How to retrieve all field comments in JDBC?

To obtain the comment information for all fields, you can use the DatabaseMetaData interface in JDBC. Here is an example code:

import java.sql.*;
public class Main {
    public static void main(String[] args) {
        String url = “jdbc:mysql://localhost:3306/database_name”;
        String username = “username”;
        String password = “password”;
        try (Connection connection = DriverManager.getConnection(url, username, password)) {
            DatabaseMetaData metaData = connection.getMetaData();
            ResultSet rs = metaData.getColumns(null, null, “table_name”, null);
            while (rs.next()) {
                String columnName = rs.getString(“COLUMN_NAME”);
                String columnComment = rs.getString(“REMARKS”);
                System.out.println("Column Name: " + columnName);
                System.out.println("Column Comment: " + columnComment);
                System.out.println();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

Please replace the url, username, and password with your own database connection information. In the getColumns method, you need to pass in four parameters: catalog, schema, tableName, and columnNamePattern, you should replace them with your own database catalog, schema, table name, and column name pattern (use null to match all). Then use the getString method to retrieve column names and comments from the result set.