结构:
Main:
package com
.zzu
.client
;
import java
.sql
.ResultSet
;
import java
.sql
.SQLException
;
import java
.util
.Scanner
;
import com
.zzu
.tool
.db
.DBLink
;
import com
.zzu
.tool
.db
.IRowMapper
;
public class Main {
public static void main(String
[] args
) {
System
.out
.println("*********************************");
System
.out
.println("*\t\t\t\t*");
System
.out
.println("*\t欢迎使用学生信息管理系统\t*");
System
.out
.println("*\t\t\t\t*");
System
.out
.println("*********************************");
while (true) {
menu();
}
}
static void menu() {
System
.out
.println("1、添加学生信息");
System
.out
.println("2、删除学生信息");
System
.out
.println("3、修改学生信息");
System
.out
.println("4、查询学生信息");
System
.out
.println("请输入操作,以Enter键结束:");
Scanner scanner
= new Scanner(System
.in
);
int option
= scanner
.nextInt();
DBLink dblink
= new DBLink();
switch (option
) {
case 1:{
System
.out
.println("请输入学号:");
String id
= scanner
.next();
System
.out
.println("请输入姓名:");
String name
= scanner
.next();
System
.out
.println("请输入手机号:");
String mobile
= scanner
.next();
System
.out
.println("请输入地址:");
String address
= scanner
.next();
String sql
= "select id from user_info where id=?";
if(dblink
.exist(sql
, id
)) {
System
.out
.println("学号已存在");
return;
}
sql
= "insert into user_info (id,name,mobile,address) values (?,?,?,?)";
if(dblink
.update(sql
,id
,name
,mobile
,address
)){
System
.out
.println("添加成功");
return;
}
System
.out
.println("添加失败");
break;
}
case 2:{
System
.out
.println("请输入学号:");
String id
= scanner
.next();
String sql
= "select id from user_info where id =?";
if(!dblink
.exist(sql
,id
)) {
System
.out
.println("学号不存在");
return;
}
sql
= "delete from user_info where id=?";
if(dblink
.update(sql
,id
)) {
System
.out
.println("删除成功");
return;
}
System
.out
.println("删除失败");
break;
}
case 3:{
System
.out
.println("请输入学号:");
String id
= scanner
.next();
String sql
= "select id from user_info where id =?";
if(!dblink
.exist(sql
,id
)) {
System
.out
.println("学号不存在");
return;
}
System
.out
.println("请输入新姓名:");
String name
= scanner
.next();
System
.out
.println("请输入新手机号:");
String mobile
= scanner
.next();
System
.out
.println("请输入新地址:");
String address
= scanner
.next();
sql
= "update user_info set name=? , mobile =? ,address =? where id ='"+id
+"'";
if(dblink
.update(sql
, name
,mobile
,address
)) {
System
.out
.println("修改成功!");
return;
}
System
.out
.println("修改失败");
break;
}
case 4:{
System
.out
.println("请输入学号:");
final String id
= scanner
.next();
String sql
= "select id from user_info where id=?";
if(!dblink
.exist(sql
,id
)) {
System
.out
.println("学号不存在!");
return;
}
sql
= "select id,name,mobile,address from user_info where id =?";
DBLink
.select(sql
,(ResultSet rs
) ->{
try {
if(rs
.next()) {
String name
= rs
.getString("name");
String mobile
= rs
.getString("mobile");
String address
= rs
.getString("address");
System
.out
.println(id
+","+name
+","+mobile
+","+address
);
}
} catch (SQLException e
) {
e
.printStackTrace();
}
},id
);
break;
}
default:
System
.out
.println("I'm Sorry,there is not the "+option
+" option,please try again.");
}
}
}
DBLink:
package com
.zzu
.tool
.db
;
import java
.sql
.Connection
;
import java
.sql
.DriverManager
;
import java
.sql
.PreparedStatement
;
import java
.sql
.ResultSet
;
import java
.sql
.SQLException
;
import java
.sql
.Statement
;
import org
.apache
.log4j
.Logger
;
import com
.zzu
.tool
.PropertiesTool
;
public class DBLink {
private static Logger logger
= Logger
.getLogger(DBLink
.class);
