sql语句总

sql.append("insert into user(username,sex,email,passwd) values('");

        sql.append(user.getUsername());

        sql.append("',");

        sql.append(user.getSex());

        sql.append(",'");

        sql.append(user.getEmail());

        sql.append("','");

        sql.append(user.getPasswd());

        sql.append("')");

增:(注册)String sql = "insert into user(username,sex,email,passwd) values('" +user.getUsername()+"'," +user.getSex() + 

",'" + user.getEmail() + "','" + user.getPasswd+"'";

 

删:String sql = "delete from user where id=" + id;

 

改:String sql = "update user set passwd='" + passwd + "',sex=" + sex + "where email='" + email + "'";

 

查:(登陆)String sql = "select * from user where username='" + username + "' and passwd='" + passwd + "'"; 

 

增:(注册)String sql = "insert into user(username,email,passwd,sex)values(?,?,?,?)";

 

查:(登陆)String sql = "select * from user where username=? and passwd=?";

 

查:(查询:多条信息)String sql = "select * from user";

 

查:(查询:一条信息)String sql = "select id from user where username='"+username + "'";

 

查:(判断信息是否唯一StateMent)String sql= "select id from user where "+volo+"='"+value+"'";

 

查:(判断信息是否唯一:PrepareStatement)String sql= "select id from user where "+ (type==0 ? "email=":"username=")+"?";

 

查:(mysql分页)String sql = "select * from user order by id desc limit "+startRow+","+size;

 

查:(oracle分页)String sql = "select * from (select rownum r,a.* from(select * from stu order by id desc) a) where r 

between " + begin  + " and " + end;

 

 

 

 

 

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