JDBC增删改查以及封装数据
我太爱我的java张春凤老师了，张春凤老师永远滴女神！
下面是我的mysql信息：
我的mysql为5.5版本，老东西了见谅哈！mysql版本不同，connection连接的内容也不一样，这个需要注意！还有就是注意端口号，账号密码，sql语句要正确填写哦！！！
下面是jdbc的增删改部分：
package will.delete.test;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
//增删改
public class TestZSG {
public static void main(String[] args) {
Statement statement = null;
Connection connection = null;
try {
Class.forName("com.mysql.jdbc.Driver");
String sql = "UPDATE academy_info SET academy_name = '狐闹' WHERE id = 3";
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/zua_stuablity?characterEncoding=utf8",
"root", "wdc123");
statement = connection.createStatement();
int count = statement.executeUpdate(sql);
System.out.println(count);
if (count > 0) {
System.out.println("ok");
} else {
System.out.println("no");
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (statement != null) {
try {
statement.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (connection != null) {
try {
connection.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
下面是普通的jdbc的查看部分：
package will.delete.test;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Date;
public class TestCha {
public static void main(String[] args) {
Connection connection = null;
Statement statement = null;
ResultSet resultSet = null;
try {
Class.forName("com.mysql.jdbc.Driver");
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/zua_stuablity?characterEncoding=utf8",
"root", "wdc123");
String sql = "SELECT * FROM academy_info";
statement = connection.createStatement();
resultSet = statement.executeQuery(sql);
while (resultSet.next()) {
int id = resultSet.getInt("id");
String name = resultSet.getString("academy_name");
Date time = resultSet.getDate("create_time");
int flag = resultSet.getInt("delete_flag");
System.out.println(id + "#" + name + "#" + time + "#" + flag);
}
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (resultSet != null) {
try {
resultSet.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (statement != null) {
try {
statement.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (connection != null) {
try {
connection.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
下面是list封装对象的jdbc的查看部分：
1.平平无奇的getter setter tostring方法
package cn.itcast.demoList;
import java.util.Date;
//封装academy_info表数据的JavaBean
public class academy_info {
private int id;
private String academy_name;
private Date create_time;
private int delete_flag;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getAcademy_name() {
return academy_name;
}
public void setAcademy_name(String academy_name) {
this.academy_name = academy_name;
}
public Date getCreate_time() {
return create_time;
}
public void setCreate_time(Date create_time) {
this.create_time = create_time;
}
public int getDelete_flag() {
return delete_flag;
}
public void setDelete_flag(int delete_flag) {
this.delete_flag = delete_flag;
}
@Override
public String toString() {
return "academy_info [id=" + id + ", academy_name=" + academy_name + ", create_time=" + create_time
+ ", delete_flag=" + delete_flag + "]";
}
}
2.list的细节操作
package cn.itcast.demoList;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
public class Test {
public static void main(String[] args) {
List<academy_info> list = new Test().findall();
System.out.println(list);
System.out.println(list.size());
}
public List<academy_info> findall() {
Connection connection = null;
Statement statement = null;
ResultSet resultSet = null;
List<academy_info> list = null;
try {
Class.forName("com.mysql.jdbc.Driver");
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/zua_stuablity?characterEncoding=utf8",
"root", "wdc123");
String sql = "SELECT * FROM academy_info";
statement = connection.createStatement();
resultSet = statement.executeQuery(sql);
academy_info aInfo = null;
list = new ArrayList<academy_info>();
while (resultSet.next()) {
int id = resultSet.getInt("id");
String name = resultSet.getString("academy_name");
Date time = resultSet.getDate("create_time");
int flag = resultSet.getInt("delete_flag");
aInfo = new academy_info();
aInfo.setId(id);
aInfo.setAcademy_name(name);
aInfo.setCreate_time(time);
aInfo.setDelete_flag(flag);
list.add(aInfo);
}
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
resultSet.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
statement.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
connection.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return list;
}
}
jdbc冲刺！