JAVA操作Oracle blob类型

java 代码
package test;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.PrintStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class Test {
private Connection conn;
/**
* 得到一个数据库的连接
*
* @return 返加Connection对象
*/
public Connection getConnection() {
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
conn = DriverManager.getConnection(
"jdbc:oracle:thin:@localhost:1521:lyx", "scott", "tiger");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return conn;
}
/**
* 向表中插入图片
*
* @param path图片所在的路径
* @return 整形 判断成功或失败
*/
public int insertImage(String path) throws Exception {
int i = 0;
Statement st = null;
ResultSet rs = null;
conn=this.getConnection();
conn.setAutoCommit(false);//设置数据库为不自动提交,必须的一步
st = conn.createStatement();
//先插入一个空对象,这里我调用了Empty_BLOB()函数
i = st.executeUpdate("insert into image (id,image) values (seq1.nextval,Empty_BLOB())");
//以行的方式锁定
rs = st.executeQuery("select image from image where id=(select max(id) from image) for update");
if (rs.next()) {
//得到流
oracle.sql.BLOB blob = (oracle.sql.BLOB) rs.getBlob(1);
//从得到的低级流构造一个高级流
PrintStream ps = new PrintStream(blob.getBinaryOutputStream());
BufferedInputStream bis = new BufferedInputStream(
new FileInputStream(path));
byte[] buff = new byte[1024];
int n = 0;
//从输入到输出
while ((n = bis.read(buff)) != -1) {
ps.write(buff, 0, n);
}
//清空流的缓存
ps.flush();
//关闭流,注意一定要关
ps.close();
bis.close();
}
rs.close();
st.close();
conn.close();
return i;
}
public static void main(String[] args) throws Exception {
Test test=new Test();
test.insertImage("e:\\3.jpg");
System.out.println("OK");
}
}


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