Use JDBC Database Connection Tool Class

// Connect to the driverprivate static final String DRIVER="";
 // Connection pathprivate static final String URL ="jdbc:mysql://localhost:3306/XXX";

import .*;

/**
  * Database connection tool class
  */
public class DataBaseConnectionUtil {
    // Connect to the driver    private static final String DRIVER= "";
    // Connection path    private static final String URL = "jdbc:sqlserver://localhost:1433;DatabaseName=XXX";
    // username    private static final String USERNAME = "sa";
    // password    private static final String PASSWORD = "123456";

    // Static code block    static {
        try {
            // Load the driver            (DRIVERCLASSNAME);
        } catch (ClassNotFoundException e) {
            ();
        }
    }

    /*
      * Get database connection
      */
    public static Connection getConnection() {
        Connection conn = null;
        try{
            conn= (URL, USERNAME, PASSWORD);
        }catch(SQLException e){
            ();

        }
        return conn;
    }

    /*
      * Close the database connection and release the resources
      */
    public static void close(ResultSet rs, PreparedStatement ps, Connection conn) {
        if(rs!=null){
            try{
                ();
                rs=null;
            }catch(SQLException e){
                ();
            }
        }
        if(ps!=null){
            try{
                ();
                ps=null;
            }catch(SQLException e){
                ();
            }
        }
        if(conn!=null){
            try{
                ();
                conn=null;
            }catch(SQLException e){
                ();
            }
        }
    }
    /*
      * Close the database connection and release the resources
      */
    public static void close2( PreparedStatement ps, Connection conn) {
        if(ps!=null){
            try{
                ();
                ps=null;
            }catch(SQLException e){
                ();
            }
        }
        if(conn!=null){
            try{
                ();
                conn=null;
            }catch(SQLException e){
                ();
            }
        }
    }
}

public void AAA() {
    try {
        //Connect the database        conn = ();
        String sql = "sqlStatement（Usually placeholders are left here？ likeinsert into Test (A,B,C,D) values(?,?,?,?)）";
        ps = (sql);
        (1, A);
        (2, B);
        (3, C);
        (4, D);
        // Execute SQL statements        ();
    } catch (SQLException e) {
        ();
    } finally {
        // Close the database connection object        DataBaseConnectionUtil.close2(ps, conn);
    }
}