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  • MyBatis和elementui中的高级查询和分页

    前台

    我们需要发送请求和带入参数

     

     有了这两个属性过后需要在data中添加

    这个属性是和方法平级的

     

     

     整个页面

    <template>
        <section>
            <!--工具条-->
            <el-col :span="24" class="toolbar" style="padding-bottom: 0px;">
                <el-form :inline="true" :model="filters">
                    <el-form-item>
                        <el-input v-model="filters.keywords" placeholder="关键字"></el-input>
                    </el-form-item>
                    <el-form-item>
                        <el-button type="primary" v-on:click="getEmployees">查询</el-button>
                    </el-form-item>
                    <el-form-item>
                        <el-button type="primary" @click="handleAdd">新增</el-button>
                    </el-form-item>
                </el-form>
            </el-col>
    
            <!--列表-->
            <el-table :data="employees" highlight-current-row v-loading="listLoading" @selection-change="selsChange" style=" 100%;">
                <el-table-column type="selection" width="55">
                </el-table-column>
                <el-table-column prop="id" width="60" label="ID">
                </el-table-column>
                <el-table-column prop="username" label="姓名" width="120" sortable>
                </el-table-column>
                <el-table-column prop="sn" label="员工编号" width="80" sortable>
                </el-table-column>
                <el-table-column prop="password" label="密码" width="280" sortable>
                </el-table-column>
                <el-table-column prop="headimg" label="头像" width="180" sortable>
                </el-table-column>
                <el-table-column prop="phone" label="电话" width="180" sortable>
                </el-table-column>
                <el-table-column prop="department" label="部门" width="180" sortable>
                </el-table-column>
                <el-table-column label="操作" width="150">
                    <template scope="scope">
                        <el-button size="small" @click="handleEdit(scope.$index, scope.row)">编辑</el-button>
                        <el-button type="danger" size="small" @click="handleDel(scope.$index, scope.row)">删除</el-button>
                    </template>
                </el-table-column>
            </el-table>
    
            <!--工具条
            page-size为每页显示的条数-->
            <el-col :span="24" class="toolbar">
                <el-button type="danger" @click="batchRemove" :disabled="this.sels.length===0">批量删除</el-button>
                <el-pagination layout="prev, pager, next" @current-change="handleCurrentChange" :page-size="pageSize" :total="total" style="float:right;">
                </el-pagination>
            </el-col>
    
            <!--编辑界面-->
            <el-dialog title="编辑" v-model="editFormVisible" :close-on-click-modal="false">
                <el-form :model="editForm" label-width="80px" :rules="editFormRules" ref="editForm">
                    <el-form-item label="姓名" prop="username">
                        <el-input v-model="editForm.username" auto-complete="off"></el-input>
                    </el-form-item>
                </el-form>
                <div slot="footer" class="dialog-footer">
                    <el-button @click.native="editFormVisible = false">取消</el-button>
                    <el-button type="primary" @click.native="editSubmit" :loading="editLoading">提交</el-button>
                </div>
            </el-dialog>
    
            <!--新增界面-->
            <el-dialog title="新增" v-model="addFormVisible" :close-on-click-modal="false">
                <el-form :model="addForm" label-width="80px" :rules="addFormRules" ref="addForm">
                    <el-form-item label="姓名" prop="username">
                        <el-input v-model="addForm.username" auto-complete="off"></el-input>
                    </el-form-item>
                </el-form>
                <div slot="footer" class="dialog-footer">
                    <el-button @click.native="addFormVisible = false">取消</el-button>
                    <el-button type="primary" @click.native="addSubmit" :loading="addLoading">提交</el-button>
                </div>
            </el-dialog>
        </section>
    </template>
    
    <script>
        import util from '../../common/js/util'
        //import NProgress from 'nprogress'
        import { getUserListPage, removeUser, batchRemoveUser, editUser, addUser } from '../../api/api';
    
        export default {
            data() {
                return {
                    filters: {
                        keywords: '',
    
                    },
                    employees: [],
                    total: 0,
                    page: 1,
                    pageSize:5,
                    listLoading: false,
                    sels: [],//列表选中列
    
                    editFormVisible: false,//编辑界面是否显示
                    editLoading: false,
                    editFormRules: {
                        name: [
                            { required: true, message: '请输入姓名', trigger: 'blur' }
                        ]
                    },
                    //编辑界面数据
                    editForm: {
                        username: '',
                    },
    
                    addFormVisible: false,//新增界面是否显示
                    addLoading: false,
                    addFormRules: {
                        name: [
                            { required: true, message: '请输入姓名', trigger: 'blur' }
                        ]
                    },
                    //新增界面数据
                    addForm: {
                        username: '',
                    }
    
