第十六章回顾SQL99中的连接查询
1)内连接
2)外连接
3)自连接
第十七章回顾hibernate多表开发
1)一对一
2)一对多
3)多对多
第十八章 mybatis一对一映射【学生与身份证】
1)参见<<一对一图示.JPG>>
2)创建students.sql和cards.sql
drop table students; drop table cards; create table cards( id int(5) primary key, num varchar(20) ); create table students( id int(5) primary key, name varchar(10), cid int(5), constraint cid_fk foreign key(cid) references cards(id) ); insert into cards(id,num) values(1,‘111‘); insert into students(id,name,cid) values(1,‘哈哈‘,1); |
3)创建Students.java和Card.java
public class Card { private Integer id; private String num; private Student student; public Card(){} public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getNum() { return num; } public void setNum(String num) { this.num = num; } public Student getStudent() { return student; } public void setStudent(Student student) { this.student = student; } } public class Student { private Integer id; private String name; private Card card; public Student(){} public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Card getCard() { return card; } public void setCard(Card card) { this.card = card; } } |
4)创建StudentMapper.xml和CardMapper.xml
CardMapper.xml
<?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="cardNamespace"> <resultMap type="cn.itcast.javaee.mybatis.one2one.Card" id="cardMap"> <id property="id" column="id" /> <result property="num" column="num" /> </resultMap> </mapper> |
StudentMapper.xml
<?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="studentNamespace"> <resultMap type="cn.itcast.javaee.mybatis.one2one.Student" id="studentMap"> <id property="id" column="id" /> <result property="name" column="name"/> <association property="card" resultMap="cardNamespace.cardMap"/> </resultMap> <select id="findById" parameterType="int" resultMap="studentMap"> select s.id,s.name,c.id,c.num from students s inner join cards c on s.cid = c.id and s.id = #{id} </select> </mapper> |
5)创建StudentCardDao.java
public class StudentCardDao { /** * 查询1号【学生】 */ public Student findById(int id) throws Exception{ SqlSession sqlSession = null; try{ sqlSession = MybatisUtil.getSqlSession(); return sqlSession.selectOne("studentNamespace.findById",id); }catch(Exception e){ e.printStackTrace(); throw e; }finally{ MybatisUtil.closeSqlSession(); } } public static void main(String[] args) throws Exception{ StudentCardDao dao = new StudentCardDao(); Student student = dao.findById(1); System.out.println(student.getId()+":"+student.getName()); System.out.println(student.getCard().getId()+":"+student.getCard().getNum()); } } |
第十九章 mybatis一对多映射【班级与学生】
1)参见<<一对多图示.JPG>>
2)创建grades.sql和students.sql
drop table students; drop table grades; create table grades( gid int(5) primary key, gname varchar(10) ); create table students( sid int(5) primary key, sname varchar(10), sgid int(5), constraint sgid_fk foreign key(sgid) references grades(gid) ); insert into grades(gid,gname) values(1,‘java‘); insert into students(sid,sname,sgid) values(1,‘哈哈‘,1); insert into students(sid,sname,sgid) values(2,‘呵呵‘,1); |
3)创建Grade.java和Student.sql
/** * 班级(单方) * @author AdminTC */ public class Grade { private Integer id; private String name; private List<Student> studentList = new ArrayList<Student>(); public Grade(){} public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public List<Student> getStudentList() { return studentList; } public void setStudentList(List<Student> studentList) { this.studentList = studentList; } } /** * 学生(多方) * @author AdminTC */ public class Student { private Integer id; private String name; private Grade grade; public Student(){} public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Grade getGrade() { return grade; } public void setGrade(Grade grade) { this.grade = grade; } } |
4)创建GradeMapper.xml和StudentMapper.xml
GradeMapper.xml
