Navicat工具可以很好的查看Blob中的文本数据，可视对于二进制数据，没有办法查看，我希望有一个工具可以简单的读取和写入数据库中的BLOB字段进行一些测试工作，我简单的用java实现了这个小工具，下文贴出工具类的源码（超级简单），如果只是解决工作中修改BLOG字段，那么直接下载工具就可以了，希望对您有帮助。觉得好用，或者有问题，请留言，谢谢。
MySQLBlobTools工具下载地址
工具简要介绍
一个简单的java实现的命令行工具，可以对单条记录的Blob二进制数据与文件的交互操作。还可以通过脚本实现批量处理。工具简单实现方法：
java -jar MySQLBlobTools.jar -u -d "jdbc:mysql://localhost:3306/test?user=root&pass
Word=test&useUnicode=true" -f "./DVP-12SA/DVP-12SA.z
ip" -s "update
PRotconfig set protocol_content =? where id=?" -i 5
参数说明如下：
-r 从记录中读Blob数据并写入文件(-f参数)
-u 用文件内容更新数据库中的Blob字段
-w 插入一条Blob记录
-f 需要读/写的文件名
-d 数据库连接串，需要指定用户名和密码信息
-s SQL语句，更新需要指定两个参数，第一个参数为内容，第二个参数为操作的记录条件，读和插入只需一个参数
-i 操作记录的ID信息，读和更新需要指定
代码
代码共两个文件，需要mysql的驱动jar包。
命令行参数解析
参见Java GetOpt类
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
/**
* MySQL Blob tools
* @author yinhaibo
* @since 2017
* @version 1.00
*/
public class MySQLBlobTools {
private static String VERSION = "0.0.1";
private final static int MODE_INVALID = -1;
private final static int MODE_READ = 0;
private final static int MODE_WRITE = 1;
private final static int MODE_UPDATE = 2;
public static void main(String[] args){
String DBUrl = null;
String File = null;
String SQL = null;
String Id = null;
int mode = MODE_INVALID;
GetOpt getopt = new GetOpt(args, "hvrwuf:s:i:d:");
int c;
while((c = getopt.getNextOption()) != -1){
switch(c){
case 'h':
printHelpMessage();
System.exit(0);
case 'v':
printVersionMessage();
System.exit(0);
case 'r':
case 'w':
case 'u':
if (mode != MODE_INVALID){
printHelpMessage();
System.out.println();
System.out.println("Only a mode parameter can specified. r = read, w = write, u = update.");
System.exit(0);
}
if (c == 'r'){
mode = MODE_READ;
}else if(c == 'w'){
mode = MODE_WRITE;
}else if(c == 'u'){
mode = MODE_UPDATE;
}
break;
case 'f':
File = getopt.getOptionArg();
break;
case 's':
SQL = getopt.getOptionArg();
break;
case 'i':
Id = getopt.getOptionArg();
break;
case 'd':
DBUrl = getopt.getOptionArg();
break;
default:
printHelpMessage();
System.exit(0);
}
}
if (File == null || DBUrl == null || SQL == null){
printHelpMessage();
System.out.println();
System.out.println("Need -f, -d -s parameter specified.");
System.exit(0);
}
int rv = 0;
switch(mode){
case MODE_READ:
rv = readBlob(File, DBUrl, SQL, Id);
break;
case MODE_WRITE:
rv = writeBlob(File, DBUrl, SQL);
break;
case MODE_UPDATE:
rv = updateBlob(File, DBUrl, SQL, Id);
break;
}
System.exit(rv);
}
private static int updateBlob(String filename, String dBUrl, String SQL, String id) {
FileInputStream fis = null;
Connection conn = null;
PreparedStatement pstmt = null;
try {
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
conn = DriverManager.getConnection(dBUrl);
File file = new File(filename);
fis = new FileInputStream(file);
pstmt = conn.prepareStatement(SQL);
// //这种方法原理上会丢数据，因为file.length()返回的是long型
pstmt.setBinaryStream(1, fis, fis.available()); // 第二个参数为文件的内容
pstmt.setInt(2, Integer.parseInt(id));
pstmt.executeUpdate();
System.out.println("Success to write a blob data.");
return 1;
} catch (Exception ex) {
System.out.println("[blobInsert error : ]" + ex.toString());
} finally {
// 关闭所打开的对像//
try {
pstmt.close();
fis.close();
conn.close();
} catch (IOException e) {
} catch (SQLException e) {
}
}
