MysqlUtils.java
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package com.lhcredit.business.functionApi.utils;
import com.alibaba.fastjson.JSONObject;
import java.sql.*;
import java.util.ArrayList;
import java.util.List;
/**
* MySQL工具类
*/
public class MysqlUtils {
private String url;
private String username;
private String password;
private String driverClassName = "com.mysql.cj.jdbc.Driver";
private Connection conn = null;
private PreparedStatement pstmt = null;
private ResultSet rs = null;
public static MysqlUtils ofZd(){
MysqlUtils mysqlUtils = new MysqlUtils();
mysqlUtils.init("103.110.132.64",63015,"ent_spider","root","Lianhe@123456");
return mysqlUtils;
}
/**
* 初始化MySQL连接参数
*
* @param host 主机地址
* @param port 端口号
* @param database 数据库名
* @param username 用户名
* @param password 密码
*/
public void init(String host, int port, String database, String username, String password) {
this.url = "jdbc:mysql://" + host + ":" + port + "/" + database + "?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=false&serverTimezone=GMT%2B8";
this.username = username;
this.password = password;
try {
this.conn = DriverManager.getConnection(url, username, password);
} catch (SQLException e) {
throw new RuntimeException(e);
}
try {
Class.forName(driverClassName);
} catch (ClassNotFoundException e) {
throw new RuntimeException("找不到MySQL驱动类: " + driverClassName, e);
}
}
/**
* 根据SQL语句查询List列表
*
* @param sql SQL查询语句
* @return 查询结果列表，每个元素是一个Map，key为列名，value为列值
*/
public List<JSONObject> queryList(String sql) {
return queryList(sql, new Object[0]);
}
/**
* 根据带参数的SQL语句查询List列表
*
* @param sql SQL查询语句
* @param params SQL参数
* @return 查询结果列表，每个元素是一个Map，key为列名，value为列值
*/
public List<JSONObject> queryList(String sql, Object... params) {
List<JSONObject> result = new ArrayList<>();
try {
pstmt = conn.prepareStatement(sql);
// 设置参数
if (params != null) {
for (int i = 0; i < params.length; i++) {
pstmt.setObject(i + 1, params[i]);
}
}
rs = pstmt.executeQuery();
// 获取结果集元数据
ResultSetMetaData metaData = rs.getMetaData();
int columnCount = metaData.getColumnCount();
// 遍历结果集
while (rs.next()) {
JSONObject row = new JSONObject();
for (int i = 1; i <= columnCount; i++) {
String columnName = metaData.getColumnLabel(i);
Object value = rs.getObject(i);
row.put(columnName, value);
}
result.add(row);
}
} catch (SQLException e) {
throw new RuntimeException("执行SQL查询出错: " + sql, e);
} finally {
// 关闭资源
// closeResource(rs, pstmt, conn);
}
return result;
}
/**
* 执行更新操作（INSERT、UPDATE、DELETE）
*
* @param sql SQL语句
* @param params SQL参数
* @return 影响的行数
*/
public int executeUpdate(String sql, Object... params) {
Connection conn = null;
PreparedStatement pstmt = null;
try {
conn = DriverManager.getConnection(url, username, password);
pstmt = conn.prepareStatement(sql);
// 设置参数
if (params != null) {
for (int i = 0; i < params.length; i++) {
pstmt.setObject(i + 1, params[i]);
}
}
return pstmt.executeUpdate();
} catch (SQLException e) {
throw new RuntimeException("执行SQL更新出错: " + sql, e);
} finally {
// 关闭资源
// closeResource(null, pstmt, conn);
}
}
/**
* 关闭数据库资源
*
*/
public void closeResource() {
if (this.rs != null) {
try {
this.rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (this.pstmt != null) {
try {
pstmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (this.conn != null) {
try {
this.conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}