public class JDBCDemo {

    public static void main(String[] args) throws Exception {
        //1. 注冊(cè)驅(qū)動(dòng)
        Class.forName("com.mysql.jdbc.Driver");
        //2. 獲取連接
        String url = "jdbc:mysql://localhost:3306/blog?useSSL=false";
        String username = "root";
        String ppassword = "abc123";//密碼
        Connection conn = DriverManager.getConnection(url, username, password);
        //接收輸入的查詢(xún)條件
        String gender = "男";
        //3. 定義sql
        String sql = "select * from student where gender=?";
        //4. 獲取sql執(zhí)行對(duì)象
        Statement stmt = conn.createStatement();
        //設(shè)置參數(shù)的值
        pstmt.setString(1,gender);
        //5. 執(zhí)行sql
        ResultSet rs = stmt.executeQuery(sql);
        //6. 處理結(jié)果
        //遍歷結(jié)果集，獲取數(shù)據(jù)，封裝為對(duì)象，裝入集合
        Student s = null;
        List<Student> students = new ArrayList<>();
        while (rs.next()) {
            s = new Student();
            int id = rs.getInt(1);
            String name = rs.getString(2);
            String gender = rs.getString(3);

            s.setId(id);
            s.setName(name);
            s.setGender(gender);

            students.add(s);
        }
        System.out.println(students);
        //7. 釋放資源
        rs.close();
        stmt.close();
        conn.close();
    }
}

//1. 注冊(cè)驅(qū)動(dòng)
Class.forName("com.mysql.jdbc.Driver");
//2. 獲取連接
String url = "jdbc:mysql://localhost:3306/blog?useSSL=false";
String username = "root";
String ppassword = "abc123";//密碼
Connection conn = DriverManager.getConnection(url, username, password);
//接收輸入的查詢(xún)條件
String gender = "男";
//3. 定義sql
String sql = "select * from student where gender=?";

//設(shè)置參數(shù)的值
pstmt.setString(1,gender);
//5. 執(zhí)行sql
ResultSet rs = stmt.executeQuery(sql);
//6. 處理結(jié)果
//遍歷結(jié)果集，獲取數(shù)據(jù)，封裝為對(duì)象，裝入集合
Student s = null;
List<Student> students = new ArrayList<>();
while (rs.next()) {
    s = new Student();
    int id = rs.getInt(1);
    String name = rs.getString(2);
    String gender = rs.getS  
    s.setId(id);
    s.setName(name);
    s.setGender  
    students.add(s);
}

List<Student> students = sqlSession.selectList("test.selectAll"); //參數(shù)是一個(gè)字符串，該字符串必須是映射配置文件的namespace.id

drop table if exists student;

create table student(
	id int primary key auto_increment,
	name varchar(10),
	gender char(1)
);

insert into student(name,gender) values
('張三','男'),
('李四','女'),
('王五','男');

<dependencies>
    <!--mybatis 依賴(lài)-->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.5</version>
    </dependency>

    <!--mysql 驅(qū)動(dòng)-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.46</version>
    </dependency>

    <!--junit 單元測(cè)試-->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.13</version>
        <scope>test</scope>
    </dependency>

    <!-- 添加slf4j日志api -->
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.20</version>
    </dependency>
    <!-- 添加logback-classic依賴(lài) -->
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-classic</artifactId>
        <version>1.2.3</version>
    </dependency>
    <!-- 添加logback-core依賴(lài) -->
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-core</artifactId>
        <version>1.2.3</version>
    </dependency>
</dependencies>

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <!--
        CONSOLE ：表示當(dāng)前的日志信息是可以輸出到控制臺(tái)的。
    -->
    <appender name="Console" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>[%level] %blue(%d{HH:mm:ss.SSS}) %cyan([%thread]) %boldGreen(%logger{15}) - %msg %n</pattern>
        </encoder>
    </appender>

    <logger name="org.chengzi" level="DEBUG" additivity="false">
        <appender-ref ref="Console"/>
    </logger>


    <!--
      level:用來(lái)設(shè)置打印級(jí)別，大小寫(xiě)無(wú)關(guān)：TRACE, DEBUG, INFO, WARN, ERROR, ALL 和 OFF， 默認(rèn)debug
      <root>可以包含零個(gè)或多個(gè)<appender-ref>元素，標(biāo)識(shí)這個(gè)輸出位置將會(huì)被本日志級(jí)別控制。
      -->
    <root level="DEBUG">
        <appender-ref ref="Console"/>
    </root>
</configuration>

<?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>

    <typeAliases>
        <package name="org.chengzi.pojo"/>
    </typeAliases>
    
    <!--
    environments：配置數(shù)據(jù)庫(kù)連接環(huán)境信息。可以配置多個(gè)environment，通過(guò)default屬性切換不同的environment
    -->
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <!--數(shù)據(jù)庫(kù)連接信息-->
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/blog?useSSL=false"/>
                <property name="username" value="root"/>
                <property name="password" value="abc123"/>
            </dataSource>
        </environment>

        <environment id="test">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <!--數(shù)據(jù)庫(kù)連接信息-->
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/blog?useSSL=false"/>
                <property name="username" value="root"/>
                <property name="password" value="abc123"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
       <!--加載sql映射文件-->
       <mapper resource="StudentMapper.xml"/>
    </mappers>
</configuration>

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="test">
    <select id="selectAll" resultType="org.chengzi.pojo.User">
        select * from student;
    </select>
</mapper>

package org.chengzi.pojo;

public class Student {
    private int id;
    private String name;
    private String gender;

    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 String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", gender='" + gender + '\'' +
                '}';
    }
}

public class MyBatisDemo {

    public static void main(String[] args) throws IOException {
        //1. 加載mybatis的核心配置文件，獲取 SqlSessionFactory
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

        //2. 獲取SqlSession對(duì)象，用它來(lái)執(zhí)行sql
        SqlSession sqlSession = sqlSessionFactory.openSession();
        //3. 執(zhí)行sql
        List<Student> students = sqlSession.selectList("test.selectAll"); //參數(shù)是一個(gè)字符串，該字符串必須是映射配置文件的namespace.id
        System.out.println(students);
        //4. 釋放資源
        sqlSession.close();
    }
}