How to add pictures to mysql

How to add pictures to mysql: First create a method to read pictures using FileInputStream; then connect to the database and write sql statements, and use PreparedStatement to execute sql statements.

The operating environment of this tutorial: Windows 7 system, mysql version 8.0.22. This method is suitable for all brands of computers.

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How to add pictures to mysql:

1. Effect

Isn’t it saving a string? You can look at the data type on the left.

2. Get blob data

We create a method to read the image using FileInputStream, and ByteArrayOutputStream will read Write the fetched data into the byte[] array, and then

public static byte[] getImgStr(String path) throws IOException {
        FileInputStream fis = new FileInputStream(path);
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int len = 0;
        byte[] b = new byte[1024];
        while ((len = fis.read(b))!= -1){
            out.write(b,0,len);
        }
        //接收out
        byte[] array = out.toByteArray();
        fis.close();
        out.close();
        return array;
    }

3. Connect to the database and write the sql statement

Use Blob to create a Blob, and then add the data we obtained Convert the image data to blob type, and then use PreparedStatement to execute the sql statement, because it supports placeholders and has a setBlob method that can directly write the value in our blob address to the database. And then you're done.

    public static void main(String[] args) {
        /*
        加载驱动
         */
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            //获取连接
            String url = "jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC";
            String user= "root";
            String password ="123456";
            try {
                Connection connection = DriverManager.getConnection(url,user,password);
                /*
                插入图片
                 */
                byte[] arr = getImgStr("图片地址");
                Blob blob = connection.createBlob();
                blob.setBytes(1,arr);
                String sql = "insert into pictures (name,pic,date) values('张三',?,'2015-01-01')";
                PreparedStatement ps = connection.prepareStatement(sql);
                ps.setBlob(1,blob);
                ps.executeUpdate();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        } catch (ClassNotFoundException | IOException e) {
            e.printStackTrace();
        }
    }

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