原生Java操作mysql数据库过程解析

<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
 <groupId>mysql</groupId>
 <artifactId>mysql-connector-java</artifactId>
 <version>6.0.6</version>
</dependency>

//文件名：DBUtil.java

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DBUtil {

 static String user = "root";
 static String password = "root";
 static String url = "jdbc:mysql://localhost【数据库地址】:3306【端口】/【数据库名称】?serverTimezone=UTC";

 static {
  try {
   Class.forName("com.mysql.cj.jdbc.Driver");
  } catch (ClassNotFoundException e) {
   e.printStackTrace();
  }
 }

 public static Connection getConnection() {
  Connection conn = null;
  try {
   conn = DriverManager.getConnection(url, user, password);
  } catch (SQLException e) {
   e.printStackTrace();
  }
  return conn;
 }

 public static void closeJDBC(ResultSet rs, Statement stmt, Connection conn) {
  if (rs != null) {
   try {
    rs.close();
   } catch (SQLException e) {
    e.printStackTrace();
   }
  }
  if (stmt != null) {
   try {
    stmt.close();
   } catch (SQLException e) {
    e.printStackTrace();
   }
  }
  if (conn != null) {
   try {
    conn.close();
   } catch (SQLException e) {
    e.printStackTrace();
   }
  }
 }
}

//查找table表重的 id和name
String sql = "select id,name from table";
Connection conn = DBUtil.getConnection();
PreparedStatement pstmt = null;
try {
  conn.setAutoCommit(false);
  pstmt = conn.prepareStatement(sql);
  ResultSet rs = pstmt.executeQuery();
  json = ResultSetToJson.ResultSetToJsonArray(rs);
  }catch (SQLException e){
  try {
   conn.rollback();
  }catch (SQLException e1){
   e1.printStackTrace();
  }
}finally {
 DBUtil.closeJDBC(null, pstmt, conn);
}
  return json;

int basicinfoID = 0;
String sql = "INSERT INTO tb_resume_basicinfo("
　　　　+ "basicinfo_id, realname, gender, birthday, current_loc, "
　　　　+ "resident_loc, telephone, email, job_intension, job_experience, head_shot,applicant_id) "
　　　　+"VALUES(SEQ_ITOFFER_RESUMEBASICINFO.NEXTVAL,?,?,?,?,?,?,?,?,?,?,?)";
Connection conn = DBUtil.getConnection();
PreparedStatement pstmt = null;
  try {
   // 关闭自动提交
   conn.setAutoCommit(false);
   pstmt = conn.prepareStatement(sql);
   pstmt.setString(1, basicinfo.getRealName());
   pstmt.setString(2, basicinfo.getGender());
   pstmt.setTimestamp(3, basicinfo.getBirthday() == null ? null
     : new Timestamp(basicinfo.getBirthday().getTime()));
   pstmt.setString(4, basicinfo.getCurrentLoc());
   pstmt.setString(5, basicinfo.getResidentLoc());
   pstmt.setString(6, basicinfo.getTelephone());
   pstmt.setString(7, basicinfo.getEmail());
   pstmt.setString(8, basicinfo.getJobIntension());
   pstmt.setString(9, basicinfo.getJobExperience());
   pstmt.setString(10, basicinfo.getHeadShot());
   pstmt.setInt(11, applicantID);
   pstmt.executeUpdate();
} catch (SQLException e) {
   try {
    // 事务回滚
    conn.rollback();
   } catch (SQLException e1) {
    e1.printStackTrace();
   }
   e.printStackTrace();
  } finally {
   DBUtil.closeJDBC(null, pstmt, conn);
  }