Java Scala實(shí)現(xiàn)數(shù)據(jù)庫增刪查改操作詳解

更新時(shí)間：2023年04月08日 09:52:44 作者：你∈我

這篇文章主要介紹了Java Scala實(shí)現(xiàn)數(shù)據(jù)庫增刪查改操作，文中通過示例代碼介紹的非常詳細(xì)，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值，需要的朋友們下面隨著小編來一起學(xué)習(xí)吧

添加jar包

這里的Scala不是maven工程所以要找到項(xiàng)目結(jié)構(gòu)（快捷鍵：同時(shí)按住Ctrl+shift+Alt+s）在模塊里面添加添加MySQL的jar包，如果是Maven工程可以直接在pom里面直接加即可

實(shí)現(xiàn)操作數(shù)據(jù)庫需要兩個(gè)類，一個(gè)用于測試的Demo，一個(gè)用于實(shí)現(xiàn)增刪查改的Util方法

在MysqlDemo在這里需要用到伴生類和伴生對象，伴生類主要是實(shí)現(xiàn)連接數(shù)據(jù)庫

class MysqlDemo {
  //  連接數(shù)據(jù)庫 底層原理還是jdbc
  //驅(qū)動(dòng)名稱
  var driver = "com.mysql.cj.jdbc.Driver"
  //  訪問MySQL服務(wù)器，通過3306端口訪問mysql數(shù)據(jù)庫
  var url = "jdbc:mysql://192.168.152.184:3306/exam"
  //用戶名
  var user = "root"
  //密碼
  var password = "123456"
  //輔助構(gòu)造器
  def this(driver: String, url: String, user: String, pwd: String) {
    this()
    this.driver = driver
    this.url = url
    this.user = user
    this.password = pwd
  }
}

伴生對象則主要是實(shí)現(xiàn)操作數(shù)據(jù)庫，需要先實(shí)現(xiàn)apply方法，主函數(shù)里面創(chuàng)建對象調(diào)用apply方法，調(diào)用連接方法和釋放資源

object MysqlDemo {
  //  實(shí)現(xiàn)apply方法
  def apply(): MysqlDemo = new MysqlDemo()
  def apply(driver: String, url: String, user: String, pwd: String): MysqlDemo = new MysqlDemo(driver, url, user, pwd)
  def main(args: Array[String]): Unit = {
    //創(chuàng)建對象，調(diào)用apply方法
    val demo = MysqlDemo()
    //導(dǎo)入MySQLUtil包
    import MysqlUtil._
    //調(diào)用創(chuàng)建連接的方法
    demo.conn()
    // 調(diào)用釋放資源方法
    demo.close(connection)
/**操作數(shù)據(jù)庫代碼*/
}

Util則需要先初始化數(shù)據(jù)庫連接，注冊驅(qū)動(dòng)，得到數(shù)據(jù)庫連接，釋放資源

import java.sql.{Connection, DriverManager, PreparedStatement, ResultSet}
object MysqlUtil {
  implicit class MysqlOp(obj: MysqlDemo) {
    //初始化數(shù)據(jù)連接
    private var connection: Connection = _
    def conn(): Connection = {
      //注冊driver
      Class.forName(obj.driver)
      //得到數(shù)據(jù)庫連接
      val connection: Connection = DriverManager.getConnection(obj.url, obj.user, obj.password)
      connection
    }
    //釋放資源
    def close(conn: Connection): Unit = {
      if (conn != null) {
        conn.close()
      }
    }
}

準(zhǔn)備工作已做完下面要實(shí)現(xiàn)對數(shù)據(jù)庫的增刪查改

添加數(shù)據(jù)

方法一

//Util代碼
//添加數(shù)據(jù)方法一
    def insertStudent: Int = {
      val insertSqlStr = "insert into student(name, age, gender, telephone, email, classid)" +
        "values ('周七', 6, '男', '13888888888', '346497@qq.com', 2)"
      val i: Int = conn().createStatement.executeUpdate(insertSqlStr)
      i
    }
//Demo測試代碼
 //添加數(shù)據(jù)方法一
    val i: Int = demo.insertStudent
    if (i == 1) {
      println("添加成功")
    } else if (i == 0) {
      println("添加失敗")
    }