public static Connection
getConnection() {
try {
Class
.forName("com.mysql.jdbc.Driver");
String url
= PropertiesTool
.getVaule("db.url");
String userName
= PropertiesTool
.getVaule("db.username");
String password
= PropertiesTool
.getVaule("db.password");
return DriverManager
.getConnection(url
, userName
, password
);
} catch (Exception e
) {
logger
.debug(e
.getMessage(),e
);
}
return null
;
}
public boolean update(String sql
) {
Connection connection
=null
;
Statement statement
= null
;
try {
connection
= getConnection();
System
.out
.println(connection
);
statement
= connection
.createStatement();
int affect
= statement
.executeUpdate(sql
);
if(affect
>0) {
System
.out
.println("OK");
}else
System
.out
.println("NO");
statement
.close();
connection
.close();
return affect
>0;
} catch (Exception e
) {
logger
.debug(e
.getMessage(),e
);
}finally {
close(statement
,connection
);
}
return false;
}
public static boolean update(String sql
,Object
...pramas
) {
Connection connection
=null
;
PreparedStatement preparedStatement
= null
;
try {
connection
= getConnection();
preparedStatement
= connection
.prepareStatement(sql
);
for (int i
= 0; i
< pramas
.length
; i
++) {
preparedStatement
.setObject(i
+1,pramas
[i
]);
}
return preparedStatement
.executeUpdate()>0;
} catch (Exception e
) {
logger
.debug(e
.getMessage(),e
);
}finally {
close(preparedStatement
,connection
);
}
return false;
}
public static void select(String sql
,IRowMapper rowMapper
,Object
...pramas
) {
Connection connection
= null
;
PreparedStatement preparedStatement
=null
;
ResultSet resultSet
=null
;
try {
connection
= getConnection();
preparedStatement
= connection
.prepareStatement(sql
);
for (int i
= 0; i
< pramas
.length
; i
++) {
preparedStatement
.setObject(i
+1,pramas
[i
]);
}
resultSet
= preparedStatement
.executeQuery();
rowMapper
.rowMapper(resultSet
);
} catch (Exception e
) {
logger
.debug(e
.getMessage(),e
);
}finally {
close(preparedStatement
,connection
,resultSet
);
}
}
public static boolean exist(String sql
) {
Connection connection
= null
;
Statement statement
=null
;
ResultSet resultSet
=null
;
try {
connection
= getConnection();
statement
= connection
.createStatement();
resultSet
= statement
.executeQuery(sql
);
return resultSet
.next();
} catch (Exception e
) {
logger
.debug(e
.getMessage(),e
);
}finally {
close(statement
,connection
,resultSet
);
}
return false;
}
public static boolean exist(String sql
,Object
...params
) {
Connection connection
= null
;
PreparedStatement preparedStatement
=null
;
ResultSet resultSet
=null
;
try {
connection
= getConnection();
preparedStatement
= connection
.prepareStatement(sql
);
for (int i
= 0; i
< params
.length
; i
++) {
preparedStatement
.setObject(i
+1, params
[i
]);
}
resultSet
= preparedStatement
.executeQuery();
return resultSet
.next();
} catch (Exception e
) {
logger
.debug(e
.getMessage(),e
);
}finally {
close(preparedStatement
,connection
,resultSet
);
}
return false;
}
private static void close(Statement statement
,Connection connection
) {
try {
if(statement
!=null
) {
statement
.close();
}
} catch (SQLException e
) {
e
.printStackTrace();
}
try {
if(connection
!=null
) {
connection
.close();
}
} catch (SQLException e
) {
logger
.debug(e
.getMessage(),e
);
}
}
private static void close(Statement statement
,Connection connection
,ResultSet resultSet
) {
try {
if(resultSet
!=null
) {
resultSet
.close();
}
} catch (SQLException e
) {
e
.printStackTrace();
}
try {
if(statement
!=null
) {
statement
.close();
}
} catch (SQLException e
) {
e
.printStackTrace();
}
try {
if(connection
!=null
) {
connection
.close();
}
} catch (SQLException e
) {
logger
.debug(e
.getMessage(),e
);
}
}
}
IRowMapper:
package com
.zzu
.tool
.db
;
import java
.sql
.ResultSet
;
public interface IRowMapper {
void rowMapper(ResultSet rs
);
}
PropertiesTool:
package com
.zzu
.tool
;
import java
.io
.IOException
;
import java
.io
.InputStream
;
import java
.util
.Properties
;
public class PropertiesTool {
private static Properties properties
= new Properties();
static {
InputStream inputStream
= PropertiesTool
.class.getClassLoader().getResourceAsStream("db.properties");
try {
properties
.load(inputStream
);
} catch (IOException e
) {
e
.printStackTrace();
}
}
public static String
getVaule(String key
) {
return properties
.getProperty(key
);
}
public static void main(String
[] args
) {
}
}
db.properties:
db.username=root db.password=root db.url=jdbc:mysql://127.0.0.1:3306/test
log4.properties:
# DEBUG\u8BBE\u7F6E\u8F93\u51FA\u65E5\u5FD7\u7EA7\u522B\uFF0C\u7531\u4E8E\u4E3ADEBUG\uFF0C\u6240\u4EE5ERROR\u3001WARN\u548CINFO \u7EA7\u522B\u65E5\u5FD7\u4FE1\u606F\u4E5F\u4F1A\u663E\u793A\u51FA\u6765 log4j.rootLogger=DEBUG,Console,RollingFile
#\u5C06\u65E5\u5FD7\u4FE1\u606F\u8F93\u51FA\u5230\u63A7\u5236\u53F0 log4j.appender.Console=org.apache.log4j.ConsoleAppender log4j.appender.Console.layout=org.apache.log4j.PatternLayout log4j.appender.Console.layout.ConversionPattern= [%-5p]-[%d{yyyy-MM-dd HH:mm:ss}] -%l -%m%n #\u5C06\u65E5\u5FD7\u4FE1\u606F\u8F93\u51FA\u5230\u64CD\u4F5C\u7CFB\u7EDFD\u76D8\u6839\u76EE\u5F55\u4E0B\u7684log.log\u6587\u4EF6\u4E2D log4j.appender.RollingFile=org.apache.log4j.DailyRollingFileAppender log4j.appender.RollingFile.File=D://log.log log4j.appender.RollingFile.layout=org.apache.log4j.PatternLayout log4j.appender.RollingFile.layout.ConversionPattern=%d [%t] %-5p %-40.40c %X{traceId}-%m%n
pom.xml:
<project xmlns
="http://maven.apache.org/POM/4.0.0" xmlns
:xsi
="http://www.w3.org/2001/XMLSchema-instance"
xsi
:schemaLocation
="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion
>
<groupId>com
.jd
</groupId
>
<artifactId>sirius
</artifactId
>
<packaging>war
</packaging
>
<version>0.0.1-SNAPSHOT
</version
>
<name>sirius Maven Webapp
</name
>
<url>http
://maven
.apache
.org
</url
>
<dependencies>
<dependency>
<groupId>junit
</groupId
>
<artifactId>junit
</artifactId
>
<version>3.8.1</version
>
<scope>test
</scope
>
</dependency
>
<!-- https
://mvnrepository
.com
/artifact
/mysql
/mysql
-connector
-java
-->
<dependency>
<groupId>mysql
</groupId
>
<artifactId>mysql
-connector
-java
</artifactId
>
<version>5.1.47</version
>
</dependency
>
<dependency>
<groupId>log4j
</groupId
>
<artifactId>log4j
</artifactId
>
<version>1.2.17</version
>
</dependency
>
<!-- https
://mvnrepository
.com
/artifact
/javax
.servlet
/javax
.servlet
-api
-->
<dependency>
<groupId>javax
.servlet
</groupId
>
<artifactId>javax
.servlet
-api
</artifactId
>
<version>3.1.0</version
>
<scope>provided
</scope
>
</dependency
>
</dependencies
>
<build>
<finalName>sirius
</finalName
>
</build
>
<profiles>
<profile>
<id>jdk1
.8</id
>
<activation>
<activeByDefault>true</activeByDefault
>
<jdk>1.8</jdk
>
</activation
>
<properties>
<maven
.compiler
.source
>1.8</maven
.compiler
.source
>
<maven
.compiler
.target
>1.8</maven
.compiler
.target
>
<maven
.compiler
.compilerVersion
>1.8</maven
.compiler
.compilerVersion
>
</properties
>
</profile
>
</profiles
>
</project
>