Question

我正在尝试通过JDBC对Oracle DB执行查询。我已经验证它在SQL Developer中有效。但是当我通过JDBC运行它时，我在

上得到一个“null”值

ps = con.prepareStatement(sql.toString());

我尝试过不同的语句和SQL查询，所有这些都在SQL开发人员的工作中完成。另外，我没有得到任何堆栈跟踪来调试..

查询1

      sql.append("SELECT * FROM Tabel WHERE (ID1=" + id + " AND ORG=" + org + ") OR (ID2=" + id + " AND ORG=" + org + ")");

QUERY2

sql.append("SELECT * FROM Tabel WHERE (ID1=" + id + " OR ID2=" + id + ") AND ORG=?" + org);

QUERY3

sql.append("SELECT * FROM Tabel WHERE (ID1=? OR ID2=?) AND ORG=?");
ps = con.prepareStatement(sql.toString());
ps.setString(1, id);
ps.setString(2, id);
ps.setString(3, org);

代码

try {
  log.debug("Creating Query");
  StringBuffer sql = new StringBuffer();
  sql.append("SELECT * FROM Table WHERE (ID1=? OR ID2=?) AND ORG=?");
  log.debug("Query created: " + sql.toString()); //Don't get here
  ps = con.prepareStatement(sql.toString());
  ps.setString(1, id);
  ps.setString(2, id);
  ps.setString(3, org);
  log.debug("Query Created!!!!");
  con = getConnection();
} catch (Exception e) {
  log.error("Could not create statement in methodXXX");
  //Returns null in e.getMessage()
  throw new Exception("Could not create query: " + e.getMessage()); 
}

//亨利克

Answer 1

只需使用以下方式

ps = con.prepareStatement("SELECT * FROM Tabel WHERE (ID1=? OR ID2=?) AND ORG=?");
ps.setString(1, id);
ps.setString(2, id);
ps.setString(3, org)
ResultSet rs=ps.executeQuery();
while(rs.next())
{
//use your code to retrieve like rs.getString(1);
}

JDBC：无法创建语句

1 个答案: