如何將BLOB數組傳遞給存儲的oracle過程？

Question

我允許用戶將多個文件上傳到我的數據庫。 這些文件內容必須作為BLOB存儲在我的oracle數據庫中。

我如何編寫一個oracle過程來做到這一點？ （我對Oracle存儲過程有一點了解）？

完成此操作后，如何使用jdbc的CallableStatement在Java中使用存儲過程？

請幫忙。

Answer 1

首先，您必須創建將包含BLOB表的類型：

CREATE OR REPLACE TYPE tab_blobs AS TABLE OF BLOB;

在Java中，您必須依靠Oracle sql提供的STRUCT類型。 您將創建一個STRUCT，其中包含要存儲到數據庫中的BLOB數組。

該代碼如下所示：

import java.sql.Connection;
import java.sql.SQLException;

import oracle.jdbc.driver.OracleDriver;
import oracle.sql.ARRAY;
import oracle.sql.ArrayDescriptor;
import oracle.sql.STRUCT;
import oracle.sql.StructDescriptor;

public class ArrayDemo
{

    public static void passArray()
        throws SQLException
    {
        Connection conn = new OracleDriver().defaultConnection();

        byte[] fileInByteArray = "value".getBytes();
        StructDescriptor itemDescriptor = StructDescriptor.createDescriptor("BLOB", conn);

        Object[] itemAtributes = new Object[] {};
        STRUCT itemObject1 = new STRUCT(itemDescriptor, conn, itemAtributes);

        itemAtributes = new Object[] {};
        STRUCT itemObject2 = new STRUCT(itemDescriptor, conn, itemAtributes);

        STRUCT[] idsArray = { itemObject1, itemObject2 };

        ArrayDescriptor descriptor = ArrayDescriptor.createDescriptor("IDS_TABLE", conn);

        ARRAY array_to_pass = new ARRAY(descriptor, conn, idsArray);

        OraclePreparedStatement ps = (OraclePreparedStatement) conn.prepareStatement("begin getInfo(:x); end;");

        ps.setARRAY(1, array_to_pass);
        ps.execute();

    }
}

但是為什么不通過遍歷文件，一個接一個地插入它們來簡化處理：

public static void insererBlob(String name, String path) {
   File file = new File(path);
   try{
      //link to DB
      Connection connection = DriverManager.getConnection("url","user","password");

      //link to file
      FileInputStream stream = new FileInputStream(file);

      //prepare the SQL instruction
      String sql = "INSERT INTO file_table VALUES (?, ?)";
      PreparedStatement statement = connection.prepareStatement(sql);

      //blob insertion
      statement.setString(1, name);
      statement.setBinaryStream(2, stream, (int)file.length());
      statement.executeUpdate();

    }catch(Exception e){
       //ERROR SQL, IO, etc .
    }finally {
       //close connection ?
    }
}

Answer 2

詳細信息可以在此鏈接上找到， 使用Oracle數據庫進行文件的裝卸

Answer 3

這是另一種嘗試來幫助您。 您可以在此處從oracle找到更多信息： http : //docs.oracle.com/cd/B28359_01/java.111/e10788/connect.htm#CHDGHFCG http://docs.oracle.com/javase/tutorial/jdbc/基本/

另外，示例取自（我不得不這樣做的時候在我的網站上提供了很大幫助）： http : //docs.oracle.com/javase/tutorial/jdbc/basics/blob.html

public void addRowToCoffeeDescriptions(
    String coffeeName, String fileName)
    throws SQLException {

    PreparedStatement pstmt = null;
    try {
        Clob myClob = this.con.createClob();
        Writer clobWriter = myClob.setCharacterStream(1);
        String str = this.readFile(fileName, clobWriter);
        System.out.println("Wrote the following: " +
            clobWriter.toString());

        if (this.settings.dbms.equals("mysql")) {
            System.out.println(
                "MySQL, setting String in Clob " +
                "object with setString method");
            myClob.setString(1, str);
        }
        System.out.println("Length of Clob: " + myClob.length());

        String sql = "INSERT INTO COFFEE_DESCRIPTIONS " +
                     "VALUES(?,?)";

        pstmt = this.con.prepareStatement(sql);
        pstmt.setString(1, coffeeName);
        pstmt.setClob(2, myClob);
        pstmt.executeUpdate();
    } catch (SQLException sqlex) {
        JDBCTutorialUtilities.printSQLException(sqlex);
    } catch (Exception ex) {
      System.out.println("Unexpected exception: " + ex.toString());
    } finally {
        if (pstmt != null)pstmt.close();
    }
}

Answer 4

以下是我的代碼，希望您能得到答案：

1. 從Java代碼：

     try {Class.forName("oracle.jdbc.driver.OracleDriver"); String url = "jdbc:oracle:thin:@localhost:1521:orcl"; Connection con = DriverManager.getConnection(url, db_user, password); System.out.println("Connected to database"); SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd/MM/yyyy"); Date now = new java.sql.Date(simpleDateFormat.parse("12/02/2001").getTime()); String command2 = "{call USER1(?,?,?,?)}"; String path; File[] roots = File.listRoots(); path=roots[0].getPath()+"dfg.jpg"; System.out.println("path: " + path); //shows drives in you computer for(int i = 0; i < roots.length ; i++){ System.out.println("drive: " + roots[i].getPath()); } CallableStatement insertStatment = con.prepareCall(command2); insertStatment.setInt(1, 18); insertStatment.setString(2, "ankssaait"); insertStatment.setDate(3, now); File file = new File(path); //link to file FileInputStream stream = new FileInputStream(file); insertStatment.setBinaryStream(4, stream,(int)file.length());; System.out.println("onExecute: "+ insertStatment.executeUpdate()); insertStatment.close(); System.out.println("done"); } catch (Exception e) { e.printStackTrace(); } 

2. 我的桌子是：

   創建表“ ANKIT”。“ O_USER”（“名稱” VARCHAR2（20 BYTE），“ GENDER” CHAR（1 BYTE），“ DESIGNTION” VARCHAR2（20 BYTE），“ YEAR”間隔年（2）到MONTH，“ ID “ NUMBER NOT NULL ENABLE，” DOB“日期，” PROOF“ CLOB，” ADDRESS“ VARCHAR2（100 BYTE），” TELEPHONE“ NUMBER，” RAW1“ RAW（20），” IMAGE“ BLOB，CONSTRAINT” O_USER_PK“主鍵（ “ID”））;

3. 我的程序是：

    CREATE OR REPLACE PROCEDURE USER1 (U_ID IN o_user.id%TYPE, U_NAME in o_user.name%TYPE, u_DOB in o_user.dob%TYPE, u_image in o_user.image%TYPE) AS BEGIN insert into o_user(id,name,dob,image) values(u_id,u_name,u_dob,u_image); END USER1;