mybasits profile writing
1.configer configuration file
<xml Version = "1.0" encoding = "UTF-8"??>
<DOCTYPE the Configuration!
the PUBLIC "- // mybatis.org//DTD Config 3.0 // EN"
" HTTP: //mybatis.org/dtd/mybatis-3-config.dtd "> ;
<Configuration>
! <- using the log control Mybaits ->
<Settings>
<Setting name =" logImpl "value =" LOG4J "/>
</ Settings>
<Environments default = "default"> <-! define all database links, and specify which data source ->
<Environment the above mentioned id = "default"> <-! defined data source name - >
<the transactionManager type = "the JDBC" /> <-! submission of transaction types ->
<type the dataSource = "the POOLED"> <-! define a data source,Connection database connection pooling mode ->
<Property name = "Driver" value = "com.mysql.cj.jdbc.Driver" />
<Property name = "url" value = "jdbc: MySQL: //127.0.0.1:? 3306 / test4012 characterEncoding = utf8 & serverTimezone = GMT" />
<Property name = "username" value = "root" />
<Property name = "password" value = "root" />
</ dataSource>
</ Environment>
</ Environments>
<-! loaded database links when loading sql maps ->
<mappers>
<Resource Mapper = "COM / POJO /usermapper-4012.xml "/>
<by mappers>
</ configuration>
2.mapper configuration file
(1) resultType return value type
(2) pramatetertype parameters are passed
<? xml version =" 1.0 " encoding =" UTF -8 ">?
<DOCTYPE Mapper!
the PUBLIC" - // mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">;
<mapper namespace = "com.service.IUserDao4012"> <-! interface address ->
<! - represents a declaration package name for the database operation ->
<! - The method of operating a database statement ->
<! - the entire contents of the query process ->
<SELECT ID = "the SelectAll" the resultType = "com.pojo.User4012">
the SELECT * the FROM table4012
limit offset # {}, {#} pageSize
</ SELECT>
<! - - insertion ->
<iNSERT ID = "InsertUser" the parameterType = "com.pojo.User4012">
iNSERT INTO table4012 (ID, username, Number, mybasits, Android, JavaEE) values (ID # {}, {#} username , Number # {}, {#} mybasits, Android # {}, {#} JavaEE)
</ INSERT>
<Delete ID = "DeleteUser" the parameterType = "com.pojo.User4012">
Delete from table4012 ID = # {WHERE ** }
</delete>
<update id="UpdateUser" parameterType="com.pojo.User4012">
update table4012 set username=#{username},number =#{number},mybasits=#{mybasits},android=#{android},javaee=#{javaee} where id=#{id}
</update>
<select id="findcount" parameterType="com.pojo.PageWays">
SELECT count () from table4012
</select>
<select id="findpage" parameterType="com.pojo.PageWays">
SELECT * from table4012
</select>
</mapper>
3.util类配置
package com.SelfStudy.util;
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 java.io.InputStream;
public class Util {
private static SqlSessionFactory build;//定义一个对象
static {
String s="mybatis.config.xml";//加载config文件
InputStream inputStream=null;//输入输出流
try {
inputStream= Resources.getResourceAsStream(s);
build=new SqlSessionFactoryBuilder().build(inputStream);
}
catch (Exception e){
e.printStackTrace();
}
finally {
try {
if ( inputStream !=null){
inputStream.close();
}
}catch (Exception e){
e.printStackTrace();
}
}
}
public static SqlSession getSession(){
return build.openSession();
}
}
4.log4j.properties文件配置
log4j.appender.console =org.apache.log4j.ConsoleAppender
log4j.appender.console.Target =System.out
log4j.appender.console.layout =org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern =[%-5p][%d{yyyy-MM-dd HH:mm:ss}] %c %L %m%n
\u914D\u7F6E\u6839
Debug = Log4j.rootLogger, Console
## log4j.logger.com.mapper.StudentMapper = Debug, Console
four dynamic sql
using tag 1.if set
the Select from Table
IF (Test = "name! = null and name! = ' ' ") {
# {ID}
}
If each of the database to add a statement later added,
IF (Test =" name! = null and name! =' ' ") {
#} {ID,
}
using the tag 2.where
SELECT from Table
<WHERE>
IF (Test = "name! = null and name! = ''") {
name = # {name}
}
if add a database statement for each one behind added,
IF (Test = "ID! = ID and null! = '' ") {
ID = # {ID}
}
</ WHERE>
using 3.choose when tag
<WHERE>
<the Choose>
<when test="name!=null and name!=''">
and name=#{name}
</when>
<when></when>
</choose>
</where>
- set标签的使用
