logDAOimplement

最新推荐文章于 2025-05-02 11:18:51 发布

林钦声

最新推荐文章于 2025-05-02 11:18:51 发布

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分类专栏：课程设计文章标签： java 开发语言

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该代码段展示了如何使用Java的DBUtils工具类实现LogDao接口中的查询(queryLog)和添加(addLog)日志方法。通过建立SQL语句，连接数据库，预编译SQL并处理结果集，实现了对用户日志数据的CRUD操作。

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package dao.impl;

import bean.logs;
import dao.LogDao;
import dbutils.DBHelper;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

public class LogDaoImplement implements LogDao {
@Override
public List<logs> queryLog(String useId) {
if (useId == null) {
return null;
}
Connection conn = DBHelper.getConnection();
ResultSet rs = null;
String sql = "select * from logs WHERE userId ='" + useId + "';";
PreparedStatement stat = null;
List<logs> logsList = new ArrayList<>();
try {
stat = conn.prepareStatement(sql);
rs = stat.executeQuery();
while (rs.next()) {
logs logs = new logs();
logs.setUserId(rs.getString("userId"));
logs.setphoneNum(rs.getString("phoneNum"));
logs.setTimes(rs.getString("times"));
logs.setLogContext(rs.getString("LogContext"));
logsList.add(logs);
}
} catch (SQLException e) {
throw new RuntimeException(e);
} finally {
DBHelper.closeAll(conn, stat, rs);
}
if (logsList.isEmpty()) return null;
else return logsList;
}

@Override
public void addLog(logs log) {
Connection conn = DBHelper.getConnection();
String sql = "INSERT logs(userId,phoneNum,times,logContext) VALUE(?,?,?,?);";
PreparedStatement stat = null;
ResultSet rs = null;
try {
stat = conn.prepareStatement(sql);
stat.setString(1, log.getUserId());
stat.setString(2,log.getphoneNum());
stat.setString(3, log.getTimes());
stat.setString(4, log.getLogContext());
stat.executeUpdate();
} catch (SQLException e) {
throw new RuntimeException(e);
} finally {
DBHelper.closeAll(conn, stat, rs);
}
}

}