<?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="gradeNamespace"> <resultMap type="cn.itcast.javaee.mybatis.one2many.Grade" id="gradeMap"> <id property="id" column="gid" /> <result property="name" column="gname"/> <collection property="studentList" resultMap="studentNamespace.studentMap"/> </resultMap> <select id="findGradeByName" parameterType="string" resultMap="gradeMap"> select g.gid,g.gname,s.sid,s.sname from grades g,students s where g.gid = s.sgid and s.sname = #{name} </select> </mapper> |
StudentMapper.xml
<?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="studentNamespace"> <resultMap type="cn.itcast.javaee.mybatis.one2many.Student" id="studentMap"> <id property="id" column="sid" /> <result property="name" column="sname"/> <association property="grade" resultMap="gradeNamespace.gradeMap"/> </resultMap> <select id="findAllByName" parameterType="string" resultMap="studentMap"> select s.sid,s.sname,g.gid,g.gname from grades g,students s where g.gid = s.sgid and g.gname = #{name} </select> </mapper> |
5)创建GradeStudentDao.java
public class GradeStudentDao { /** * 查询java班级有哪些【学生】 */ public List<Student> findAllByName(String name) throws Exception{ SqlSession sqlSession = null; try{ sqlSession = MybatisUtil.getSqlSession(); return sqlSession.selectList("studentNamespace.findAllByName",name); }catch(Exception e){ e.printStackTrace(); throw e; }finally{ MybatisUtil.closeSqlSession(); } } /** * 查询哈哈属于哪个【班级】 */ public Grade findGradeByName(String name) throws Exception{ SqlSession sqlSession = null; try{ sqlSession = MybatisUtil.getSqlSession(); return sqlSession.selectOne("gradeNamespace.findGradeByName",name); }catch(Exception e){ e.printStackTrace(); throw e; }finally{ MybatisUtil.closeSqlSession(); } } public static void main(String[] args) throws Exception{ GradeStudentDao dao = new GradeStudentDao(); List<Student> studentList = dao.findAllByName("java"); for(Student s : studentList){ System.out.println(s.getId()+":"+s.getName()+":"+s.getGrade().getId()+":"+s.getGrade().getName()); } Grade grade = dao.findGradeByName("哈哈"); System.out.println(grade.getId()+":"+grade.getName()); } } |
第二十章 mybatis多对多映射【学生与课程】
1)参见<<多对多图示.JPG>>
2)创建students.sql和courses.sql和middles.sql
drop table middles; drop table students; drop table courses; create table students( sid int(5) primary key, sname varchar(10) ); create table courses( cid int(5) primary key, cname varchar(10) ); create table middles( sid int(5), cid int(5), primary key(sid,cid) ); insert into students(sid,sname) values(1,‘哈哈‘); insert into students(sid,sname) values(2,‘呵呵‘); insert into courses(cid,cname) values(1,‘java‘); insert into courses(cid,cname) values(2,‘net‘); insert into middles(sid,cid) values(1,1); insert into middles(sid,cid) values(1,2); insert into middles(sid,cid) values(2,1); insert into middles(sid,cid) values(2,2); select * from students; select * from courses; select * from middles; |
3)创建Student.java和Course.java
/** * 学生(多方) * @author AdminTC */ public class Student { private Integer id; private String name; private List<Course> courseList = new ArrayList<Course>(); public Student(){} public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public List<Course> getCourseList() { return courseList; } public void setCourseList(List<Course> courseList) { this.courseList = courseList; } } /** * 课程(多方) * @author AdminTC */ public class Course { private Integer id; private String name; private List<Student> studentList = new ArrayList<Student>(); public Course(){} public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public List<Student> getStudentList() { return studentList; } public void setStudentList(List<Student> studentList) { this.studentList = studentList; } } |
4)创建StudentMapper.xml和CourseMapper.xml
StudentMapper.xml
