案例1-导出Blob字段图像
需求:
有一张单表存储着图片(图片使用Blob字段)以及图片的相关信息,需求是从数据库中将这些Blob字段内容保存为图片文件,文件名为图片的相关信息。
环境
数据库:Oracle 本地:Windows 工具:Hutool-db模块
编码
数据库配置:src/main/resources/config/db.setting
# -------------------------------------------------------------
# ----- Setting File with UTF8-----
# ----- 数据库配置文件 -----
# -------------------------------------------------------------
#JDBC url,必须
url = jdbc:oracle:thin:@192.168.1.1:1521/orcl
#用户名,必须
user = test
#密码,必须,如果密码为空,请填写 pass =
pass = test
代码:PicTransfer.java
public class PicTransfer {
private static SqlRunner runner = SqlRunner.create();
private static String destDir = "f:/pic";
public static void main(String[] args) throws SQLException {
runner.find(
CollUtil.newArrayList("NAME", "TYPE", "GROUP", "PIC"),
Entity.create("PIC_INFO").set("TYPE", 1),
new RsHandler<String>(){
@Override
public String handle(ResultSet rs) throws SQLException {
while(rs.next()){
save(rs);
}
return null;
}
}
);
}
private static void save(ResultSet rs) throws SQLException{
String path = StrUtil.format("{}/{}-{}.jpg", destDir, rs.getString("NAME"), rs.getString("GROUP"));
FileUtil.writeFromStream(rs.getBlob("PIC").getBinaryStream(), path);
}
}