Oracle:Java存储函数:使用数据库
我有一个类,它通过JDBC与数据库一起工作。与数据库的连接正常建立:Oracle:Java存储函数:使用数据库,java,oracle,jdbc,stored-functions,Java,Oracle,Jdbc,Stored Functions,我有一个类,它通过JDBC与数据库一起工作。与数据库的连接正常建立: Connection conn = null; try { DriverManager.registerDriver(new oracle.jdbc.OracleDriver()); conn = DriverManager.getConnection(DS_URL); } catch (SQLException ex) { logger.debug("C
Connection conn = null;
try {
DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
conn = DriverManager.getConnection(DS_URL);
} catch (SQLException ex) {
logger.debug("Cannot register driver for Oracle DB", ex);
}
现在我必须使Oracle存储功能与数据库一起工作。使用DB是否有不同的方法(例如,通过使用某些上下文建立连接)?在我看来,从函数中通过URL建立连接似乎有点愚蠢,因为它存储在同一个DB=)
UPD:我有一个在jar中编译的maven项目。我的班级是:
package testjavatooracleproject;
import java.sql.*;
public class App
{
public static void main(String[] args) throws SQLException{
System.out.println(selectJavaObjectById(400094));
}
public static String selectJavaObjectById(long id) throws SQLException
{
DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:user/password@localhost:1521:ae");
PreparedStatement ps = conn.prepareStatement("select * from user_objects where object_id = ?");
ps.setLong(1, id);
ResultSet rs = ps.executeQuery();
int columnCount = rs.getMetaData().getColumnCount();
StringBuilder sb = new StringBuilder();
if (rs.next()){
for(int i = 1; i <= columnCount; i++){
sb.append(rs.getObject(i));
}
}
conn.close();
return sb.toString();
}
}
然后我尝试创建PL/SQL包装器:
create or replace
function getUserObjectInfoById(obj_id IN NUMBER) return VARCHAR2
as language java
name 'testjavatooracleproject.App.selectJavaObjectById(long) return java.lang.String';
然后我尝试调用我的函数:
select getUserObjectInfoById(400094) from dual;
但我得到了一个错误:
ORA-29532: Java call terminated by uncaught Java exception: java.security.AccessControlException: the Permission (java.net.SocketPermission localhost:1521 connect,resolve) has not been granted to user. The PL/SQL to grant this is dbms_java.grant_permission( 'user', 'SYS:java.net.SocketPermission', 'localhost:1521', 'connect,resolve' )
29532. 00000 - "Java call terminated by uncaught Java exception: %s"
*Cause: A Java exception or error was signaled and could not be
resolved by the Java code.
*Action: Modify Java code, if this behavior is not intended.
UPD:问题已解决。我的解决方案:使用以下代码创建连接:
OracleDriver ora = new OracleDriver();
Conenction conn = ora.defaultConenction();
基本上有三种方法来登记和装载驾驶员
1. Class.forName(oracle.jdbc.driver.OracleDriver());
Connection con = DriverManager.getConnection(DS_URL);
2.System.setProperty("jdbc.drivers","sun.jdbc.odbc.JdbcOdbcDriver");
3. as mention by you
据我所知,你所犯的错误是因为你没有得到许可
exec dbms_java.grant_permission( 'user', 'SYS:java.net.SocketPermission',
'localhost:1521', 'connect,resolve' );
你的问题是什么?@a_horse_,没有名字,我的问题是“如何使用存储在同一数据库中的java函数中的db?”。你所说的“使用java函数中的db”是什么意思?您需要一个关于如何通过JDBC使用语句处理数据库的教程吗?一个Oracle存储函数已经在“使用DB”,它正在使用PL/SQL来实现这一点。
exec dbms_java.grant_permission( 'user', 'SYS:java.net.SocketPermission',
'localhost:1521', 'connect,resolve' );