Oracle_PL-SQL_JavaSource_13

JAVA Source

	有的時候，我們需要在Oracle的Prodedure、Function中調用JAVA代碼來實現功能，比方說下面的這個例子，調用JAVA代碼來實現大小寫金額的轉換，如果這個代碼用PL實現，難度還是有的，那如果我們先寫成JAVA代碼，然後通過調用，來實現，還是可以的。

創建

--create or replace and compile java source named javasource_name
--as
--package package_name
/*
* java code here
*/


CREATE or replace and compile java source named js_translater
AS
package com.yzupope.util;
/*
* 人民幣大小寫金額轉化
*/
public class XhgUtil {


  private static final String UNIT = "萬千佰拾億千佰拾萬千佰拾元角分";


  private static final String DIGIT = "零壹貳叄肆伍陸柒捌玖";


  private static final double MAX_VALUE = 9999999999999.99D;


  public static String trans(double v) {
    if (v < 0 || v > MAX_VALUE)
      return "參數非法!";
    long l = Math.round(v * 100);//round(double a):返回最接近參數的long(返回值爲static long)

    if (l == 0)
      return "零元整";
    String strValue = l + "";
    // j用來控制單位
    int j = UNIT.length() - strValue.length();
    String rs = "";
    boolean isZero = false;
    // i用來控制數
    for (int i = 0; i < strValue.length(); i++, j++) {
      char ch = strValue.charAt(i);
      if (ch == '0') {
        isZero = true;
        if (UNIT.charAt(j) == '億' || UNIT.charAt(j) == '萬'
            || UNIT.charAt(j) == '元') {
          rs = rs + UNIT.charAt(j);
          isZero = false;
        }
      } else {
        if (isZero) {
          rs = rs + "零";
          isZero = false;
        }
        rs = rs + DIGIT.charAt(ch - '0') + UNIT.charAt(j);
      }
    }
    if (!rs.endsWith("角") && !rs.endsWith("分")) {
      rs = rs + "整";
    }
    rs = rs.replaceAll("億萬", "億");
    return rs;
  }
}

創建引用

CREATE OR REPLACE FUNCTION xchg(v NUMBER) RETURN VARCHAR2
AS
LANGUAGE JAVA NAME com.yzupope.util.XhgUtil.trans(double)return java.lang.String';

函數調用

select xchg(105.91) FROM dual;

Where are java classes stored in Oracle?（如何查看呢）

SELECT object_name, object_type, status, TIMESTAMP
FROM   user_objects
WHERE  (object_name NOT LIKE 'SYS_%' AND object_name NOT LIKE 'CREATE$%' AND
       object_name NOT LIKE 'JAVA$%' AND object_name NOT LIKE 'LOADLOB%')
       AND object_type LIKE 'JAVA %'
ORDER  BY object_type, object_name;

當然也可以通過工具查看

轉自：http://blog.csdn.net/yzupope/article/details/7945308