uddate Table
set id=#{id}
<where>
<if></if>
</where> - Use trim tag
<Update ID = "UPD" the parameterType = "Teacher">
Update Teacher
<trim prefix = "SET" suffixOverrides = ",">
name = # {name}, Age = # {Age},
</ trim>
WHERE ID = # {ID}
</ Update>
prefix = "be added in front of"
prefixOverrides = "be removed earlier"
suffix = "add back"
suffixOverrides = "be removed later in"
key: sequential execution prior removal then add - bind标签
<bind nam="nam" valus="'%'+nam+'%'"></bind>
slct * from tabl wr nam lik #{nam} - foreach (collection query, add)
<the foreach collecation = "" Open = "" Close = "" Item = "">
INSERT INTO Table () valuse
<IF Test = "">
# {},
</ IF>
</ the foreach >
Collection: incoming parameter type
open: open
close: Close ways
item: item - selectKey using (a property of a record on the query)
<INSERT>
INSERT Table valuse ()
<selectKey keyProperty = "" resultType = "" Order = "" keycolum = ""> </ selectKey>
SELECT last_insert_name ()
</ INSERT >
keypropert is the name of the attribute query
resulttype XM is www.fx61.com/brokerlist/xm.html agent for the return type, the query result is the return type of
order execution order
keycolum: attribute database corresponding
plurality of query methods using
1. fuzzy query
SELECT from Table WHERE name = # {name}
[. 1] when the correct query
the SelectAll ( "Ko%%");
[2] in the sql statement corrected
using concat function
SELECT from Table WHERE
ID = concat ( '%', # { id}, '%') - Combined multi-table queries
(1) Configuration mapper class file
<! - First, the encapsulated contents of the query ->
<The resultMap ID = "SelectTogether01" type = "com.SelfStudy.pojo.PeopleWithDatil"> // package connection class properties, mainly the main class attribute
<ID property = "detailID" column = "ID"> </ ID>
<Result property = "address" column = "address"> </ Result>
<Result property = "Country" column = "Country"> </ Result>
<Property Result = "City" = column "City"> </ Result>
<Property association = "PeopleDatil" the javaType = "com.SelfStudy.pojo.People"> // association with the package All properties subclass
<property ID = "detailID" column = "ID"> </ ID>
<property Result = "name" column = "name"></result>
<result property="phone" column="phone"></result>
</association>
</resultMap>
<select id="SelectTogether" resultMap="SelectTogether01">
SELECT * FROM people, peopledatil // joint inquiry, dynamic SQL
<WHERE>
people.id= Peopledatil.id
</ WHERE>
</ SELECT>
(2) Test Test class br /> @ org.junit.Test
public void TestTogether () {
the session = Util.getSession the SqlSession ();
peopleMapperDao peopleMapperDao = session.getMapper (PeopleMapperDao.class);
peopleMapperDao.SelectTogether ();
List <People> List = null;
List peopleMapperDao.SelectTogether = ();
System.out.println (List );
}
3. one joint inquiry
configuration class files
Package Penalty for com.pojo;
public class Student {
Private String name;
Private Integer id;
Private Integer tid; // id and teachers in the dependent
private String address;
City String Private;
// a teacher student corresponding to a
private Teacher teacher; // query the teacher student
public String getName () {
return name;
}
public void the setName (String name) {
this.name = name;
}
public Integer getId () {
return ID;
}
public void the setId (Integer ID) {
this.id ID =;
}
public gettid Integer () {
return TID;
}
public void setTid (Integer TID) {
this.tid TID =;
}
public String getAddress () {
return address;
}
public void the setAddress (String address) {
this.address = address;
}
public String getCity () {
return City;
}
public void setCity(String city) {
this.city = city;
}
public Teacher getTeacher() {
return teacher;
}
public void setTeacher(Teacher teacher) {
this.teacher = teacher;
}
public Student(String name, Integer id, Integer tid, String address, String city, Teacher teacher) {
this.name = name;
this.id = id;
this.tid = tid;
this.address = address;
this.city = city;
this.teacher = teacher;
}
public Student() { }br/>@Override
public String toString() {
return "Student{" +
"name='" + name + '\'' +
", id=" + id +
", tid=" + tid +
", address='" + address + '\'' +
", city='" + city + '\'' +
", teacher=" + teacher +
'}';
}
}
接口配置
