jdbc --例子7
package cn.kitty.o1; import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException; public class Test { public static void main(String[] args){
Connection conn=null; try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//2.
try {
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/epet?useUnicode=true&characterEncoding=utf-8","root","");
System.out.println("连接成功");
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
//
if (null!=conn) {
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} }
}
package cn.kitty.o1; import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement; //Statement
public class Test02 {
public static void main(String[] args) {
Connection conn=null;
Statement stmt=null;
String name="kitty";
int health=100;
int love =10;
String strain="可爱的小公举3";
//
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//2.
try {
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/epet","root","");
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
//3.
try {
stmt=conn.createStatement();
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
StringBuffer sbSql=new StringBuffer(
"insert into dog(name,health,love,strain)values('");
sbSql.append(name+"',");
sbSql.append(health+",");
sbSql.append(love+",'");
sbSql.append(strain+"')");
try {
stmt.execute(sbSql.toString());
System.out.println("添加数据成功");
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
if (null !=stmt) {
stmt.close();
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} try {
if(null!=conn){
conn.close();
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace(); }
} }
}
package cn.kitty.o1; import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement; //更新宠物Statement
public class Test03 {
public static void main(String[] args) {
Connection conn=null;
Statement stmt=null; //1.加载驱动
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//2.建立连接
try {
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/epet","root",""); stmt=conn.createStatement();
stmt.executeUpdate("update dog set health=1000,love=1500 where id=1");
System.out.println("成功更新狗狗信息");
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}finally{
try {
if (null !=stmt) {
stmt.close();
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} try {
if(null!=conn){
conn.close();
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace(); }
} } }
package cn.kitty.o1; import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement; //查询所有宠物Statement和ResultSet
public class Test04 {
public static void main(String[] args) {
Connection conn=null;
Statement stmt=null;
ResultSet rs=null;
//
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//2.
try {
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/epet","root","");
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
//3.查询并输入狗狗信息
try {
stmt=conn.createStatement();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
rs=stmt.executeQuery("select id,name,health,love,strain from dog");
System.out.println("狗狗信息列表");
System.out.println("编号\t姓名\t健康值\t亲密度\t品种");
while(rs.next()){
System.out.print(rs.getInt(1)+"\t");
System.out.print(rs.getString(2)+"\t");
System.out.print(rs.getInt("health")+"\t");
System.out.print(rs.getInt("love")+"\t");
System.out.println(rs.getString("strain"));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
if(null!=rs){
try {
rs.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(null!=stmt){
try {
stmt.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(null!=conn){
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} }
}
package cn.kitty.o1; import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement; //查询并输出宠物主人信息
public class Test05 {
public static void main(String[] args) {
Connection conn=null;
Statement stmt=null;
ResultSet rs=null;
//
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//2.
try {
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/epet","root","");
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
//3.
try {
stmt=conn.createStatement();
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
rs=stmt.executeQuery("select id ,name,money from master");
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("主人信息列表");
System.out.println("编号\t姓名\t元宝数");
try {
while(rs.next()){
System.out.print(rs.getInt("id")+"\t");
System.out.print(rs.getString("name")+"\t");
System.out.println(rs.getInt("money")); }
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
if(null!=rs){
try {
rs.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(null!=stmt){
try {
stmt.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(null!=conn){
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
package cn.kitty.o1; import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Scanner; //
public class Test06 {
public static void main(String[] args) {
Connection conn=null;
Statement stmt=null;
ResultSet rs=null;
//根据控制台提示输入用户账号和密码
Scanner input =new Scanner(System.in);
System.out.println("宠物主人登录");
System.out.println("请输入姓名：");
String name =input.next();
System.out.println("请输入密码：");
String password=input.next();
//1.加载驱动
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//2.
try {
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/epet?useUnicode=true&characterEncoding=utf-8","root","");
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
//判断宠物主人登录成功
try {
stmt=conn.createStatement();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String sql="select * from master where name='"+name+"' and password='"+password+"'";
System.out.println(sql);
try {
rs=stmt.executeQuery(sql);
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
if(rs.next())
System.out.println("登录成功，欢迎你");
else
System.out.println("登录失败，请重新输入！");
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
if(null!=rs){
try {
rs.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(null!=stmt){
try {
stmt.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(null!=conn){
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} }
}
package cn.kitty.o1; import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException; //preparedStatment 更新多条狗狗信息
public class Test07 {
public static void main(String[] args) {
Connection conn=null;
PreparedStatement pstmt=null;
//1.加载驱动
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//2.建立连接
try {
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/epet?useUnicode=true&characterEncoding=utf-8","root","");
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
//3.更新狗狗数据到数据库
String sql="update dog set health=?,love=? where id=?";
try {
pstmt=conn.prepareStatement(sql);
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
pstmt.setInt(1, 90);
pstmt.setInt(2, 90);
pstmt.setInt(3, 1);
pstmt.executeUpdate();
pstmt.setInt(1, 90);
pstmt.setInt(2, 90);
pstmt.setInt(3, 2);
pstmt.executeUpdate();
System.out.println("更新狗狗信息成功");
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}finally{ if(null!=pstmt){
try {
pstmt.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(null!=conn){
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} } }}
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