二、如何更新你已经编写的java存储过程？
假如要往类OracleJavaProc里添加一个存储过程方法，如何开发？
正确的步骤应该是先dropjava, 改程序，再loadjava。
e.g.修改OracleJavaProc类内容如下：
[复制此代码]CODE:
import java.sql.*;
import oracle.jdbc.*;
public class OracleJavaProc ...{
// Add a salgrade to the database.
public static void addSalGrade(int grade, int losal, int hisal) ...{
System.out.println("Creating new salgrade for EMPLOYEE...");
try ...{
Connection conn =
DriverManager.getConnection("jdbc:default:connection:");
String sql =
"INSERT INTO salgrade " +
"(GRADE,LOSAL,HISAL) " +
"VALUES(?,?,?)";
PreparedStatement pstmt = conn.prepareStatement(sql);
pstmt.setInt(1,grade);
pstmt.setInt(2,losal);
pstmt.setInt(3,hisal);
pstmt.executeUpdate();
pstmt.close();
}
catch(SQLException e) ...{
System.err.println("ERROR! Adding Salgrade: "
+ e.getMessage());
}
}
public static int getHiSal(int grade)
...{
try ...{
Connection conn =
DriverManager.getConnection("jdbc:default:connection:");
String sql = "SELECT hisal FROM salgrade WHERE grade = ?";
PreparedStatement pstmt = conn.prepareStatement(sql);pstmt.setInt(1, grade);
ResultSet rset = pstmt.executeQuery();
int res = 0;
if (rset.next())
...{
res = rset.getInt(1);
}
rset.close();
return res;
}
catch (SQLException e)
...{
System.err.println("ERROR! Querying Salgrade: "
+ e.getMessage());
return -1;
}
}
}
如何更新呢？
D:eclipse3.1workspacedbtest>dropjava -u scott -v OracleJavaProc
D:/tiger@iihero.oracledbeclipse3.1workspacedbtest>loadjava -u scott -v -resolve Or
acleJavaProc/tiger@iihero.oracledb.java
arguments: '-u' 'scott/tiger@iihero.oracledb' '-v' '-resolve' 'OracleJavaProc.java'
creating : source OracleJavaProc
loading : source OracleJavaProc
resolving: source OracleJavaProc
后边的应用示例：
[复制此代码]CODE:
SQL> create or replace function query_hisal(grade number) return number as langu
age java name 'OracleJavaProc.getHiSal(int) return int';
2 /
函数已创建。
SQL> set serveroutput on size 2000
SQL> call dbms_java.set_output(2000);
调用完成。
SQL> select query_hisal(5) from dual;
QUERY_HISAL(5)
--------------
9999
用法个人见解：不要手动drop java source, 不要手动drop procedure。
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