mybatis（一）-----建立maven專案
阿新 • • 發佈：2018-12-11
第一步：建立新專案，按圖如下：
接下來：
接下來照著填：
接下來：下一步，下一步，一直到建立：
建立完成。
後續：
第一步：修改maven專案中的pom.xml檔案
程式碼如下：
<?xml version="1.0" encoding="UTF-8"?> <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/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.zit</groupId> <artifactId>mybatis01</artifactId> <version>1.0-SNAPSHOT</version> <packaging>war</packaging> <name>mybatis01</name> <dependencies> <!-- https://mvnrepository.com/artifact/junit/junit --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.6</version> </dependency> <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.12</version> </dependency> </dependencies> <build> <finalName>${project.artifactId}</finalName> <testSourceDirectory>src/test/java</testSourceDirectory> <sourceDirectory>src/main/java</sourceDirectory> <!-- 解決無法載入資源配置檔案 --> <resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> <include>**/*.properties</include> </includes> </resource> <resource> <directory>src/main/resources</directory> <includes> <include>**/*.xml</include> <include>**/*.properties</include> </includes> </resource> </resources> </build> </project>
專案有問題暫時不用擔心，接著往下進行。
把左邊的專案結構變成如下：
然後pom.xml恢復正常。
接下來：
在專案src/main/resources/mybatis-config.xml中輸入程式碼：
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <environments default="development"> <environment id="development"> <transactionManager type="JDBC"/> <dataSource type="POOLED"> <property name="driver" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/dt_game?usrSSL=false&serverTimezone=PRC"/> <property name="username" value="root"/> <property name="password" value=""/> </dataSource> </environment> </environments> <mappers> <mapper class="com.fz.mapper.StudentMapper"/> </mappers> </configuration>
上面有和資料庫相連的資訊，注意和自己的資料庫一一對應。
資料庫資訊 localhost db student root 3306 資料庫名稱為 db 賬號 root 密碼 埠3306 表資料資訊 mysql> select * from student; +--------+--------+-------+------------------+ | id | name | score | address | +--------+--------+-------+------------------+ | 201601 | 李四 | 90 | 鄭州市文化路68號 | | 201602 | 張三丰 | 30 | 鄭州市東風路68號 | +--------+--------+-------+------------------+ 2 rows in set (0.01 sec)
配置就算簡單完成了。
簡單實驗：
需要三個檔案：
第一：src/main/java/com/zit/entity/建立Book.java,程式碼：
package com.zit.entity;
import java.math.BigDecimal;
import java.util.Date;
public class Book {
private int id;
private String name;
private BigDecimal price;
private Date btime;
public Book() {
}
public Book(int id, String name, BigDecimal price, Date btime) {
this.id = id;
this.name = name;
this.price = price;
this.btime = btime;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public BigDecimal getPrice() {
return price;
}
public void setPrice(BigDecimal price) {
this.price = price;
}
public Date getBtime() {
return btime;
}
public void setBtime(Date btime) {
this.btime = btime;
}
}
第二：src/main/java/com/zit/mapper/目錄下建立介面BookMapper程式碼如下：
package com.zit.mapper;
import com.zit.entity.Book;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import java.util.List;
public interface BookMapper {
@Insert("insert into book values(null,#{name},#{price},#{btime})")
public int save(Book book);
@Select("select * from book")
public List<Book> queryAll();
@Delete("delete from book where id=#{id}")
public int deleteById(int id);
}
第三：src/main/resources/conf.xml檔案相應的修改如下：
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/dt_game?usrSSL=false&serverTimezone=PRC"/>
<property name="username" value="root"/>
<property name="password" value=""/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper class="com.zit.mapper.BookMapper"/>
</mappers>
</configuration>最後在：src/main/test/java/目錄下新建Demo.java檔案：
程式碼如下：
import com.zit.entity.Book;
import com.zit.mapper.BookMapper;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import java.io.Reader;
import java.math.BigDecimal;
import java.util.Date;
import java.util.List;
public class Demo {
protected SqlSessionFactory sf;
protected SqlSession session;
protected BookMapper bdao;
@Before
public void init() {
System.out.println(3333);
try {
System.out.println("hello");
Reader reader = Resources.getResourceAsReader("conf.xml");
sf = new SqlSessionFactoryBuilder().build(reader);
session = sf.openSession();
bdao = session.getMapper(BookMapper.class);
} catch (Exception e) {
e.printStackTrace();
}
}
@After
public void close(){
session.commit();
}
@Test
public void query() {
System.out.println(33);
List<Book> bks = bdao.queryAll();
for (Book b : bks) {
System.out.println(b.getName());
}
}
@Test
public void add() {
Book bk = new Book();
bk.setName("《web開發集合》");
bk.setPrice(new BigDecimal(80));
bk.setBtime(new Date());
bdao.save(bk);
}
@Test
public void del(){
bdao.deleteById(3);
}
}
單個測試，都是可以成功的，完成
目錄結構不清楚的看下圖：
