Mybatis的学习8 ____模糊查询，分页显示和动态sql编写

1.实验环境：

smbms_bill（账单表）

smbms_provider（供应商表）

 

2.pojo（实体类的编写）

pojo.Bill.java

（注意：实体类中有一个providerName属性，而在 smbms_bill 数据库中没有该字段,其对应的是smbms_provider中的proName字段）

  1 public class Bill {
  2     private Integer id;   //id 
  3     private String billCode; //账单编码 
  4     private String productName; //商品名称 
  5     private String productDesc; //商品描述 
  6     private String productUnit; //商品单位
  7     private BigDecimal productCount; //商品数量 
  8     private BigDecimal totalPrice; //总金额
  9     private Integer isPayment; //是否支付 
 10     private Integer providerId; //供应商ID 
 11     private Integer createdBy; //创建者
 12     private Date creationDate; //创建时间
 13     private Integer modifyBy; //更新者
 14     private Date modifyDate;//更新时间
 15     
 16     private String providerName;//供应商名称
 17     
 18     
 19     public String getProviderName() {
 20         return providerName;
 21     }
 22     public void setProviderName(String providerName) {
 23         this.providerName = providerName;
 24     }
 25     public Integer getId() {
 26         return id;
 27     }
 28     public void setId(Integer id) {
 29         this.id = id;
 30     }
 31     public String getBillCode() {
 32         return billCode;
 33     }
 34     public void setBillCode(String billCode) {
 35         this.billCode = billCode;
 36     }
 37     public String getProductName() {
 38         return productName;
 39     }
 40     public void setProductName(String productName) {
 41         this.productName = productName;
 42     }
 43     public String getProductDesc() {
 44         return productDesc;
 45     }
 46     public void setProductDesc(String productDesc) {
 47         this.productDesc = productDesc;
 48     }
 49     public String getProductUnit() {
 50         return productUnit;
 51     }
 52     public void setProductUnit(String productUnit) {
 53         this.productUnit = productUnit;
 54     }
 55     public BigDecimal getProductCount() {
 56         return productCount;
 57     }
 58     public void setProductCount(BigDecimal productCount) {
 59         this.productCount = productCount;
 60     }
 61     public BigDecimal getTotalPrice() {
 62         return totalPrice;
 63     }
 64     public void setTotalPrice(BigDecimal totalPrice) {
 65         this.totalPrice = totalPrice;
 66     }
 67     public Integer getIsPayment() {
 68         return isPayment;
 69     }
 70     public void setIsPayment(Integer isPayment) {
 71         this.isPayment = isPayment;
 72     }
 73     
 74     public Integer getProviderId() {
 75         return providerId;
 76     }
 77     public void setProviderId(Integer providerId) {
 78         this.providerId = providerId;
 79     }
 80     public Integer getCreatedBy() {
 81         return createdBy;
 82     }
 83     public void setCreatedBy(Integer createdBy) {
 84         this.createdBy = createdBy;
 85     }
 86     public Date getCreationDate() {
 87         return creationDate;
 88     }
 89     public void setCreationDate(Date creationDate) {
 90         this.creationDate = creationDate;
 91     }
 92     public Integer getModifyBy() {
 93         return modifyBy;
 94     }
 95     public void setModifyBy(Integer modifyBy) {
 96         this.modifyBy = modifyBy;
 97     }
 98     public Date getModifyDate() {
 99         return modifyDate;
100     }
101     public void setModifyDate(Date modifyDate) {
102         this.modifyDate = modifyDate;
103     }
104 
105     @Override
106     public String toString() {
107         return "Bill{" +
108                 "id=" + id +
109                 ", billCode='" + billCode + '\'' +
110                 ", productName='" + productName + '\'' +
111                 ", productDesc='" + productDesc + '\'' +
112                 ", productUnit='" + productUnit + '\'' +
113                 ", productCount=" + productCount +
114                 ", totalPrice=" + totalPrice +
115                 ", isPayment=" + isPayment +
116                 ", providerId=" + providerId +
117                 ", createdBy=" + createdBy +
118                 ", creationDate=" + creationDate +
119                 ", modifyBy=" + modifyBy +
120                 ", modifyDate=" + modifyDate +
121                 ", providerName='" + providerName + '\'' +
122                 '}';
123     }
124 }

