在Java中执行匿名pl / sql块并获取结果集

Question

我想执行匿名PL / SQL，并需要获取结果集对象。我得到了可以通过使用PL / SQL块内的游标完成的代码。

但是PL / SQL块本身将以文本形式来自数据库。因此，我无法编辑该PL / SQL块。并且它将仅返回两个其列名始终相同的值。它将返回2个列组合值的列表。

在这里，我给出示例PL / SQL。

BEGIN

RETURN 'select distinct fundname d, fundname r from <table> where condition order by 1';

EXCEPTION
   WHEN OTHERS THEN
    RETURN 'SELECT ''Not Available'' d, ''Not Available'' r FROM dual';
END;

任何回复都将非常有帮助。

Answer 1

这是一个如何“执行匿名PL / SQL并获取结果集对象”的独立示例。

import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Types;

import oracle.jdbc.OracleTypes;

public class CallPLSQLBlockWithOneInputStringAndOneOutputStringParameterAndOneOutputCursorParameter {

    public static void main(String[] args) throws Exception {

        DriverManager.registerDriver(new oracle.jdbc.OracleDriver());

        // Warning: this is a simple example program : In a long running application,
        // error handlers MUST clean up connections statements and result sets.

        final Connection c = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:XE", "system", "manager");
        String plsql = "" +
        " declare " +  
        "    p_id varchar2(20) := null; " +
        "    l_rc sys_refcursor;" +
        " begin " +
        "    p_id := ?; " +
        "    ? := 'input parameter was = ' || p_id;" +
        "    open l_rc for " +
        "        select 1 id, 'hello' name from dual " +
        "        union " +
        "        select 2, 'peter' from dual; " +
        "    ? := l_rc;" +
        " end;";

        CallableStatement cs = c.prepareCall(plsql);
        cs.setString(1, "12345");
        cs.registerOutParameter(2, Types.VARCHAR);
        cs.registerOutParameter(3, OracleTypes.CURSOR);

        cs.execute();

        System.out.println("Result = " + cs.getObject(2));

        ResultSet cursorResultSet = (ResultSet) cs.getObject(3);
        while (cursorResultSet.next ())
        {
            System.out.println (cursorResultSet.getInt(1) + " " + cursorResultSet.getString(2));
        } 
        cs.close();
        c.close();
    }
}

上面的示例查询“从double联合中选择1 id，’hello’名称，从double选择2，’peter’；可以用任何查询代替。