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java.lang.AbstractMethodError:com.mysql.jdbc.PreparedStatement.setBlob(ILjava/io/InputStream;)V_Java_Mysql_Jdbc_Blob - Fatal编程技术网

java.lang.AbstractMethodError:com.mysql.jdbc.PreparedStatement.setBlob(ILjava/io/InputStream;)V

java.lang.AbstractMethodError:com.mysql.jdbc.PreparedStatement.setBlob(ILjava/io/InputStream;)V,java,mysql,jdbc,blob,Java,Mysql,Jdbc,Blob,我正在尝试将上传的文件保存到MySQL数据库中,如下所示: String firstName = request.getParameter("firstName"); String lastName = request.getParameter("lastName"); InputStream inputStream = null; // input stream of the upload file // obtains the upload file part in this multi

我正在尝试将上传的文件保存到MySQL数据库中,如下所示:

String firstName = request.getParameter("firstName");
String lastName = request.getParameter("lastName");

InputStream inputStream = null; // input stream of the upload file

// obtains the upload file part in this multipart request
Part filePart = request.getPart("photo");
if (filePart != null) {
    // prints out some information for debugging
    System.out.println(filePart.getName());
    System.out.println(filePart.getSize());
    System.out.println(filePart.getContentType());

    // obtains input stream of the upload file
    inputStream = filePart.getInputStream();
}

Connection conn = null; // connection to the database
String message = null;  // message will be sent back to client

try {
    // connects to the database
    DriverManager.registerDriver(new com.mysql.jdbc.Driver());
    conn = DriverManager.getConnection(dbURL, dbUser, dbPass);

    // constructs SQL statement
    String sql = "INSERT INTO image(image,firstName, lastName) values (?, ?, ?)";
    PreparedStatement statement = conn.prepareStatement(sql);

    if (inputStream != null) {
        // fetches input stream of the upload file for the blob column
        statement.setBlob(1, inputStream);
    }

    statement.setString(2, firstName);
    statement.setString(3, lastName);

    // sends the statement to the database server
    int row = statement.executeUpdate();
    if (row > 0) {
        message = "File uploaded and saved into database";
    }
} catch (SQLException ex) {
    message = "ERROR: " + ex.getMessage();
    ex.printStackTrace();
} finally {
    if (conn != null) {
        // closes the database connection
        try {
            conn.close();
        } catch (SQLException ex) {
            ex.printStackTrace();
        }
    }
    // sets the message in request scope
    request.setAttribute("Message", message);

    // forwards to the message page
    getServletContext().getRequestDispatcher("/Message.jsp").forward(request, response);
}
当我运行此命令时,会出现以下错误:

javax.servlet.ServletException: Servlet execution threw an exception

root cause

java.lang.AbstractMethodError: com.mysql.jdbc.PreparedStatement.setBlob(ILjava/io/InputStream;)V
    UploadServlet.doPost(UploadServlet.java:64)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
此错误的原因可能是什么?输入字段名为firstName、lastName和photo

,正如giorgiga在其your JDBC驱动程序版本中所述。更新它或使用旧版本的setBlob

编辑: 摘自乔治加的答案,以防万一林克死了

AbstractMethodError意味着您的JDBC驱动程序的PreparedStatements不实现setBlob(int、InputStream、long)

使用旧的setBlob(int,Blob)或更新驱动程序(Connector/j5.1实现了jdbc4.0,这应该是setBlob(int,InputStream,long)所需要的)

正如giorgiga在其JDBC驱动程序版本中所述。更新它或使用旧版本的setBlob

编辑: 摘自乔治加的答案,以防万一林克死了

AbstractMethodError意味着您的JDBC驱动程序的PreparedStatements不实现setBlob(int、InputStream、long)

使用旧的setBlob(int,Blob)或更新驱动程序(Connector/j5.1实现了jdbc4.0,这应该是setBlob(int,InputStream,long)所需要的)


你应该使用
mysql-connector-java-5.1.7-bin.jar
来完成这项工作。

你应该使用
mysql-connector-java-5.1.7-bin.jar
来完成这项工作。

setBlob的旧版本是什么?这是旧版本我猜setBlob的旧版本是什么?这是旧版本我猜Hey。你是如何解决这个问题的,因为这里的答案对我也不起作用。@Kanchan如果你把它保存在一个文件夹中,并将该图像的路径存储在数据库中会更好。您是如何解决这个问题的,因为这里的答案对我也不起作用。@Kanchan最好将它保存在文件夹中,并将该图像的路径存储在数据库中