pojo.Provider.java

public class Provider {
    
    private Integer id;   //id
    private String proCode; //供应商编码
    private String proName; //供应商名称
    private String proDesc; //供应商描述
    private String proContact; //供应商联系人
    private String proPhone; //供应商电话
    private String proAddress; //供应商地址
    private String proFax; //供应商传真
    private Integer createdBy; //创建者
    private Date creationDate; //创建时间
    private Integer modifyBy; //更新者
    private Date modifyDate;//更新时间
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getProCode() {
        return proCode;
    }
    public void setProCode(String proCode) {
        this.proCode = proCode;
    }
    public String getProName() {
        return proName;
    }
    public void setProName(String proName) {
        this.proName = proName;
    }
    public String getProDesc() {
        return proDesc;
    }
    public void setProDesc(String proDesc) {
        this.proDesc = proDesc;
    }
    public String getProContact() {
        return proContact;
    }
    public void setProContact(String proContact) {
        this.proContact = proContact;
    }
    public String getProPhone() {
        return proPhone;
    }
    public void setProPhone(String proPhone) {
        this.proPhone = proPhone;
    }
    public String getProAddress() {
        return proAddress;
    }
    public void setProAddress(String proAddress) {
        this.proAddress = proAddress;
    }
    public String getProFax() {
        return proFax;
    }
    public void setProFax(String proFax) {
        this.proFax = proFax;
    }
    public Integer getCreatedBy() {
        return createdBy;
    }
    public void setCreatedBy(Integer createdBy) {
        this.createdBy = createdBy;
    }
    public Date getCreationDate() {
        return creationDate;
    }
    public void setCreationDate(Date creationDate) {
        this.creationDate = creationDate;
    }
    public Integer getModifyBy() {
        return modifyBy;
    }
    public void setModifyBy(Integer modifyBy) {
        this.modifyBy = modifyBy;
    }
    public Date getModifyDate() {
        return modifyDate;
    }
    public void setModifyDate(Date modifyDate) {
        this.modifyDate = modifyDate;
    }

    @Override
    public String toString() {
        return "Provider{" +
                "id=" + id +
                ", proCode='" + proCode + '\'' +
                ", proName='" + proName + '\'' +
                ", proDesc='" + proDesc + '\'' +
                ", proContact='" + proContact + '\'' +
                ", proPhone='" + proPhone + '\'' +
                ", proAddress='" + proAddress + '\'' +
                ", proFax='" + proFax + '\'' +
                ", createdBy=" + createdBy +
                ", creationDate=" + creationDate +
                ", modifyBy=" + modifyBy +
                ", modifyDate=" + modifyDate +
                '}';
    }
}

需求1：根据用户给的条件查询 满足条件的 Bill 的结果列表，并进行分页显示：

分析：用户可能提供providerName参数，而smbms_bill数据库中没有该字段（实体类中添加providerName属性），存在于smbms_provider表中，所以进行连表查询。

1.BillMapper接口如下：

1  //3.通过条件查询获取Bill的列表(两张表) providerName在bill表中没有该字段
2     List<Bill> getBillList(@Param("providerName") String providerName, @Param("providerId") Integer providerId, @Param("currentPage") Integer currentPage,@Param("pageSize") Integer pageSize);

2.BillMapper.xml文件如下：

<select id="getBillList" resultMap="Res">
        select b.*,p.proName from smbms_bill b,smbms_provider p
        where b.providerId=p.id
        <if test="providerId!=null">
            and b.providerId=#{providerId}
        </if>
        <if test="providerName!=null and providerName!=''">
            and p.proName like CONCAT ('%',#{providerName},'%')
        </if>
        order by providerId asc limit #{currentPage},#{pageSize}
    </select>
    <resultMap id="Res" type="Bill">
        <result property="providerName" column="proName"/>
    </resultMap>

3.测试类：

 1   @Test
 2     public void getBillList(){
 3         SqlSession sqlSession = MybatisUtils.getSqlSession();
 4         BillMapper mapper = sqlSession.getMapper(BillMapper.class);
 5 
 6         int currentPage=1;
 7         int pageSize=2;
 8         int indexStart=(currentPage-1)*pageSize;
 9 
10         List<Bill> bills = mapper.getBillList(null, 8, indexStart, pageSize);
11 
12         for (Bill bill : bills) {
13             System.out.println(bill);
14         }
15     }

需求二：对已有订单进行修改：

分析：bill有很多字段，用户可以进行部分字段属性值的修改操作，此时使用动态sql实现：

1.BillMapper接口的编写：

1  //5.修改订单
2     int modifyBill(Bill bill);

2.BillMapper.xml配置文件的编写：

 <!--最后一个没有逗号~~~~~-->
    <update id="modifyBill" parameterType="Bill">
        update smbms_bill
        <trim prefix="set" prefixOverrides="," suffix="where id=#{id}">
            <if test="billCode!=null">billCode=#{billCode},</if>
            <if test="productName!=null">productName=#{productName},</if>
            <if test="productDesc!=null">productDesc=#{productDesc}</if>
        </trim>
    </update>

3.测试类：

  @Test
    public void modifyBill(){
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        BillMapper mapper = sqlSession.getMapper(BillMapper.class);

        Bill bill1 = new Bill();
        bill1.setId(3);
        bill1.setBillCode("33333333333");
        bill1.setProductName("伸腿瞪眼丸");
        bill1.setProductDesc("爽歪歪");

        int bills = mapper.modifyBill(bill1);

        System.out.println(bills);
    }