mybatis 关联查询实现一对多

场景：最近接到一个项目是查询管理人集合  同时每一个管理人还存在多个出资人   要查询一个管理人列表  每个管理人又包含了出资人列表 采用mybatis关联查询实现返回数据。

实现方式：

1 .在实体中定义包含出资人集合  并创建get  set 方法

public class FundManager extends BaseEntity implements Serializable {
    /** 默认字段，禁止更改 **/
    @Fieldmeta(name = "主键", logflag = 0)
    private String id;

    @Fieldmeta(name = "管理人名称", logflag = 0)
    private String name;

    @Fieldmeta(name = "管理人注册地址", logflag = 0)
    private String reginAdress;

    @Fieldmeta(name = "法定代表人（委派代表）", logflag = 0)
    private String legalName;

    @Fieldmeta(name = "法人是否取得基金从业资格证", logflag = 0)
    private Integer legalFq;

    @Fieldmeta(name = "风控负责人", logflag = 0)
    private String riskName;

    @Fieldmeta(name = "风控负责人是否取得基金从业资格证", logflag = 0)
    private Integer riskFq;

    @Fieldmeta(name = "核心团队", logflag = 0)
    private String keyman;

    @Fieldmeta(name = "驻青岛人员", logflag = 0)
    private String qdman;

    @Fieldmeta(name = "是否在中基协备案", logflag = 0)
    private Integer record;

    @Fieldmeta(name = "累计管理基金数量", logflag = 0)
    private Integer fundNum;

    @Fieldmeta(name = "累计管理基金总规模", logflag = 0)
    private BigDecimal totalFundMoney;

    @Fieldmeta(name = "累计投资项目数量", logflag = 0)
    private Integer investProjectNum;

    @Fieldmeta(name = "累计投资项目总金额", logflag = 0)
    private BigDecimal totalProjectMoney;

    @Fieldmeta(name = "累计退出项目数量", logflag = 0)
    private Integer exitProjectNum;

    @Fieldmeta(name = "实现上市退出及收益率的项目数量", logflag = 0)
    private Integer listProjectNum;

    @Fieldmeta(name = "退出项目的投资总金额", logflag = 0)
    private BigDecimal exitProjectMoney;

    @Fieldmeta(name = "退出项目的总金额", logflag = 0)
    private BigDecimal totalExitMoney;

    @Fieldmeta(name = "曾经投资青岛项目数量", logflag = 0)
    private Integer investQdNum;

    @Fieldmeta(name = "投资青岛项目总金额", logflag = 0)
    private BigDecimal totalQdMoney;

    @Fieldmeta(name = "成功项目1", logflag = 0)
    private String aprojectName;

    @Fieldmeta(name = "回报倍数1", logflag = 0)
    private BigDecimal amultiplier;

    @Fieldmeta(name = "成功项目2", logflag = 0)
    private String bprojectName;

    @Fieldmeta(name = "回报倍数2", logflag = 0)
    private BigDecimal bmultiplier;

    @Fieldmeta(name = "成功项目3", logflag = 0)
    private String cprojectName;

    @Fieldmeta(name = "回报倍数3", logflag = 0)
    private BigDecimal cmultiplier;

    @Fieldmeta(name = "社会信用代码", logflag = 0)
    private String unifiedNumber;

    @Fieldmeta(name = "成立时间", logflag = 0)
    private Date setupDate;

    @Fieldmeta(name = "联系人", logflag = 0)
    private String contacts;

    @Fieldmeta(name = "联系电话", logflag = 0)
    private String contactTel;

    @Fieldmeta(name = "管理人AMAC登记号", logflag = 0)
    private String amacNumber;

    @Fieldmeta(name = "管理人登记时间", logflag = 0)
    private Date recordDate;

    @Fieldmeta(name = "管理公司认缴注册资本", logflag = 0)
    private BigDecimal planAmount;

    @Fieldmeta(name = "管理公司实缴资本", logflag = 0)
    private BigDecimal amount;

    @Fieldmeta(name = "管理员是否新设", logflag = 0)
    private Integer isNew;

    @Fieldmeta(name = "详细介绍", logflag = 0)
    private String information;

    @Fieldmeta(name = "GP是否同基金管理人(是or否)", logflag = 0)
    private Integer managerIsGp;

    @Fieldmeta(name = "是否gp", logflag = 0)
    private Integer gpFlage;

    @Fieldmeta(name="申报id",logflag = 0)
    private String gpNotifyId;

    /** 以下是公共扩展属性（若有较多非共性扩展属性，需定义在子类中） **/
    private List<Investorinfo> investorinfos;

