我有一個類,它通過JDBC與數據庫一起工作。連接到數據庫像往常一樣建立:Oracle:Java存儲函數:使用數據庫
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);
}
現在我必須使Oracle存儲函數,與數據庫的工作。是否有任何不同的方式來處理數據庫(例如,通過使用某種上下文建立連接)?對我來說,建立從功能內的URL,這是存儲在同一個DB =)
UPD似乎有點愚蠢:我有maven項目編譯在罐子裏。我的班級:
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/[email protected]: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();
}
}
接下來,使用loadjava上傳在DB是罐子IM:
loadjava -resolve -v -user user/[email protected]:1521/ae C:\Exchange\TestJavaToOracleProject.jar
然後我試圖創建PL/SQL包裝:
create or replace
function getUserObjectInfoById(obj_id IN NUMBER) return VARCHAR2
as language java
name 'testjavatooracleproject.App.selectJavaObjectById(long) return java.lang.String';
然後我試圖撥打我的功能:
select getUserObjectInfoById(400094) from dual;
但我發現了錯誤:
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:問題就解決了。解決方法對我來說:使用下面的代碼創建連接:
OracleDriver ora = new OracleDriver();
Conenction conn = ora.defaultConenction();
你的問題是什麼? –
@a_horse_with_no_name,我的問題是「如何使用數據庫從Java函數,存儲在相同的數據庫?」。 –
你是什麼意思「從數據庫從Java函數」?您是否需要關於如何通過JDBC使用語句來處理數據庫的教程?一個Oracle存儲函數已經「在使用數據庫」,它使用的是PL/SQL。 –