一、如何创建java存储过程?
通常有三种方法来创建java存储过程。
1. 使用oracle的sql语句来创建:
e.g. 使用create or replace and compile java source named "
后边跟上java源程序。要求类的方法必须是public static的,才能用于存储过程。
SQL> create or replace and compile java source named "javademo1"
2 as
3 import java.sql.*;
4 public class JavaDemo1
5 {
6 public static void main(String[] argv)
7 {
8 System.out.println("hello, java demo1");
9 }
10 }
11 /
Java 已创建。
SQL> show errors java source "javademo1"
没有错误。
SQL> create or replace procedure javademo1
2 as
3 language java name ''JavaDemo1.main(java.lang.String[])'';
4 /
过程已创建。
SQL> set serveroutput on
SQL> call javademo1();
调用完成。
SQL> call dbms_java.set_output(5000);
调用完成。
SQL> call javademo1();
hello, java demo1
调用完成。
SQL> call javademo1();
hello, java demo1
调用完成。
2. 使用外部class文件来装载创建
e.g. 这里既然用到了外部文件,必然要将class文件放到oracle Server的某一目录下边。
public class OracleJavaProc
{
public static void main(String[] argv)
{
System.out.println("It''s a Java Oracle procedure.");
}
}
SQL> grant create any directory to scott;
授权成功。
SQL> conn scott/[email protected]
已连接。
SQL> create or replace directory test_dir as ''d:/oracle'';
目录已创建。
SQL> create or replace java class using bfile(test_dir, ''OracleJavaProc.CLASS'')
2 /
Java 已创建。
SQL> create or replace procedure testjavaproc as language java name ''OracleJavaProc.main(java.lang.String[])'';
2 /
过程已创建。
SQL> call testjavaproc();
调用完成。
SQL> execute testjavaproc;
PL/SQL 过程已成功完成。
SQL> set serveroutput on size 5000
SQL> call dbms_java.set_output(5000);
调用完成。
SQL> execute testjavaproc;
It''s a Java Oracle procedure.
3. 我推荐的一种方法,直接使用loadjava命令远程装载并创建。
先创建一个类, e.g.
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());
}
}
}
使用loadjava命令将其装载到服务器端并编译:
D:eclipse3.1workspacedbtest>loadjava -u scott/[email protected] -v -resolve Or
acleJavaProc.java
arguments: ''-u'' ''scott/[email protected] ''-v'' ''-resolve'' ''OracleJavaProc.java''
creating : source OracleJavaProc
loading : source OracleJavaProc
resolving: source OracleJavaProc
查询一下状态:
连接到:
Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.1.0 - Production
SQL> SELECT object_name, object_type, status FROM user_objects WHERE object_type LIKE ''JAVA%'';
OBJECT_NAME
--------------------------------------------------------------------------------
OBJECT_TYPE STATUS
------------------------------------ --------------
OracleJavaProc
JAVA CLASS VALID
OracleJavaProc
JAVA SOURCE VALID
测试一下存储过程:
SQL> create or replace procedure add_salgrade(id number, losal number, hisal num
ber) as language java name ''OracleJavaProc.addSalGrade(int, int, int)'';
2 /
过程已创建。
SQL> set serveroutput on size 2000
SQL> call dbms_java.set_output(2000);
调用完成。
SQL> execute add_salgrade(6, 10000, 15000);
Creating new salgrade for EMPLOYEE...
PL/SQL 过程已成功完成。
SQL> select * from salgrade where grade=6;
GRADE LOSAL HISAL
---------- ---------- ----------
6 10000 15000
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:
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:/[email protected]>loadjava -u scott -v -resolve Or
acleJavaProc/[email protected]
arguments: ''-u'' ''scott/[email protected]'' ''-v'' ''-resolve'' ''OracleJavaProc.java''
creating : source OracleJavaProc
loading : source OracleJavaProc
resolving: source OracleJavaProc
后边的应用示例:
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
全文完!
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