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這篇文章主要講解了“Java Scala怎么實現數據庫增刪查改操作”，文中的講解內容簡單清晰，易于學習與理解，下面請大家跟著小編的思路慢慢深入，一起來研究和學習“Java Scala怎么實現數據庫增刪查改操作”吧！
這里的Scala不是maven工程所以要找到項目結構（快捷鍵：同時按住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
實現操作數據庫需要兩個類，一個用于測試的Demo，一個用于實現增刪查改的Util方法
在MysqlDemo在這里需要用到伴生類和伴生對象，伴生類主要是實現連接數據庫
class MysqlDemo {
// 連接數據庫 底層原理還是jdbc
//驅動名稱
var driver = "com.mysql.cj.jdbc.Driver"
// 訪問MySQL服務器，通過3306端口訪問mysql數據庫
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現操作數據庫 ，需要先實現apply方法，主函數里面創建對象調用apply方法，調用連接方法和釋放資源
object MysqlDemo {
// 實現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 = {
//創建對象，調用apply方法
val demo = MysqlDemo()
//導入MySQLUtil包
import MysqlUtil._
//調用創建連接的方法
demo.conn()
// 調用釋放資源方法
demo.close(connection)
/**操作數據庫代碼*/
}Util則需要先初始化數據庫連接，注冊驅動，得到數據庫連接，釋放資源
import java.sql.{Connection, DriverManager, PreparedStatement, ResultSet}
object MysqlUtil {
implicit class MysqlOp(obj: MysqlDemo) {
//初始化數據連接
private var connection: Connection = _
def conn(): Connection = {
//注冊driver
Class.forName(obj.driver)
//得到數據庫連接
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()
}
}
}準備工作已做完下面要實現對數據庫的增刪查改
//Util代碼
//添加數據方法一
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
//添加數據方法一
val i: Int = demo.insertStudent
if (i == 1) {
println("添加成功")
} else if (i == 0) {
println("添加失敗")
}//Util代碼
//添加數據方法二
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
//添加數據方法二
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")
}//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")
}//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("學號\t姓名\t年齡\t性別\t手機號\t郵箱\t班級編號")
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//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")
}import java.sql.{Connection, DriverManager, PreparedStatement, ResultSet}
object MysqlUtil {
implicit class MysqlOp(obj: MysqlDemo) {
//初始化數據連接
private var connection: Connection = _
def conn(): Connection = {
//注冊driver
Class.forName(obj.driver)
//得到數據庫連接
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()
}
}
//添加數據方法一
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
}
//添加數據方法二
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
}
//刪除數據
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
}
//修改數據
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
}
//查詢數據
def selectStudent: Unit = {
val selectSql = "select id,name, age, gender, telephone, email, classid from student"
val rs: ResultSet = conn().createStatement().executeQuery(selectSql)
println("學號\t姓名\t年齡\t性別\t手機號\t郵箱\t班級編號")
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)
}
}
}
}import java.sql.Connection
class MysqlDemo {
// 連接數據庫 底層原理還是jdbc
//驅動名稱
var driver = "com.mysql.cj.jdbc.Driver"
// 訪問MySQL服務器，通過3306端口訪問mysql數據庫
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 {
// 實現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 = {
//創建對象，調用apply方法
val demo = MysqlDemo()
//導入MySQLUtil包
import MysqlUtil._
//調用創建連接的方法
val connection: Connection = demo.conn()
// 調用釋放資源方法
demo.close(connection)
//添加數據方法一
val i: Int = demo.insertStudent
if (i == 1) {
println("添加成功")
} else if (i == 0) {
println("添加失敗")
}
//添加數據方法二
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")
}
//查詢數據
demo.selectStudent
// 修改數據
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")
}
//刪除數據
val i: Int = demo.deleteStudent(21)
if (i == 1) {
println("刪除成功")
} else if (i == 0) {
println("刪除失敗")
}
}
}感謝各位的閱讀，以上就是“Java Scala怎么實現數據庫增刪查改操作”的內容了，經過本文的學習后，相信大家對Java Scala怎么實現數據庫增刪查改操作這一問題有了更深刻的體會，具體使用情況還需要大家實踐驗證。這里是億速云，小編將為大家推送更多相關知識點的文章，歡迎關注！
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