方法二

//Util代碼  
   //添加數(shù)據(jù)方法二
    def insertStudent(name: String, age: Int, gender: String, telephone: String, email: String, classid: Int): Int = {
      val insertSqlStr = "insert into student(id,name, age, gender, telephone, email, classid)" +
        "values (null,?,?,?,?,?,?)"
      val preStmt: PreparedStatement = conn().prepareStatement(insertSqlStr)
      preStmt.setString(1, name)
      preStmt.setInt(2, age)
      preStmt.setString(3, gender)
      preStmt.setString(4, telephone)
      preStmt.setString(5, email)
      preStmt.setInt(6, classid)
      val i: Int = preStmt.executeUpdate()
      i
    }
//Demo測試代碼
 //添加數(shù)據(jù)方法二
    val i: Int = demo.insertStudent("aaa", 18, "男", "12345678910", "34649756@qq.com", 1)
    if (i == 1) {
      println("添加成功")
    } else if (i == 0) {
      println("添加失敗")
    }

刪除數(shù)據(jù)

//Util代碼
  def deleteStudent(id: Int): Int = {
      val deleteSql = "delete from student where id= ?"
      val preStmt: PreparedStatement = conn().prepareStatement(deleteSql)
      preStmt.setInt(1, id)
      val i: Int = preStmt.executeUpdate()
      i
    }
//Demo測試代碼
        val i: Int = demo.deleteStudent(21)
        if (i == 1) {
          println("刪除成功")
        } else if (i == 0) {
          println("刪除失敗")
        }

查詢數(shù)據(jù)

//Util代碼
   def selectStudent: Unit = {
      val selectSql = "select id,name, age, gender, telephone, email, classid from student"
      val rs: ResultSet = conn().createStatement().executeQuery(selectSql)
      println("學(xué)號(hào)\t姓名\t年齡\t性別\t手機(jī)號(hào)\t郵箱\t班級編號(hào)")
      while (rs.next()) {
        val id: Int = rs.getInt("id")
        val name: String = rs.getString("name")
        val age: Int = rs.getInt("age")
        val gender: String = rs.getString("gender")
        val telephone: String = rs.getString("telephone")
        val email: String = rs.getString("email")
        val classid: String = rs.getString("classid")
        println(id + "\t" + name + "\t" + age + "\t" + gender + "\t" + telephone + "\t" + email + "\t" + classid)
      }
    }
//Demo測試代碼
        demo.selectStudent

修改數(shù)據(jù)

//Util代碼
   def updateStudent(id: Int, name: String, age: Int, gender: String, telephone: String, email: String, classid: Int): Int = {
      val updateSql = "update student set name=?," + "age=?, " + "gender=?," +
        "telephone=?," + "email=?, " + "classid=? where id=?"
      val preStmt: PreparedStatement = conn().prepareStatement(updateSql)
      preStmt.setString(1, name)
      preStmt.setInt(2, age)
      preStmt.setString(3, gender)
      preStmt.setString(4, telephone)
      preStmt.setString(5, email)
      preStmt.setInt(6, classid)
      preStmt.setInt(7, id)
      val i: Int = preStmt.executeUpdate()
      i
    }
//Demo測試代碼
        val i: Int = demo.updateStudent(22, "test", 25, "女", "123456789", "369852@qq.com", 2)
        if (i == 1) {
          println("修改成功")
        } else if (i == 0) {
          println("修改失敗")
        }