package com.service;
import com.pojo.Student;
import java.util.List;
public interface StudentDao {
public List<Student> Selectall();
public List<Student> SelectByid(Integer id);
//查询所有学生
public List<Student> SelectAllStudent();
public List<Student> selct01();
}
mapper文件配置
<?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="com.service.StudentDao">
<resultMap id="map" type="com.pojo.Student">
<id column="id" property="id"></id>
<result property="name" column="name"></result>
<result property="address" column="address"></result>
<result property="city" column="city"></result>
<result property="tid" column="tid"></result>
<association property="teacher" column="tid" select="com.service.TeacherDao.SelectByid"></association>
</resultMap>
<!--联合查询-->
<select id="selct01" resultType="com.pojo.Student">
SELECT s.name, s.id ,s.tid ,s.address , s.city ,t.name , school ,age , sex,t.id
FROM student s LEFT JOIN teacher t on
s.tid=t.id
</select>
4.多对一联合查询
<resultMap id="map01" type="com.pojo.Teacher">
<id property="id1" column="id1" ></id>
<result column="name1" property="name1"></result>
<result column="school" property="school"></result>
<result column="age" property="age"></result>
<result column="sex" property="sex"></result>
<collection property="students" ofType="com.pojo.Student">
<id column="id" property="id"></id>
<result column="name" property="name"></result>
<result column="tid" property="tid"></result>
<result column="address" property="address"></result>
<result column="city" property="city"></result>
</collection>
</resultMap> - 多对多的联合查询
实体类的配置
package com.pojo;
import java.util.Date;
import java.util.List;
public class Writer {
private String name;
private Integer id;
private Integer age;
private String sex;
private String book;
private Date birthday;
//查询作者里面包含作品
private List<Works> works;
public List<Works> getWorks() {
return works;
}
public void setWorks(List<Works> works) {
this.works = works;
}
public Writer(List<Works> works) {
this.works = works;br/>}
@Override
public String toString() {
return "Writer{" +
"name='" + name + '\'' +
", id=" + id +
", age=" + age +
", sex='" + sex + '\'' +
", book='" + book + '\'' +
", birthday=" + birthday +
", works=" + works +
'}';
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getBook() {
return book;
}
public void setBook(String book) {
this.book = book;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public Writer(String name, Integer id, Integer age, String sex, String book, Date birthday) {
this.name = name;
this.id = id;
this.age = age;
this.sex = sex;
this.book = book;
this.birthday = birthday;
}
public Writer() { }
}
mapper文件配置
<?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="com.service.WriterDao">
<!--所有作者-->
<select id="SelectAllWriter" resultType="com.pojo.Writer">
select from writer w
</select>
<select id="SelectWriterByid" resultType="com.pojo.Writer">
select from writer w
<where>
id=#{id}
</where>
</select>
<resultMap id="map01" type="com.pojo.Writer">
<id property="id" column="id"></id>
<result column="name" property="name"></result>
<result column="age" property="age"></result>
<result column="sex" property="sex"></result>
<result column="book" property="book"></result>
<result column="birthday" property="birthday"></result>
<collection property="works" ofType="com.pojo.Works">
<id property="book_id" column="book_id"></id>
<id property="book_name" column="book_name"></id>
<id property="book_press" column="book_press"></id>
<id property="press_date" column="press_date"></id>
</collection>
</resultMap>
<select id="SelectAllWriterAndWorks" resultMap="map01">
SELECT w.age,w.birthday,w.book,w.id,w.name,w.sex ,o.book_id,o.book_press,o.press_date,o.book_name
FROM writer w LEFT JOIN information i ON w.id=i.writer_idLEFT JOIN works o ON o.book_id=i.works_idbr/></select>
</mapper>
注解方式配置
@Results(value={
@Result(id=true,column="",property=""),br/>@Result(column="",property=""),
@Result(column="",property=""),br/>@Result(column="",property=""),
@Result(column="",property=""),br/>@Result(column="",property=""),
@Result(column="",property=""), @Result(column="tid",property="works",many=@Many(Select="com.service.iuserdao.workByid") ),br/>})
@Select(".......")
