当运行到 java class 时出现 ORA-00936 错误

Question

我需要将 OracleDataSource 用于学校项目。我已经在 Oracle Developer 上创建并测试了我的查询，我得到了正确的输出。当我尝试通过 java 代码执行查询时，出现以下错误：java.sql.SQLSyntaxErrorException: ORA-00936: missing expression。我在网上做了一些挖掘，人们说这可能是由于 WHERE 子句。所以我在执行之前打印出查询。查询是这样的： SELECT b.ISBN, b.TITLE, COUNT(*) FROM BOOKS b JOIN BOOK_SUBJECT bs ON bs.ISBN = b.ISBN WHERE bs.SUBJECT_ID IN (47,46,43) GROUP BY b.ISBN, b.TITLE ORDER BY COUNT(*) DESC 如果我在 Developer 中输入相同的查询，它会工作，但是当我运行我的 java class 我得到 ORA 错误。我以这种方式形成我的查询：

  Statement stmt = conn.createStatement();
  String query = "SELECT b.ISBN, b.TITLE, COUNT(*) FROM BOOKS b JOIN BOOK_SUBJECT bs ON bs.ISBN = b.ISBN WHERE bs.SUBJECT_ID IN (";
  PreparedStatement ps = conn.prepareStatement(query);

  for(int i = 0; i < args.length; i++) {
    //int psVar = i + 1; 
    //ps.setInt(psVar, Integer.parseInt(args[i]));
    if(i == args.length - 1) {
        query += args[i] + ")";
    } else {
        query += args[i] + ",";
    }
  }

  query += " GROUP BY b.ISBN, b.TITLE ORDER BY COUNT(*) DESC";

  //Execute the query
  System.out.println(query);
  ResultSet rset = ps.executeQuery();

我迷路了，谢谢你的帮助

Answer 1

您的问题是您在完成查询之前准备查询。将最后一个赋值后的 PreparedStatement ps = conn.prepareStatement(query); 移动到 query，并为每个参数使用占位符：

Statement stmt = conn.createStatement();
String query = "SELECT b.ISBN, b.TITLE, COUNT(*) FROM BOOKS b JOIN BOOK_SUBJECT bs ON bs.ISBN = b.ISBN WHERE bs.SUBJECT_ID IN (";

for(int i = 0; i < args.length; i++) {
  if(i == args.length - 1) {
    query += "?)";
  } else {
    query += "?, ";
  }
}

query += " GROUP BY b.ISBN, b.TITLE ORDER BY COUNT(*) DESC";
PreparedStatement ps = conn.prepareStatement(query);

for(int i = 0; i < args.length; i++) {
  int psVar = i + 1; 
  ps.setInt(psVar, Integer.parseInt(args[i]));
}

ResultSet rset = ps.executeQuery();

当运行到 java class 时出现 ORA-00936 错误

ORA-00936 error when running through java class

java

sql

oracle

ods

当 运行 到 java class 时出现 ORA-00936 错误

ORA-00936 error when running through java class

java

sql

oracle

ods

当运行到 java class 时出现 ORA-00936 错误