) params = append(params, totalLimit, totalSkip) } rows, err := db.Query(filterQuery, params...)，但实际上。您的代码等同于以下内容。请注意，H2的默认用户名和密码是空字符串。

connectionProps

或

conn = DriverManager.getConnection("jdbc:h2:~/tickets");

或

conn = DriverManager.getConnection("jdbc:h2:~/tickets", "", "");

或

conn = DriverManager.getConnection("jdbc:h2:~/tickets", null);

您要做的是：

conn = DriverManager.getConnection("jdbc:h2:~/tickets", new Properties());

或（更复杂）：

conn = DriverManager.getConnection("jdbc:h2:~/tickets", 
    "<username>", "<password>");

H2数据库isClosed / isValid报告“未关闭”，即使使用虚假凭据也是如此

1 个答案: