pox.xml 导入包
<dependency>
<groupId>junit</groupId> <!--junit单元测试-->
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency> <!--junit单元测试-->
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>compile</scope>
</dependency>
<dependency> <!--mybatis 依赖-->
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.6</version>
</dependency>
<dependency> <!--mysql 依赖-->
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.48</version>
</dependency>
<dependency> <!--log 日志-->
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.12.1</version>
</dependency>
<dependency> <!--log 日志-->
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.12.1</version>
</dependency>
<dependency> <!-- druid 阿里提供的mysql连接池 -->
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.21</version>
</dependency>
<dependency> <!--commons-logging jdbc template 需要的包-->
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
<dependency> <!--commons-logging jdbc template 需要的包-->
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
<dependency> <!--spring-core jdbc template 需要的包-->
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
<dependency> <!--spring-jdbc jdbc template 需要的包-->
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
<dependency> <!--spring-tx jdbc template 需要的包-->
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
创建resources文件夹 放置配置文件
resources-->druid.properties 数据库配置文件
driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql://10.133.3.26:3306/mybatis_test?useUnicode=true&characterEncoding=utf8&useSSL=false
username=root
password=root
# 初始化连接数量
initialSize=5
# 最大连接数
maxActive=10
# 最大等待时间
maxWait=3000
resources-->log4j2.xml 日志配置文件
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="%d{YYYY-MM-dd HH:mm:ss} [%t] %-5p %c{1}:%L - %msg%n"/>
</Console>
<RollingFile name="RollingFile" filename="log/test.log"
filepattern="${logPath}/%d{YYYYMMddHHmmss}-fargo.log">
<PatternLayout pattern="%d{YYYY-MM-dd HH:mm:ss} [%t] %-5p %c{1}:%L - %msg%n"/>
<Policies>
<SizeBasedTriggeringPolicy size="10 MB"/>
</Policies>
<DefaultRolloverStrategy max="20"/>
</RollingFile>
</Appenders>
<Loggers>
<Root level="info">
<AppenderRef ref="Console"/>
<AppenderRef ref="RollingFile"/>
</Root>
</Loggers>
</Configuration>
创建java-->utils文件夹
java-->utils-->JDBCUtils jdbc普通封装
package mysql.java.utils;
import com.alibaba.druid.pool.DruidDataSourceFactory;
import javax.sql.DataSource;
import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
// Druid连接池的工具类
public class JDBCUtils {
//1.定义成员变量 DataSource
private static DataSource ds;
static {
try {
//1.加载配置文件
Properties pro = new Properties();
pro.load(JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties"));
//2.获取DataSource
ds = DruidDataSourceFactory.createDataSource(pro);
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
// 获取连接
public static Connection getConnection() throws SQLException {
return ds.getConnection();
}
// 释放资源
public static void close(Statement stmt, Connection conn) {
close(null, stmt, conn);
}
public static void close(ResultSet rs, Statement stmt, Connection conn) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (stmt != null) {
try {
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (conn != null) {
try {
conn.close();//归还连接
} catch (SQLException e) {
e.printStackTrace();
}
}
}
// 获取连接池方法
public static DataSource getDataSource() {
return ds;
}
}
domain --> Emp.java object对象
package mysql.domain;
import java.util.Date;
public class Emp {
private Integer id;
private String username;
private Date birthday;
private String sex;
private String address;
@Override
public String toString() {
return "Emp{" +
"id=" + id +
", username='" + username + '\'' +
", birthday=" + birthday +
", sex='" + sex + '\'' +
", address='" + address + '\'' +
'}';
}
public void setId(Integer id) {
this.id = id;
}
public void setUsername(String username) {
this.username = username;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public void setSex(String sex) {
this.sex = sex;
}
public void setAddress(String address) {
this.address = address;
}
public Integer getId() {
return id;
}
public String getUsername() {
return username;
}
public Date getBirthday() {
return birthday;
}
public String getSex() {
return sex;
}
public String getAddress() {
return address;
}
public Emp(Integer id, String username, Date birthday, String sex, String address) {
this.id = id;
this.username = username;
this.birthday = birthday;
this.sex = sex;
this.address = address;
}
public Emp() {
}
}
jdbctemplate --> JdbcTmpalateDome.java 数据库操作
package mysql.jdbctemplate;
import mysql.domain.Emp;
import mysql.java.utils.JDBCUtils;
import org.junit.Before;
import org.junit.Test;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Map;
public class JdbcTemplateDome01 {
private JdbcTemplate template;
@Before
public void init() {
template = new JdbcTemplate(JDBCUtils.getDataSource()); // 获取JDBCTemplate对象
}
@Test
public void selectSql() { // 查询数据
String sql = "UPDATE user set address=? WHERE id=?";
int count = template.update(sql, "杭州", "49");
System.out.println(count);
}
@Test
public void insterSql() { // 插入一条数据
String sql = "INSERT INTO user(username, birthday, sex, address) values(?, ?, ?, ?)";
String date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
int count = template.update(sql, "yoyo", date, "男", "上海");
System.out.println(count);
}
@Test
public void deleteSql() { // 删除一条数据
String sql = "DELETE from user WHERE id=?";
int count = template.update(sql, 50);
System.out.println(count);
}
/**
* queryForMap:查询结果将结果集封装为map集合，将列名作为key，将值作为value 将这条记录封装为一个map集合
* 这个方法查询的结果集长度只能是1
*/
@Test
public void selectMap() { // 查询一条数据 封装成map集合
String sql = "select * from user where id=?";
Map<String, Object> map = template.queryForMap(sql, 49);
System.out.println(map);
}
/**
* queryForList:查询结果将结果集封装为list集合
* 将每一条记录封装为一个Map集合，再将Map集合装载到List集合中
*/
@Test
public void selectListMap() { // 查询所有数据封装为list
String sql = "select * from user";
List<Map<String, Object>> mapList = template.queryForList(sql);
for (Map<String, Object> map : mapList) {
System.out.println(map);
}
}
/**
* query:查询结果，将结果封装为JavaBean对象
* uery的参数：RowMapper
* 一般我们使用BeanPropertyRowMapper实现类。可以完成数据到JavaBean的自动封装
* new BeanPropertyRowMapper<类型>(类型.class)
*/
@Test
public void selectListEnp() { // 查询所有记录，将其封装为Emp对象的List集合
String sql = "select * from user";
List<Emp> list = template.query(sql, new BeanPropertyRowMapper<Emp>(Emp.class));
for (Emp emp : list) {
System.out.println(emp);
}
}
/**
* queryForObject:查询结果，将结果封装为对象
* 一般用于聚合函数的查询
*/
@Test
public void selectObject() { // 查询总记录数
String sql = "select count(id) from user";
Long total = template.queryForObject(sql, Long.class);
System.out.println(total);
}
}
