我需要创建单独的POJO,它将设置/获取sql ResultSet并在我的项目代码中使用它的方法,如下所示。我创建了以下2个类
public class Tester3
{
public MyResultSet test() throws SQLException{
MyResultSet mrs = new MyResultSet();
PreparedStatement ps = null;
String values = null;
boolean flag = false;
String one = "'12'";
String two = "'jt'";
String a = null;
String b = null;
try {
if(flag==true)
{
values = "'3%'";
a =null;
b = "OR id IN(\'" +a+ "\')";
}else
{
values = "'%'";
a = one + "," + two;
b = "AND id IN("+a+")";
}
String sql = "SELECT * FROM veracodetable where orts like PARAM RAMAN";
sql = sql.replaceFirst("PARAM", values);
sql = sql.replaceFirst("RAMAN", b);
System.out.println("SQL: "+sql);
ps = new Connection1().getConnection().prepareStatement(sql);
ps.executeQuery();
mrs.setRs(ps.executeQuery());
System.out.println("ResultSet: "+mrs.getRs().next());
} catch (SQLException e) {
e.printStackTrace();
}
return mrs;
}
public static void main(String[] args) throws SQLException {
Tester3 t = new Tester3();
MyResultSet rs = t.test();
System.out.println("ResultSet: "+rs.getRs().next());
}
}
public class MyResultSet {
ResultSet rs = null;
public ResultSet getRs() {
return rs;
}
public void setRs(ResultSet rs) {
this.rs = rs;
}
}
当使用单独的POJO MyResultSet 执行上面的代码时,我在ResultSet中没有得到任何结果。但是,如果我跳过POJO实现并直接使用resultSet,我就能得到结果。
rs.getRs()完全是在调用吗?如果没有,为什么?
答案 0 :(得分:-1)
I would separate the statements as they dont't perform the same function, and then populate;
PreparedStatemet ps = null;
ResultSet rs = null;
if(flag){
String stmt = "...?...?";
ps = con.preparedStatement(stmt);
ps.setString(0,a);
ps.setString(1,b);
rs = ps.executeQuery;
}else{
String stmt = "...?...?";
ps = con.preparedStatement(stmt);
ps.setString(0,a);
ps.setString(1,b);
rs = ps.executeQuery;
}
}