IT忍者神龟之Oracle PL/SQL 调用Java Source

JAVA Source

有的时候，我们需要在Oracle的Prodedure、Function中调用JAVA代码来实现功能，比方说下面的这个例子，调用JAVA代码来实现大小写金额的转换，如果这个代码用PL实现，难度还是有的，那如果我们先写成JAVA代码，然后通过调用，来实现，还是可以的。

创建

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--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;

/*

* 人民币大小写金额转化

*/

public class XhgUtil {

private static final String UNIT = "万千佰拾亿千佰拾万千佰拾元角分";

private static final String DIGIT = "零壹贰叁肆伍陆柒捌玖";

private static final double MAX_VALUE = 9999999999999.99D;

public static String trans(double v) {

if (v < 0 || v > MAX_VALUE)

return "参数非法!";

long l = Math.round(v * 100);//round(double a):返回最接近参数的long(返回值为static long)

if (l == 0)

return "零元整";

String strValue = l + "";

// j用来控制单位

int j = UNIT.length() - strValue.length();

String rs = "";

boolean isZero = false;

// i用来控制数

for (int i = 0; i < strValue.length(); i++, j++) {

char ch = strValue.charAt(i);

if (ch == '0') {

isZero = true;

if (UNIT.charAt(j) == '亿' || UNIT.charAt(j) == '万'

|| 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("亿万", "亿");

return rs;

}

}

创建引用

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CREATE OR REPLACE FUNCTION xchg(v NUMBER) RETURN VARCHAR2

AS

LANGUAGE JAVA NAME com.yzupope.util.XhgUtil.trans(double)return java.lang.String';

函数调用

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select xchg(105.91) FROM dual;

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

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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;

当然也可以通过工具查看