[英]Android Room migration didn't properly handle?
I am making room migration but getting this error 我正在进行房间迁移,但出现此错误
java.lang.IllegalStateException: Migration didn't properly handle words(sharif.vocapower.db.entity.Word).
Expected:
TableInfo{name='words', columns={
name=Column{name='name', type='TEXT', affinity='2', notNull=true, primaryKeyPosition=1},
mnemonic=Column{name='mnemonic', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0},
meaning=Column{name='meaning', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0},
isFavorite=Column{name='isFavorite', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0}}, foreignKeys=[], indices=[]}
Found:
TableInfo{name='words', columns={
meaning_bangla=Column{name='meaning_bangla', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=0},
meaning=Column{name='meaning', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0},
name=Column{name='name', type='TEXT', affinity='2', notNull=true, primaryKeyPosition=1},
mnemonic=Column{name='mnemonic', type='TEXT', affinity='2', notNull=false, primaryKeyPosition=0},
isFavorite=Column{name='isFavorite', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0}}, foreignKeys=[], indices=[]}
I tried to add a new field meaning_bangla
我试图添加一个新字段的
meaning_bangla
Here is my entity class 这是我的实体课
@Entity(tableName = "words")
public class Word implements Serializable{
@PrimaryKey
@ColumnInfo(name = "name")
@NonNull
private String name;
@ColumnInfo(name = "meaning")
private String meaning;
@ColumnInfo(name = "mnemonic")
private String mnemonic;
@ColumnInfo(name = "meaning_bangla")
private String meaningBangla;
/* private String meaningHindi;*/
@ColumnInfo(name = "isFavorite")
private int isFavorite;
@NonNull
public String getName() {
return name;
}
public void setName(@NonNull String name) {
this.name = name;
}
public String getMeaning() {
return meaning;
}
public void setMeaning(String meaning) {
this.meaning = meaning;
}
public int getIsFavorite() {
return isFavorite;
}
public void setIsFavorite(int isFavorite) {
this.isFavorite = isFavorite;
}
public String getMeaningBangla() {
return meaningBangla;
}
public void setMeaningBangla(String meaningBangla) {
this.meaningBangla = meaningBangla;
}
public void setMnemonic(String mnemonic) {
this.mnemonic = mnemonic;
}
public String getMnemonic() {
return mnemonic;
}
/* public String getMeaningBangla() {
return meaningBangla;
}
public void setMeaningBangla(String meaningBangla) {
this.meaningBangla = meaningBangla;
}
public Word(@NonNull String name, String meaning, String mnemonic, int isFavorite, String meaningBangla) {
this.name = name;
this.meaning = meaning;
this.mnemonic = mnemonic;
this.meaningBangla = meaningBangla;
this.isFavorite = isFavorite;
}
} }
and my migration code is looks like this 我的迁移代码如下所示
database.execSQL("ALTER TABLE words "
+ " ADD COLUMN meaning_bangla TEXT");
I am trying to solve this error but no luck :( Could anyone help me to solve this error. 我正在尝试解决此错误,但没有运气:(任何人都可以帮助我解决此错误。
尝试将NOT NULL DEFAULT''添加到迁移中。
database.execSQL("ALTER TABLE words ADD COLUMN meaning_bangla TEXT NOT NULL default ''")
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