    /** 以下是默认get/set方法，一般情况下禁止更改 **/
    /** 注意： **/
    /** 1，若使用数据字典翻译，建议增加getXXXXValue方法，页面调用使用xXXXXValue **/
    /** 2，若字段用于显示时，存在一些特殊处理逻辑，建议增加getXXXXForView方法，页面调用使用xXXXXForView **/
    public void setId(String id){
        this.id = id;
    }

    public String getId( ){
        return this.id;
    }
    public void setName(String name){
        this.name = name;
    }

    public String getName( ){
        return this.name;
    }
    public void setReginAdress(String reginAdress){
        this.reginAdress = reginAdress;
    }

    public String getReginAdress( ){
        return this.reginAdress;
    }
    public void setLegalName(String legalName){
        this.legalName = legalName;
    }

    public String getLegalName( ){
        return this.legalName;
    }
    public void setLegalFq(Integer legalFq){
        this.legalFq = legalFq;
    }

    public Integer getLegalFq( ){
        return this.legalFq;
    }
    public void setRiskName(String riskName){
        this.riskName = riskName;
    }

    public String getRiskName( ){
        return this.riskName;
    }
    public void setRiskFq(Integer riskFq){
        this.riskFq = riskFq;
    }

    public Integer getRiskFq( ){
        return this.riskFq;
    }
    public void setKeyman(String keyman){
        this.keyman = keyman;
    }

    public String getKeyman( ){
        return this.keyman;
    }
    public void setQdman(String qdman){
        this.qdman = qdman;
    }

    public String getQdman( ){
        return this.qdman;
    }
    public void setRecord(Integer record){
        this.record = record;
    }

    public Integer getRecord( ){
        return this.record;
    }
    public void setFundNum(Integer fundNum){
        this.fundNum = fundNum;
    }

    public Integer getFundNum( ){
        return this.fundNum;
    }
    public void setTotalFundMoney(BigDecimal totalFundMoney){
        this.totalFundMoney = totalFundMoney;
    }

    public BigDecimal getTotalFundMoney( ){
        return this.totalFundMoney;
    }
    public void setInvestProjectNum(Integer investProjectNum){
        this.investProjectNum = investProjectNum;
    }

    public Integer getInvestProjectNum( ){
        return this.investProjectNum;
    }
    public void setTotalProjectMoney(BigDecimal totalProjectMoney){
        this.totalProjectMoney = totalProjectMoney;
    }

    public BigDecimal getTotalProjectMoney( ){
        return this.totalProjectMoney;
    }
    public void setExitProjectNum(Integer exitProjectNum){
        this.exitProjectNum = exitProjectNum;
    }

    public Integer getExitProjectNum( ){
        return this.exitProjectNum;
    }
    public void setListProjectNum(Integer listProjectNum){
        this.listProjectNum = listProjectNum;
    }

    public Integer getListProjectNum( ){
        return this.listProjectNum;
    }
    public void setExitProjectMoney(BigDecimal exitProjectMoney){
        this.exitProjectMoney = exitProjectMoney;
    }

    public BigDecimal getExitProjectMoney( ){
        return this.exitProjectMoney;
    }
    public void setTotalExitMoney(BigDecimal totalExitMoney){
        this.totalExitMoney = totalExitMoney;
    }

    public BigDecimal getTotalExitMoney( ){
        return this.totalExitMoney;
    }
    public void setInvestQdNum(Integer investQdNum){
        this.investQdNum = investQdNum;
    }

    public Integer getInvestQdNum( ){
        return this.investQdNum;
    }
    public void setTotalQdMoney(BigDecimal totalQdMoney){
        this.totalQdMoney = totalQdMoney;
    }

    public BigDecimal getTotalQdMoney( ){
        return this.totalQdMoney;
    }
    public void setAprojectName(String aprojectName){
        this.aprojectName = aprojectName;
    }

    public String getAprojectName( ){
        return this.aprojectName;
    }
    public void setAmultiplier(BigDecimal amultiplier){
        this.amultiplier = amultiplier;
    }

    public BigDecimal getAmultiplier( ){
        return this.amultiplier;
    }
    public void setBprojectName(String bprojectName){
        this.bprojectName = bprojectName;
    }

    public String getBprojectName( ){
        return this.bprojectName;
    }
    public void setBmultiplier(BigDecimal bmultiplier){
        this.bmultiplier = bmultiplier;
    }