java导入Excel表格 - Import package
<dependency>
<the groupId> org.apache.poi </ the groupId>
<the artifactId> POI </ the artifactId>
<Version> 3.17 </ Version>
</ dependency>
<-! Https://mvnrepository.com/artifact / Commons-IO / IO-Commons ->
<dependency>
<the groupId> Commons-IO </ the groupId>
<the artifactId> Commons-IO </ the artifactId>
<Version> 2.4 </ Version>
</ dependency>
// import dependencies
2. the method of constructing
public class ImportExcel {
methods excel file // import
public void ReadExcel (file file) {
List List = new new the ArrayList <String> <> ();
// incoming path. 1 Excel file to be imported.
the try {
// 2.Read file contents
HSSFWorkbook workbook = new HSSFWorkbook (FileUtils.openInputStream ( file));
// read sheet 3 page document, Excel sheet is in each table, the sheet is workboo page.
HSSFSheet sheet = workbook.getSheetAt (0);
// 4 to start reading the table of contents.
Int the StartLine = 0; // start line number of rows, i.e. from 0 to the last row
int endline = sheet.getLastRowNum () + 1 ; // the last row in the table d
// through each row
Map <Integer, Map <Integer, Map the HashMap >> = new new Object <> ();
// a first row, first column, the value
// iterate row
for (int. 1 = A; A <endline; A ++) {
HSSFRow HSSFRow = sheet.getRow (A) ;
// traversing column
// write a set value and rank
the Map <Integer, Object> new new Result = the HashMap <> ();
int endcell hssfRow.getLastCellNum = ();
for (int J = 0; J <endcell; J ++ ) {
result.put (J, hssfRow.getCell (J)); // number of rows with columns to acquire
}
map.put (A, Result);
}
List <People> = new new List1 the ArrayList <> ();
for (Integer xxx:map.keySet()){
System.out.print(map.get(xxx).get(0));
System.out.print(map.get(xxx).get(1));
System.out.print(map.get(xxx).get(2));
System.out.print(map.get(xxx).get(3));
People people=new People();
people.setName(String.valueOf(map.get(xxx).get(0)));
String java=String.valueOf(map.get(xxx).get(1));
Integer java1=Integer.parseInt(java.substring(0, java.indexOf(".")));
people.setJava(java1);
String mybas=String.valueOf(map.get(xxx).get(2));
Integer mybas1=Integer.parseInt(mybas.substring(0, mybas.indexOf(".")));
people.setMybas(mybas1);
String androi=String.valueOf(map.get(xxx).get(3));
Integer androi1=Integer.parseInt(androi.substring(0, androi.indexOf(".")));
people.setAndroi(androi1);
list1.add(people);
}
SqlSession session= Util.getSession();
PeopleMapperDao peopleMapperDao=session.getMapper(PeopleMapperDao.class);
peopleMapperDao.ExcelInsert(list1);
session.commit();
}
catch (Exception e){
e.printStackTrace();
}
}
} - The method calls br /> @ org.junit.Test
public void TestExcel () {
ImportExcel new new ImportExcel AAA = ();
File File = new new File ( "C: / the Users / Lenovo / Desktop / Study / SSM notes /test4012.xls" );
aaa.ReadExcel (File);
}