如何使用純Java方式連接數據庫?

假定需要連接的數據庫名稱為`myschool`,使用"root"登錄,密碼為"0000",使用該數據庫用戶登錄並訪問`myschool`數據庫。

在寫代碼之前需要導入jar包"mysql-connector-java-5.1.0-bin"

1.使用純Java方式連接數據庫查找數據(為方便查閱,暫使用throws拋出異常,省略記錄日志)。

package cn.jbdc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

/**
* jdbc程序
* @author Administrator
*
*/
public class JdbcDemo01 {
public static void main(String[] args) throws Exception {
//1.加載數據庫驅動
Class.forName("com.mysql.jdbc.Driver");
//2.與數據庫連接
Connection connection=DriverManager.getConnection("jdbc:mysql://localhost:3306/myschool", "root", "0000");
//測試連接
System.out.println(connection);
//3.創建執行sql語句的對象
Statement stmt = connection.createStatement();
//4.執行sql語句獲取結果集
ResultSet rs = stmt.executeQuery("select * from subject");
//5.遍歷結果集獲取數據
while(rs.next()){
int subjectNo = rs.getInt("SubjectNo");
String SubjectName = rs.getString("SubjectName");
int classHour = rs.getInt("ClassHour");
int gradeID = rs.getInt("GradeID");

System.out.println(subjectNo+"\t"+SubjectName+"\t"+classHour+"\t"+gradeID);
}
//6.釋放資源
rs.close();
stmt.close();
connection.close();
}
}

2.使用純Java方式連接數據庫實現增刪改操作(增刪改操作都使用executeUpdate方法)

package cn.bdqn.demo;

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

//JDBC實現添加
public class JdbcDemo3 {
public static void main(String[] args) {
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/myschool", "root", "0000");
stmt = conn.createStatement();
int i = stmt.executeUpdate("INSERT INTO `subject`(SubjectName,ClassHour,GradeID) VALUES ('歷史',101,1)");
if (i > 0){
System.out.println("添加成功!");
}
} catch (Exception e) {
e.printStackTrace();
} finally {
// 釋放資源
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
rs = null;
}
if (stmt != null) {
try {
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
stmt = null;
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
conn = null;
}
}
}
}