                }
            },
            methods: {
                //性别显示转换
                formatSex: function (row, column) {
                    return row.sex == 1 ? '男' : row.sex == 0 ? '女' : '未知';
                },
                handleCurrentChange(val) {
                    this.page = val;
                    this.getEmployees();
                },
                //获取用户列表
                getEmployees() {
                    let para = {
                        page: this.page,
                        pageSize:this.pageSize,
                        keywords: this.filters.keywords
                    };
                    this.listLoading = true;
                    //NProgress.start();
                    //getUserListPage(para)
                    this.$http.patch("/employee/query",para).then((res) => {
                        this.total=res.data.total;
                        this.employees = res.data.rows;
                        this.listLoading=false;
                        //NProgress.done();
                    });
                },
                //删除
                handleDel: function (index, row) {
                    this.$confirm('确认删除该记录吗?', '提示', {
                        type: 'warning'
                    }).then(() => {
                        this.listLoading = true;
                        //NProgress.start();
                        let para = { id: row.id };
                        //console.log(row.id);
                        this.$http.delete('/employee/delete/'+para.id).then((res) => {
                            this.listLoading = false;
                            //NProgress.done();
                            this.$message({
                                message: '删除成功',
                                type: 'success'
                            });
                            this.getEmployees();
                        });
                    }).catch(() => {
                        this.$message({
                            message: '删除失败',
                            type: 'error'
                        });
                    });
                },
                //显示编辑界面
                handleEdit: function (index, row) {
                    this.editFormVisible = true;
                    this.editForm = Object.assign({}, row);
                },
                //显示新增界面
                handleAdd: function () {
                    this.addFormVisible = true;
                    this.addForm = {
                        username:''
                    };
                },
                //编辑
                editSubmit: function () {
                    this.$refs.editForm.validate((valid) => {
                        if (valid) {
                            this.$confirm('确认提交吗?', '提示', {}).then(() => {
                                this.editLoading = true;
                                //NProgress.start();
                                let para = Object.assign({}, this.editForm);
                                // para.birth = (!para.birth || para.birth == '') ? '' : util.formatDate.format(new Date(para.birth), 'yyyy-MM-dd');
                                this.$http.put("/employee/update",para).then((res) => {
                                    this.editLoading = false;
                                    //NProgress.done();
                                    this.$message({
                                        message: '提交成功',
                                        type: 'success'
                                    });
                                    this.$refs['editForm'].resetFields();
                                    this.editFormVisible = false;
                                    this.getEmployees();
                                });
                            });
                        }
                    });
                },
                //新增
                addSubmit: function () {
                    this.$refs.addForm.validate((valid) => {
                        if (valid) {
                            this.$confirm('确认提交吗?', '提示', {}).then(() => {
                                this.addLoading = true;
                                //NProgress.start();
                                let para = Object.assign({}, this.addForm);
                                console.log(para);
                                // para.birth = (!para.birth || para.birth == '') ? '' : util.formatDate.format(new Date(para.birth), 'yyyy-MM-dd');
                                this.$http.post("/employee/add",para).then((res) => {
                                    this.addLoading = false;
                                    //NProgress.done();
                                    this.$message({
                                        message: '提交成功',
                                        type: 'success'
                                    });
                                    this.$refs['addForm'].resetFields();
                                    this.addFormVisible = false;
                                    this.getEmployees();
                                });
                            });
                        }
                    });
                },
                selsChange: function (sels) {
                    this.sels = sels;
                },
                //批量删除
                batchRemove: function () {
                    var ids = this.sels.map(item => item.id).toString();
                    this.$confirm('确认删除选中记录吗?', '提示', {
                        type: 'warning'
                    }).then(() => {
                        this.listLoading = true;
                        //NProgress.start();
                        let para = { ids: ids };
                        batchRemoveUser(para).then((res) => {
                            this.listLoading = false;
                            //NProgress.done();
                            this.$message({
                                message: '删除成功',
                                type: 'success'
                            });
                            this.getEmployees();
                        });
                    }).catch(() => {
    
                    });
                }
            },
            mounted() {
                this.getEmployees();
            }
        }
        function pagination(index,size,list){
            return list.slice((index-1)*size,index*size);
        }
    </script>
    
