JDBC数据库连接

public class JDBC_tree {
 @Test
 public void JDBC_test() throws Exception {
//连接
  Class.forName("com.mysql.jdbc.Driver");//驱动加载
  Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/car", "root", "root");//获取连接对象
  Statement Stater = connection.createStatement();//创建连接语句
  
  String A = "CREATE TABLE animal(a_name varchar(20),a_age int,a_num int)";//创建表的命令
//执行语句
  Stater.executeUpdate(A);
//释放资源
  Stater.close();
  connection.close();
 }
}

public class JDBC_tree {
 @Test
 public void JDBC_test() throws Exception {
  Class.forName("com.mysql.jdbc.Driver");
  Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/car", "root", "root");
  Statement Stater = connection.createStatement();//创建连接语句
  ResultSet executeQuery = Stater.executeQuery( "SELECT *FROM animal");
  while (executeQuery.next()){
   String string = executeQuery.getString("a_name");
   int int1 = executeQuery.getInt("a_num");
   System.out.println(string +"="+int1);
  }
  Stater.close();
  connection.close();
 }
}
//建一个类,私有化里面的字段,生成geter和seter方法和tostring方法
public class A {
 private int age;
 private String name;
 private int num;
 public int getAge() {
  return age;
 }
 public void setAge(int age) {
  this.age = age;
 }
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 public int getNum() {
  return num;
 }
 public void setNum(int num) {
  this.num = num;
 }
 public String toString() {
  return "A [age=" + age + ", name=" + name + ", num=" + num + "]";
 }
}