android多条件查询数据,Android GreenDao 条件查询问题
使用GreenDao保存了全國城市的屬性(名字，代碼,省份等等),保存可以成功，無條件查詢全部數據時可以成功:
private List queryCitiesInfo(){
List cityInfos = mCityQUery.list();
for (int i = 0; i < cityInfos.size(); i++) {
Log.d(TAG,"所有的城市CountryEn"+cityInfos.get(i).getCountryEn());
}
return cityInfos;
}
但是使用條件查詢，時數據為0，不知道哪里出錯了，對了下屬性，沒知道原因：
//這個方法查詢的數據為0
private void queryCitiesByLeader(){
mCityInfoDao = nDaoSession.getCityInfoDao();
mCityQUery = mCityInfoDao.queryBuilder().orderAsc(CityInfoDao.Properties.Id).build();
List cityInfos = mCityInfoDao.queryBuilder().where(CityInfoDao.Properties.CountryEn.eq("China")).orderAsc(CityInfoDao.Properties.Id).list();
for (int i = 0; i < cityInfos.size(); i++) {
Log.d(TAG,"條件查詢城市名稱" + cityInfos.get(i).getCityEn());
}
}
@Entity
public class CityInfo {
@Id
private Long id;
private String cityEn;
private String cityZh;
private String countryCode;
private String countryEn;
private String countryZh;
private String provinceEn;
private String provinceZh;
private String leaderEn;
private String leaderZh;
private String lat;
private String lon;
@Generated(hash = 69148619)
public CityInfo(Long id, String cityEn, String cityZh, String countryCode,
String countryEn, String countryZh, String provinceEn,
String provinceZh, String leaderEn, String leaderZh, String lat,
String lon) {
this.id = id;
this.cityEn = cityEn;
this.cityZh = cityZh;
this.countryCode = countryCode;
this.countryEn = countryEn;
this.countryZh = countryZh;
this.provinceEn = provinceEn;
this.provinceZh = provinceZh;
this.leaderEn = leaderEn;
this.leaderZh = leaderZh;
this.lat = lat;
this.lon = lon;
}
@Generated(hash = 300452937)
public CityInfo() {
}
public Long getId() {
return this.id;
}
public void setId(Long id) {
this.id = id;
}
public String getCityEn() {
return this.cityEn;
}
public void setCityEn(String cityEn) {
this.cityEn = cityEn;
}
public String getCityZh() {
return this.cityZh;
}
public void setCityZh(String cityZh) {
this.cityZh = cityZh;
}
public String getCountryCode() {
return this.countryCode;
}
public void setCountryCode(String countryCode) {
this.countryCode = countryCode;
}
public String getCountryEn() {
return this.countryEn;
}
public void setCountryEn(String countryEn) {
this.countryEn = countryEn;
}
public String getCountryZh() {
return this.countryZh;
}
public void setCountryZh(String countryZh) {
this.countryZh = countryZh;
}
public String getProvinceEn() {
return this.provinceEn;
}
public void setProvinceEn(String provinceEn) {
this.provinceEn = provinceEn;
}
public String getProvinceZh() {
return this.provinceZh;
}
public void setProvinceZh(String provinceZh) {
this.provinceZh = provinceZh;
}
public String getLeaderEn() {
return this.leaderEn;
}
public void setLeaderEn(String leaderEn) {
this.leaderEn = leaderEn;
}
public String getLeaderZh() {
return this.leaderZh;
}
public void setLeaderZh(String leaderZh) {
this.leaderZh = leaderZh;
}
public String getLat() {
return this.lat;
}
public void setLat(String lat) {
this.lat = lat;
}
public String getLon() {
return this.lon;
}
public void setLon(String lon) {
this.lon = lon;
}
}
下面是部分日志,打印出CountryEn:
第一次用GreenDao， 找了很久沒發現問題，望解答，感謝。
總結
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