当前位置:Gxlcms >
数据库问题 >
json代码驾照考题批量加入MySQL数据库 ps.executeUpdate()永远只能悲催的加一条数据 去掉id主键自增 for 与 foreach
json代码驾照考题批量加入MySQL数据库 ps.executeUpdate()永远只能悲催的加一条数据 去掉id主键自增 for 与 foreach
时间:2021-07-01 10:21:17
帮助过:15人阅读
com.swift;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.List;
import com.google.gson.Gson;
public class AddAll {
/**
* 将D盘D:\java_JDK\java_date路径下的jzkt.json文件中的json驾照考试代码用Gson解析成root对象
*/
public static void main(String[] args) {
File file =
new File("D:\\java_JDK\\java_date", "jzkt.json"
);
StringBuilder sb =
null;
List<Result> list =
null;
try {
BufferedReader br =
new BufferedReader(
new InputStreamReader(
new FileInputStream(file), "utf-8"
));
String str =
null;
sb =
new StringBuilder();
final String LINE_SEPARATOR = System.getProperty("line.separator"
);
try {
while ((str = br.readLine()) !=
null) {
sb.append(str);
sb.append(LINE_SEPARATOR);
}
Gson gson =
new Gson();
Root root = gson.fromJson(sb.toString(), Root.
class);
list = root.getResult();
//得到Result类型的对象列表集合
}
catch (IOException e) {
e.printStackTrace();
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
if (addAll(list)) {
System.out.println("添加成功"
);
} else {
System.out.println("添加失败"
);
}
}
private static boolean addAll(List<Result>
list) {
Connection conn =
JDBCUtil.getConn();
PreparedStatement ps =
null;
try {
ps = conn.prepareStatement("insert into sw_question values(?,?,?,?,?,?,?,?,?)"
);
for (
int i = 0; i < list.size(); i++) {
//不要用foreach的方法,查询可以修改不行
System.out.println("i=" +
i);
ps.setInt(1
, list.get(i).getId());
ps.setString(2
, list.get(i).getQuestion());
ps.setString(3
, list.get(i).getAnswer());
ps.setString(4
, list.get(i).getItem1());
ps.setString(5
, list.get(i).getItem2());
ps.setString(6
, list.get(i).getItem3());
ps.setString(7
, list.get(i).getItem4());
ps.setString(8
, list.get(i).getExpalins());
ps.setString(9
, list.get(i).getUrl());
ps.addBatch();//添加到批处理 ,使用ps.executeUpdate()永远只能悲催的加一条数据
}
ps.executeBatch();//执行批处理
return true;
} catch (SQLException e) {
e.printStackTrace();
} finally {
JDBCUtil.closeAll(conn, ps, null);
}
return false;
}
}
json代码驾照考题批量加入MySQL数据库 ps.executeUpdate()永远只能悲催的加一条数据 去掉id主键自增 for 与 foreach
标签:gson code fileinput finally bsp null url set else