1.xml 文件
1-1.xml文件格式
<?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="admin.adminMapper">
</mapper>
1-2.select 语句
<select id="getStudent" parameterType="pd" resultType="pd">
SELECT *
from student
<where>
<if test="s_id!=null and s_id!=''">
stuid=#{s_id}
</if>
<if test="s_name!=null and s_name!=''">
and stuname=#{s_name}
</if>
</where>
</select>
1-3.其它语句 （以 delete 为例）
<delete parameterType="pd" id="deleteTeacherById">
DELETE FROM teacher WHERE
t_id=#{t_id}
</delete>
1-4.模糊查询
2.传入参数类型
package com.ssm.sample.util;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.BiConsumer;
import javax.servlet.http.HttpServletRequest;
@SuppressWarnings("rawtypes")
public class PageData extends HashMap implements Map {
private static final long serialVersionUID = 1L;
Map<Object, Object> map = null;
HttpServletRequest request;
public static void main(String[] args) {
PageData pageData = new PageData();
List<PageData> list = new ArrayList<>();
PageData a=new PageData();
a.put("key", "asdas");
list.add(a);
pageData.put("list", list);
pageData.put("222", "23232");
System.err.println(pageData);
}
public PageData(HttpServletRequest request) {
this.request = request;
Map properties = request.getParameterMap();
Map<Object, Object> returnMap = new HashMap<Object, Object>();
Iterator entries = properties.entrySet().iterator();
Map.Entry entry;
String name = "";
String value = "";
while (entries.hasNext()) {
entry = (Map.Entry) entries.next();
name = (String) entry.getKey();
Object valueObj = entry.getValue();
if (null == valueObj) {
value = "";
} else if (valueObj instanceof String[]) {
value = "";
String[] values = (String[]) valueObj;
for (int i = 0; i < values.length; i++) {
value += values[i] + ",";
}
value = value.substring(0, value.length() - 1);
} else {
value = valueObj.toString();
}
returnMap.put(name, value);
}
map = returnMap;
}
public PageData() {
map = new HashMap<Object, Object>();
}
public Object get(Object key) {
Object obj = null;
if (map.get(key) instanceof Object[]) {
Object[] arr = (Object[]) map.get(key);
obj = request == null ? arr : (request.getParameter((String) key) == null ? arr : arr[0]);
} else {
obj = map.get(key);
}
return obj;
}
/**
* 以安全转换方式获取键值，如果找不到键则返回的值为空
*
* @param key
* @return
*/
public String getString(Object key) {
Object obj = get(key);
return obj == null ? "" : obj.toString();
}
/**
* 以安全转换方式获取键值，如果找不到键则返回的值为null
*/
public String getStringNull(Object key) {
Object obj = get(key);
return obj == null ? null : obj.toString();
}
/**
* 添加键值对
*/
public Object put(Object key, Object value) {
return map.put(key, value);
}
/**
* 移除键
*/
public Object remove(Object key) {
return map.remove(key);
}
/**
* 清空
*/
public void clear() {
map.clear();
}
/**
* 是否包含键
*/
public boolean containsKey(Object key) {
return map.containsKey(key);
}
public Map<Object,Object> getMap(){
return map;
}
/**
* 是否包含值
*/
public boolean containsValue(Object value) {
return map.containsValue(value);
}
public Set entrySet() {
return map.entrySet();
}
public boolean isEmpty() {
return map.isEmpty();
}
public Set<Object> keySet() {
return map.keySet();
}
@SuppressWarnings("unchecked")
public void putAll(Map t) {
map.putAll(t);
}
public int size() {
return map.size();
}
public Collection<Object> values() {
return map.values();
}
/**
* 适用jdk8的方法
*/
@SuppressWarnings("unchecked")
@Override
public void forEach(BiConsumer action) {
this.map.forEach(action);
}
}
3.Service层
1.baseService
package com.ssm.sample.service.base;
import java.util.Properties;
import javax.annotation.Resource;
import org.mybatis.spring.SqlSessionTemplate;
import com.ssm.sample.util.Logger;
public class BaseService {
protected Logger logger = Logger.getLogger(this.getClass());
@Resource(name="sqlSessionTemplate")
protected SqlSessionTemplate sqlSessionTemplate;
@Resource(name = "globalConf")
protected Properties globalConf;
}
2.UserService
package com.ssm.sample.service.user;
import java.util.List;
import org.springframework.stereotype.Service;
import com.ssm.sample.service.base.BaseService;
import com.ssm.sample.util.PageData;
@Service("UserService")
public class UserService extends BaseService {
/*
* 学生
*/
public List<PageData> getStudent(PageData pd) {
return this.sqlSessionTemplate.selectList("user.userMapper.getStudent", pd);
}
}
4.Facade层
1.baseFacade (空的)
2.UserFacade
package com.ssm.sample.facade.user;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.ssm.sample.facade.base.BaseFacade;
import com.ssm.sample.service.user.UserService;
import com.ssm.sample.util.PageData;
@Service("UserFacade")
public class UserFacade extends BaseFacade {
@Autowired
private UserService userservice;
/*
* 获得学生
*/
public List<PageData> getStudent(PageData pd) {
List<PageData> list = this.userservice.getStudent(pd);
return list;
}
}
5.Controller层
/*
* 学生登录
*/
@ResponseBody
@RequestMapping({ "/s_login" })
public Object s_Login() {
PageData pd = this.getPageData();
List<PageData> student = new ArrayList<>();
Map<String, String> map = new HashMap<String, String>();
try {
student = this.userFacade.getStudent(pd);
if (student.size() != 0) {
map.put("check", "true");
} else {
map.put("check", "false");
}
} catch (Exception e) {
e.printStackTrace();
}
return map;
}