return 0;
}
private static int writeBlob(String filename, String dBUrl, String SQL) {
FileInputStream fis = null;
Connection conn = null;
PreparedStatement pstmt = null;
try {
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
conn = DriverManager.getConnection(dBUrl);
File file = new File(filename);
fis = new FileInputStream(file);
pstmt = conn.prepareStatement(SQL);
// //这种方法原理上会丢数据，因为file.length()返回的是long型
pstmt.setBinaryStream(1, fis, fis.available()); // 第二个参数为文件的内容
pstmt.executeUpdate();
pstmt.close();
pstmt = conn.prepareStatement("SELECT LAST_INSERT_ID()");
ResultSet rs = pstmt.executeQuery();
rs.next();
rs.close();
pstmt.close();
System.out.println("Success to insert a blob record.");
return rs.getInt(1);
} catch (Exception ex) {
System.out.println("[blobInsert error : ]" + ex.toString());
} finally {
// 关闭所打开的对像//
try {
pstmt.close();
fis.close();
conn.close();
} catch (IOException e) {
} catch (SQLException e) {
}
}
return 0;
}
private static int readBlob(String filename, String dBUrl, String SQL, String id) {
Connection conn = null;
PreparedStatement pstmt = null;
byte[] Buffer = new byte[4096];
try {
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
conn = DriverManager.getConnection(dBUrl);
pstmt = conn.prepareStatement(SQL);
// //这种方法原理上会丢数据，因为file.length()返回的是long型
pstmt.setInt(1, Integer.parseInt(id));
ResultSet rs = pstmt.executeQuery();
rs.next();
File file = new File(filename);
if (!file.exists()) {
file.createNewFile(); // 如果文件不存在，则创建
}
FileOutputStream fos = new FileOutputStream(file);
InputStream is = rs.getBinaryStream(1);
int size = 0;
long totalLen = 0;
while ((size = is.read(Buffer)) != -1) {
totalLen += size;
fos.write(Buffer, 0, size);
}
fos.close();
System.out.println("Read blob data success, total length:" + totalLen);
return 1;
} catch (Exception ex) {
System.out.println("Read blob data error : ]" + ex.toString());
} finally {
// 关闭所打开的对像//
try {
pstmt.close();
conn.close();
} catch (SQLException e) {
}
}
return 0;
}
private static void printVersionMessage() {
System.out.println("MySQLBlobTools was make to
Operate blob field in mysql database. The tools just can process only a record.");
System.out.println("Author: yinhaibo Email:
[email protected]");
System.out.println("Version: " + VERSION);
}
private static void printHelpMessage() {
printVersionMessage();
System.out.println("-r read mode, need d, f, s, i parameters");
System.out.println("-w write mode, need d, f, s, i parameters");
System.out.println("-u update mode, need d, f, s, i parameters");
System.out.println("-d <MySQL URI> MySQL database uri, jdbc:mysql://localhost:3306/user?user=root&password=12345678");
System.out.println("-f <Filename> file for reading or writing");
System.out.println("-s <Operate SQL>, select blob from images where id=?, ? for i paramter");
System.out.println("-i <Record Id>");
System.out.println("For example:");
System.out.println("java MySQBlobTools.jar -r -f Blob.png -s \"select blob from images where id = ?\" -i 123");
System.out.println("java MySQBlobTools.jar -w -f Blob.png -s \"insert into images (blob) values(?) \"");
System.out.println("java MySQBlobTools.jar -u -f Blob.png -s \"update images set blob=? where id=?\" -i 123");
}
}