    <style scoped>
    
    </style>
    View Code

    后台web

    首先需要一个返回值

    PageList

    package cn.jiedada;
    
    import java.util.List;
    
    public class PageList<T> {
        private Long total;
        private List<T> rows;
    
        public Long getTotal() {
            return total;
        }
    
        public void setTotal(Long total) {
            this.total = total;
        }
    
        public List<T> getRows() {
            return rows;
        }
    
        public void setRows(List<T> rows) {
            this.rows = rows;
        }
    
        public PageList(Long total, List<T> rows) {
            this.total = total;
            this.rows = rows;
        }
    
        public PageList() {
        }
    }
    View Code

    和一个接收参数的类

    EmployeeQuery

    public class EmployeeQuery extends BasicQuery {
    }
    View Code

    BasicQuery

    package cn.jiedada.query;
    
    public class BasicQuery {
        private Long page;
        //默认为每页10张数据
        private Long pageSize=10L;
        //高级查询的关键字
        private String keywords;
    
        public String getKeywords() {
            return keywords;
        }
    
        public void setKeywords(String keywords) {
            this.keywords = keywords;
        }
    
        public Long getPageSize() {
            return pageSize;
        }
    
        public void setPageSize(Long pageSize) {
            this.pageSize = pageSize;
        }
    
        public Long getPage() {
            return page;
        }
    
        public void setPage(Long page) {
            this.page = page;
        }
        //设置每页开始的页数,limit start,通过get可以直接获得#{start}
        public Long getStart(){
            return (this.page-1)*pageSize;
        }
    }
    View Code

    web

    @RequestMapping(value = "/query",method = RequestMethod.PATCH)
        @ResponseBody
        //@RequestBody才能把前台的json转为后台的数据
        public PageList<Employee> query(@RequestBody EmployeeQuery employeeQuery){
            return employeeService.query(employeeQuery);
        }
    View Code

    后台service

    因为每个页面都需要使用分页和高级查询所以我们在父类中写入

    IBasicService

    package cn.jiedada.service;
    
    import cn.jiedada.PageList;
    import cn.jiedada.query.BasicQuery;
    
    import java.io.Serializable;
    import java.util.List;
    
    public interface IBasicService<T> {
        void save(T t);
        void delete(Serializable id);
        void update(T t);
        List<T> findAll();
        T findOne(Serializable id);
    
        PageList<T> query(BasicQuery basicQuery);
    }
    View Code

    BasicServiceImpl

    package cn.jiedada.service.impl;
    
    import cn.jiedada.PageList;
    import cn.jiedada.mapper.BasicMapper;
    import cn.jiedada.query.BasicQuery;
    import cn.jiedada.service.IBasicService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.transaction.annotation.Propagation;
    import org.springframework.transaction.annotation.Transactional;
    
    import java.io.Serializable;
    import java.util.List;
    @Transactional(propagation = Propagation.SUPPORTS,readOnly = true)
    public class BasicServiceImpl<T> implements IBasicService<T> {
        @Autowired
        private BasicMapper<T> basicMapper;
        @Override
        @Transactional
        public void save(T t) {
            basicMapper.save(t);
        }
    
        @Override
        @Transactional
        public void delete(Serializable id) {
            basicMapper.delete(id);
        }
    
        @Override
        @Transactional
        public void update(T t) {
            basicMapper.update(t);
        }
    
        @Override
        public List<T> findAll() {
            return basicMapper.findAll();
        }
    
        @Override
        public T findOne(Serializable id) {
            return basicMapper.findOne(id);
        }
    
        @Override
        public PageList<T> query(BasicQuery basicQuery) {
            //  通过Mapper查询总数
            Long total = basicMapper.querryCount(basicQuery);
            //查询当前页数据
            List<T> rows = basicMapper.queryData(basicQuery);
            //通过构造方法返回数据中的所有值
            return new PageList<T>(total,rows);
        }
    }
    View Code

    后台mapper

    BasicMapper

    package cn.jiedada.mapper;
    
    import cn.jiedada.query.BasicQuery;
    
    import java.io.Serializable;
    import java.util.List;
    
    public interface BasicMapper<T> {
        void save(T t);
        void delete(Serializable id);
        void update(T t);
        List<T> findAll();
        T findOne(Serializable id);
        //查询总页数
        Long querryCount(BasicQuery basicQuery);
        //查询分页1的所有数据
        List<T> queryData(BasicQuery basicQuery);
    }
    View Code

    后台mapper.xml

    通过继承和实现EmployeeMapper和EmployeeService也有我们的东西了,只需要实现Mapper中的方法我们就可以完成了

    在其中添加

    <!--查询总页数
        记住需要添加where条件
        -->
        <select id="querryCount" parameterType="employeeQuery" resultType="long">
            select count(id) from t_employee
            <where>
                <include refid="sqlWhere"></include>
            </where>
        </select>
        <!--查询pageList-->
        <select id="queryData" parameterType="employeeQuery" resultType="employee">
            select * from t_employee
            <where>
                <include refid="sqlWhere"></include>
            </where>
            LIMIT #{start},#{pageSize}
        </select>
        <!--高级查询,判断是否传入来了keywords-->
        <sql id="sqlWhere">
            <if test="keywords!=null and keywords!=''">
                and username like concat('%',#{keywords},'%')
            </if>
        </sql>
    View Code
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  • 原文地址:https://www.cnblogs.com/xiaoruirui/p/11832652.html
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