Query data for Java JDBC Connection database and queries for direct use of SQL

Tag:java   jdbc    database    

JDBC package connection is a good premise: systemauthorizingrealm c = new Systemauthorizingrealm (); conn = C.getconnection ();//conn = ((DataSource) Springcontextutil.getbean ("DataSource"). getconnection ()            ;            PreparedStatement PS = conn.preparestatement (SQL);            Ps.setstring (I1, Token.getusername (). Trim ());            Ps.setstring (I2, Encrypt.getmd5 (string.valueof (Token.getpassword ())). Trim ());            System.out.println (Encrypt.getmd5 (string.valueof (Token.getpassword ()));  //when executed here, I can query the data when I put SQL and related parameters into the tool;  ResU Ltset rs = Ps.executequery (); //This is actually printed false, supposedly the data should be true, right?            System.out.println (Rs.next ());    does that help guide you? 

Query data for Java JDBC Connection database and queries for direct use of SQL