<?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="studentNamespace"> <resultMap type="cn.itcast.javaee.mybatis.many2many.Student" id="studentMap"> <id property="id" column="sid" /> <result property="name" column="sname"/> </resultMap> <select id="findStudentByName" parameterType="string" resultMap="studentMap"> select s.sid,s.sname from students s,middles m,courses c where s.sid = m.sid and m.cid = c.cid and c.cname = #{name} </select> </mapper> |
CourseMapper.xml
<?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="courseNamespace"> <resultMap type="cn.itcast.javaee.mybatis.many2many.Course" id="courseMap"> <id property="id" column="cid" /> <result property="name" column="cname"/> </resultMap> <select id="findCourseByName" parameterType="string" resultMap="courseMap"> select c.cid,c.cname from students s,middles m,courses c where s.sid = m.sid and m.cid = c.cid and s.sname = #{name} </select> </mapper> |
5)创建students.sql和courses.sql和middles.sql
public class StudentCourseDao { /** * 查询哈哈选学的【课程】 */ public List<Course> findCourseByName(String name) throws Exception{ SqlSession sqlSession = null; try{ sqlSession = MybatisUtil.getSqlSession(); return sqlSession.selectList("courseNamespace.findCourseByName",name); }catch(Exception e){ e.printStackTrace(); throw e; }finally{ MybatisUtil.closeSqlSession(); } } /** * 查询java课程有哪些【学生】 */ public List<Student> findStudentByName(String name) throws Exception{ SqlSession sqlSession = null; try{ sqlSession = MybatisUtil.getSqlSession(); return sqlSession.selectList("studentNamespace.findStudentByName",name); }catch(Exception e){ e.printStackTrace(); throw e; }finally{ MybatisUtil.closeSqlSession(); } } public static void main(String[] args) throws Exception{ StudentCourseDao dao = new StudentCourseDao(); //List<Course> courseList = dao.findCourseByName("哈哈"); //for(Course c : courseList){ // System.out.println(c.getId()+":"+c.getName()); //} List<Student> studentList = dao.findStudentByName("java"); for(Student s : studentList){ System.out.println(s.getId()+":"+s.getName()); } } } |
第二十一章 spring + mybatis + mysql/oracle开发
1)创建一个spring-mybatis-mysql这么一个javaweb或java工程
2)导入spring-ioc,spring-aop,spring-transaction,mybatis,c3p0,mysql/oracle相关的jar包和spring整合mybatis的jar包
3)创建students.sql
--mysql create table students( sid int(5) primary key, sname varchar(10), ssal double(8,2) ); |
4)创建Student.java
/** * 学生 * @author AdminTC */ public class Student { private Integer id;//编号 private String name;//姓名 private Double sal;//薪水 public Student(){} public Student(Integer id, String name, Double sal) { this.id = id; this.name = name; this.sal = sal; } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Double getSal() { return sal; } public void setSal(Double sal) { this.sal = sal; } } |
5)创建StudentMapper.xml
<?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="studentNamespace"> <resultMap type="cn.itcast.javaee.mybatis.entity.Student" id="studentMap"> <id property="id" column="sid" /> <result property="name" column="sname"/> <result property="sal" column="ssal"/> </resultMap> <insert id="insert" parameterType="cn.itcast.javaee.mybatis.entity.Student"> insert into students(sid,sname,ssal) values(#{id},#{name},#{sal}) </insert> </mapper> |
6)创建StudentDao.java
public class StudentDao { private SqlSessionFactory sqlSessionFactory; public void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) { this.sqlSessionFactory = sqlSessionFactory; } public void insert(Student student){ SqlSession sqlSession = sqlSessionFactory.openSession(); sqlSession.insert("studentNamespace.insert",student); //int i = 10/0; } public static void main(String[] args) { ApplicationContext ac = new ClassPathXmlApplicationContext(new String[]{"spring.xml"}); StudentDao studentDao = (StudentDao) ac.getBean("studentDaoID"); studentDao.insert(new Student(1,"哈哈",7000D)); } } |
7)在src目录下创建mybatis.xml
