package com.wow.lob;import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.net.URL;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;import org.junit.Test;import com.wow.util.JDBCUtil;/*
这个是创建的表
create table test2
(
id int primary key auto_increment,
image longblob
);
*/
public class Demo2 {
@Test
public static void insert() throws Exception{
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
try{
conn = JDBCUtil.getConection();
String sql = "insert into test2(image) values(?)";
ps = conn.prepareStatement(sql);
URL url = Demo2.class.getClassLoader().getResource("1.jpg");
File file = new File(url.getPath());
ps.setBinaryStream(1, new FileInputStream(file), file.length());
int num = ps.executeUpdate();
if(num>0){
System.out.println("插入成功");
}
}finally{
JDBCUtil.myClose(rs, ps, conn);
}
}
}我想问下,为什么程序一执行到int num = ps.executeUpdate(); 就出异常,说我sql语句有问题。二进制数据这么插入没错吧?求大神!!!
String sql = "insert into test2(image) values(?)";
ps = conn.prepareStatement(sql);这里还没有获得你要插入的值呢
你的sql报的是什么错,打印下你的sql语句,看看插进去的是什么,或者打印下你获得的图片路径。
public void saveImage(String filePath){
try {
//读文件创建流
File file=new File(filePath);
long filesize=file.length();
int filelength=(int)filesize;
//blob数据类型用int,longblob用long,否则报错
FileInputStream in=new FileInputStream(file);
//存放流
String sql="insert into tb_image(img) values(?)";
PreparedStatement prst=conn.prepareStatement(sql);
prst.setBinaryStream(1, in, filelength);或prst.setBinaryStream(1,in,in.avaliable()); prst.executeUpdate();
} catch (SQLException e1) {
System.out.println("连接数据库有问题");
e1.printStackTrace();
} catch (IOException e) {
System.out.println("IO有问题");
e.printStackTrace();
}
File file = new File(url.getPath());=>
InputStream in = Demo2.class.getClassLoader().getResourceAsStream("1.jpg");
public class Test {
public static void main(String[] args) throws SQLException {
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
conn = JDBCUtil.getConection();
String sql = "insert into pic values(?,?,?)";
ps = conn.prepareStatement(sql);
File file = new File("c:/a.jpg");
FileInputStream fis = new FileInputStream("c:/a.jpg");
ps.setInt(1, 1);
ps.setString(2, "a.jpg");
ps.setBinaryStream(3, fis, (int)file.length());
int num = ps.executeUpdate();
if (num > 0) {
System.out.println("插入成功");
}else{
System.err.println("插入失败");
}
}catch (Exception e) {
e.printStackTrace();
} finally {[code=Java]
JDBCUtil.myClose(rs, ps, conn);
}
}
}
[/code]之前我的MySQL数据库是GBK,也是
int num = ps.executeUpdate();
报错如下:
用MySQL的配置工具MySQLInstanceConfig.exe ,将MySQL数据库编码改成 : utf8后。操作成功,截图如下:
|
character_set_connection
|
character_set_database
|
character_set_filesystem
|
character_set_results
|
character_set_server
|
character_set_system
|
character_sets_dir是设置哪个的编码?