java.sql.SQLSyntaxErrorException: ORA-00903: 无效的表名

Question

我在 Java 应用程序的下拉列表中包含所有表名。我想在 JLabel 上的表中显示记录数。但我收到以下错误

java.sql.SQLSyntaxErrorException: ORA-00903: 无效的表名

我试过这个：

try {
        String tableName = LoginFrame.userName + "." +    this.ddlTableName.getSelectedItem().toString();
        JOptionPane.showMessageDialog(null, tableName);
        pst = (OraclePreparedStatement) con.prepareStatement("select count(*) as num from '" + tableName + "'");
        rs = pst.executeQuery();
        while (rs.next()) {
            this.lblRecordStat.setText(rs.getString("num"));
        }
    } catch (SQLException ex) {
        JOptionPane.showMessageDialog(null, ex);
        System.out.println(ex);
    }

Answer 1

在 Oracle 中，引号 ( 's) 用于表示字符串文字。对象名称（例如表）不应被它们包围。丢失引号，你应该没问题：

pst = (OraclePreparedStatement) con.prepareStatement
          ("select count(*) as num from " + tableName);