    public BigDecimal getBmultiplier( ){
        return this.bmultiplier;
    }
    public void setCprojectName(String cprojectName){
        this.cprojectName = cprojectName;
    }

    public String getCprojectName( ){
        return this.cprojectName;
    }
    public void setCmultiplier(BigDecimal cmultiplier){
        this.cmultiplier = cmultiplier;
    }

    public BigDecimal getCmultiplier( ){
        return this.cmultiplier;
    }
    public void setUnifiedNumber(String unifiedNumber){
        this.unifiedNumber = unifiedNumber;
    }

    public String getUnifiedNumber( ){
        return this.unifiedNumber;
    }
    public void setSetupDate(Date setupDate){
        this.setupDate = setupDate;
    }

    public Date getSetupDate( ){
        return this.setupDate;
    }
    public void setContacts(String contacts){
        this.contacts = contacts;
    }

    public String getContacts( ){
        return this.contacts;
    }
    public void setContactTel(String contactTel){
        this.contactTel = contactTel;
    }

    public String getContactTel( ){
        return this.contactTel;
    }
    public void setAmacNumber(String amacNumber){
        this.amacNumber = amacNumber;
    }

    public String getAmacNumber( ){
        return this.amacNumber;
    }
    public void setRecordDate(Date recordDate){
        this.recordDate = recordDate;
    }

    public Date getRecordDate( ){
        return this.recordDate;
    }
    public void setPlanAmount(BigDecimal planAmount){
        this.planAmount = planAmount;
    }

    public BigDecimal getPlanAmount( ){
        return this.planAmount;
    }
    public void setAmount(BigDecimal amount){
        this.amount = amount;
    }

    public BigDecimal getAmount( ){
        return this.amount;
    }
    public void setIsNew(Integer isNew){
        this.isNew = isNew;
    }

    public Integer getIsNew( ){
        return this.isNew;
    }
    public void setInformation(String information){
        this.information = information;
    }

    public String getInformation( ){
        return this.information;
    }
    public void setManagerIsGp(Integer managerIsGp){
        this.managerIsGp = managerIsGp;
    }

    public Integer getManagerIsGp( ){
        return this.managerIsGp;
    }
    public void setGpFlage(Integer gpFlage){
        this.gpFlage = gpFlage;
    }

    public Integer getGpFlage( ){
        return this.gpFlage;
    }

    public String getGpNotifyId() {
        return gpNotifyId;
    }

    public void setGpNotifyId(String gpNotifyId) {
        this.gpNotifyId = gpNotifyId;
    }

    /** 扩展get/set方法 **/
    public List<Investorinfo> getInvestorinfos() {
        return investorinfos;
    }

    public void setInvestorinfos(List<Investorinfo> investorinfos) {
        this.investorinfos = investorinfos;
    }

}

2. mybatis.xml文件中实现  定义基本查询语句查询管理人集合  返回resultMap 结果集  在resultMap返回结果中进行关联关系映射查询，collection实现一对多查询

其中<id>标签为查询fundManager 的id 在管理时候的别名与关联字短  比如 on t.id=s.id  在collection 标签中通过select 属性来指定关联的查询语句  但是本次我关联的两个

查询分别属于不同的xml文件这时候如何实现在一个mapper.xml 文件中引用另外一个mapper.xml文件的查询语句那 ，采用命名空间加.id属性对应的名方式

fundManagerMapper.xml

<!-- #######【开始】扩展代码区，可*改动。####### -->
    <resultMap id="ResultMapWithInvestor" type="com.qk.gpportal.core.fundmanager.entity.FundManager" extends="BaseResultMap">
            <id property="id" column="id"/>
           <collection property="investorinfos" ofType="com.qk.gpportal.core.investorinfo.entity.Investorinfo" column="id" select="com.qk.gpportal.core.investorinfo.dao.InvestorinfoMapper.getInvestors">
           </collection>
    </resultMap>
    <select id="getFundManagerBygpNotifyId" parameterType="java.lang.String" resultMap="ResultMapWithInvestor">
        select <include refid="Columns"/>
        FROM  g_fund_manager WHERE  gp_notify_id= #{gpNotifyId,jdbcType=VARCHAR}
    </select>
<!-- #######【结束】扩展代码区，可*改动。####### -->

investorinfoMapper.xml  id的名字通过在fundmanagerMapper.xml文件中表空间方式.id名称方式引用   可以实现不同.xml方法之间的引用

  <select id="getInvestors" resultMap="BaseResultMap" parameterType="java.lang.String">
        select  <include refid="Columns"/>
        from g_investorinfo  where fund_manager_id = #{id}
    </select>