<?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> <mappers> <mapper resource="cn/itcast/javaee/mybatis/entity/StudentMapper.xml"/> </mappers> </configuration> |
8)在src目录下创建spring.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd "> <!-- 配置C3P0连接池(即管理数据库连接) --> <bean id="comboPooledDataSourceID" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="com.mysql.jdbc.Driver"/> <property name="jdbcUrl" value="jdbc:mysql://127.0.0.1:3306/mybatis"/> <property name="user" value="root"/> <property name="password" value="root"/> </bean> <!-- 配置SqlSessionFactoryBean(即替代MyBatisUtil工具类的作用) --> <bean id="sqlSessionFactoryBeanID" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="comboPooledDataSourceID"/> <property name="configLocation" value="classpath:mybatis.xml"/> </bean> <!-- 配置事务管理器(即使用JDBC事务管理器) --> <bean id="dataSourceTransactionManagerID" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="comboPooledDataSourceID"/> </bean> <!-- 配置事务通知(即哪些方法需要事务) --> <tx:advice id="tx" transaction-manager="dataSourceTransactionManagerID"> <tx:attributes> <tx:method name="*" propagation="REQUIRED"/> </tx:attributes> </tx:advice> <!-- 配置事务切面(即哪些包中的类需要事务通知) --> <aop:config> <aop:pointcut id="pointcut" expression="execution(* cn.itcast.javaee.mybatis.dao.*.*(..))"/> <aop:advisor advice-ref="tx" pointcut-ref="pointcut" /> </aop:config> <!-- 配置StudentDao类 --> <bean id="studentDaoID" class="cn.itcast.javaee.mybatis.dao.StudentDao"> <property name="sqlSessionFactory" ref="sqlSessionFactoryBeanID"/> </bean> </beans> |
第二十二章 jsp/js/jquery/easyui/json + @springmvc + spring + mybatis + mysql/oracle开发
1) 员工管理系统--增加员工
第二十三章 jdbc访问oracle存储过程和存储函数
1)写一个计算个人所得税的应用
--定义过程 create or replace procedure get_rax(salary in number,rax out number) as --需要交税的钱 bal number; begin bal := salary - 3500; if bal<=1500 then rax := bal * 0.03 - 0; elsif bal<=4500 then rax := bal * 0.1 - 105; elsif bal<=9000 then rax := bal * 0.2 - 555; elsif bal<=35000 then rax := bal * 0.25 - 1005; elsif bal<=55000 then rax := bal * 0.3 - 2755; elsif bal<=80000 then rax := bal * 0.35 - 5505; else rax := bal * 0.45 - 13505; end if; end; / --调用过程 declare --交税 rax number; salary number := &salary; begin get_rax(salary,rax); dbms_output.put_line(salary||‘元工资需要交‘||rax||‘元税‘); end; / |
//Java调用过程 public class TestCallOracleProc { public static void main(String[] args) throws Exception{ String sql = "{call get_rax(?,?)}"; Connection conn = JdbcUtil.getConnection(); CallableStatement cstmt = conn.prepareCall(sql); cstmt.setInt(1,10000); cstmt.registerOutParameter(2,Types.INTEGER); cstmt.execute(); Integer rax = cstmt.getInt(2); System.out.println("10000元需要交" + rax + "元税"); JdbcUtil.close(cstmt); JdbcUtil.close(conn); } } |
查询7788号员工的的姓名,职位,月薪
--定义函数 create or replace function findEmpNameAndJobAndSal(pempno in number,pjob out varchar2,psal out number) return varchar2 as pename emp.ename%type; begin select ename,job,sal into pename,pjob,psal from emp where empno = pempno; return pename; end; / --调用函数 declare pename emp.ename%type; pjob emp.job%type; psal emp.sal%type; begin pename := findEmpNameAndJobAndSal(7788,pjob,psal); dbms_output.put_line(‘7788‘||‘--‘||pename||‘--‘||pjob||‘--‘||psal); end; / |
//Java调用函数 public class TestCallOracleFunc { public static void main(String[] args) throws Exception{ String sql = "{?=call findEmpNameAndJobAndSal(?,?,?)}"; Connection conn = JdbcUtil.getConnection(); CallableStatement cstmt = conn.prepareCall(sql); cstmt.registerOutParameter(1,Types.VARCHAR); cstmt.setInt(2,7788); cstmt.registerOutParameter(3,Types.VARCHAR); cstmt.registerOutParameter(4,Types.INTEGER); cstmt.execute(); String ename = cstmt.getString(1); String job = cstmt.getString(3); Integer sal = cstmt.getInt(4); System.out.println(ename+":"+job+":"+sal); JdbcUtil.close(cstmt); JdbcUtil.close(conn); } } |