完整代碼

MysqlUtil代碼

import java.sql.{Connection, DriverManager, PreparedStatement, ResultSet}
object MysqlUtil {
  implicit class MysqlOp(obj: MysqlDemo) {
    //初始化數(shù)據(jù)連接
    private var connection: Connection = _
    def conn(): Connection = {
      //注冊driver
      Class.forName(obj.driver)
      //得到數(shù)據(jù)庫連接
      val connection: Connection = DriverManager.getConnection(obj.url, obj.user, obj.password)
      connection
    }
    //釋放資源
    def close(conn: Connection): Unit = {
      if (conn != null) {
        conn.close()
      }
    }
    //添加數(shù)據(jù)方法一
    def insertStudent: Int = {
      val insertSqlStr = "insert into student(name, age, gender, telephone, email, classid)" +
        "values ('bbb', 6, '男', '13852277346', '3464975236@qq.com', 2)"
      val i: Int = conn().createStatement.executeUpdate(insertSqlStr)
      i
    }
    //添加數(shù)據(jù)方法二
    def insertStudent(name: String, age: Int, gender: String, telephone: String, email: String, classid: Int): Int = {
      val insertSqlStr = "insert into student(id,name, age, gender, telephone, email, classid)" +
        "values (null,?,?,?,?,?,?)"
      val preStmt: PreparedStatement = conn().prepareStatement(insertSqlStr)
      preStmt.setString(1, name)
      preStmt.setInt(2, age)
      preStmt.setString(3, gender)
      preStmt.setString(4, telephone)
      preStmt.setString(5, email)
      preStmt.setInt(6, classid)
      val i: Int = preStmt.executeUpdate()
      i
    }
    //刪除數(shù)據(jù)
    def deleteStudent(id: Int): Int = {
      val deleteSql = "delete from student where id= ?"
      val preStmt: PreparedStatement = conn().prepareStatement(deleteSql)
      preStmt.setInt(1, id)
      val i: Int = preStmt.executeUpdate()
      i
    }
    //修改數(shù)據(jù)
    def updateStudent(id: Int, name: String, age: Int, gender: String, telephone: String, email: String, classid: Int): Int = {
      val updateSql = "update student set name=?," + "age=?, " + "gender=?," +
        "telephone=?," + "email=?, " + "classid=? where id=?"
      val preStmt: PreparedStatement = conn().prepareStatement(updateSql)
      preStmt.setString(1, name)
      preStmt.setInt(2, age)
      preStmt.setString(3, gender)
      preStmt.setString(4, telephone)
      preStmt.setString(5, email)
      preStmt.setInt(6, classid)
      preStmt.setInt(7, id)
      val i: Int = preStmt.executeUpdate()
      i
    }
    //查詢數(shù)據(jù)
    def selectStudent: Unit = {
      val selectSql = "select id,name, age, gender, telephone, email, classid from student"
      val rs: ResultSet = conn().createStatement().executeQuery(selectSql)
      println("學(xué)號(hào)\t姓名\t年齡\t性別\t手機(jī)號(hào)\t郵箱\t班級編號(hào)")
      while (rs.next()) {
        val id: Int = rs.getInt("id")
        val name: String = rs.getString("name")
        val age: Int = rs.getInt("age")
        val gender: String = rs.getString("gender")
        val telephone: String = rs.getString("telephone")
        val email: String = rs.getString("email")
        val classid: String = rs.getString("classid")
        println(id + "\t" + name + "\t" + age + "\t" + gender + "\t" + telephone + "\t" + email + "\t" + classid)
      }
    }
  }
}

MysqlDemo代碼

import java.sql.Connection
class MysqlDemo {
  //  連接數(shù)據(jù)庫 底層原理還是jdbc
  //驅(qū)動(dòng)名稱
  var driver = "com.mysql.cj.jdbc.Driver"
  //  訪問MySQL服務(wù)器，通過3306端口訪問mysql數(shù)據(jù)庫
  var url = "jdbc:mysql://192.168.152.184:3306/exam"
  //用戶名
  var user = "root"
  //密碼
  var password = "123456"
  //輔助構(gòu)造器    
  def this(driver: String, url: String, user: String, pwd: String) {
    this()
    this.driver = driver
    this.url = url
    this.user = user
    this.password = pwd
  }
}
object MysqlDemo {
  //  實(shí)現(xiàn)apply方法
  def apply(): MysqlDemo = new MysqlDemo()
  def apply(driver: String, url: String, user: String, pwd: String): MysqlDemo = new MysqlDemo(driver, url, user, pwd)
  def main(args: Array[String]): Unit = {
    //創(chuàng)建對象，調(diào)用apply方法
    val demo = MysqlDemo()
    //導(dǎo)入MySQLUtil包
    import MysqlUtil._
    //調(diào)用創(chuàng)建連接的方法
    val connection: Connection = demo.conn()
    // 調(diào)用釋放資源方法
    demo.close(connection)
    //添加數(shù)據(jù)方法一
    val i: Int = demo.insertStudent
    if (i == 1) {
      println("添加成功")
    } else if (i == 0) {
      println("添加失敗")
    }
    //添加數(shù)據(jù)方法二
    val i: Int = demo.insertStudent("aaa", 18, "男", "12345678910", "34649756@qq.com", 1)
    if (i == 1) {
      println("添加成功")
    } else if (i == 0) {
      println("添加失敗")
    }
    //查詢數(shù)據(jù)
    demo.selectStudent
    // 修改數(shù)據(jù)
    val i: Int = demo.updateStudent(22, "test", 25, "女", "123456789", "369852@qq.com", 2)
    if (i == 1) {
      println("修改成功")
    } else if (i == 0) {
      println("修改失敗")
    }
    //刪除數(shù)據(jù)
    val i: Int = demo.deleteStudent(21)
    if (i == 1) {
      println("刪除成功")
    } else if (i == 0) {
      println("刪除失敗")
    }
  }
}

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