我的数据库中有一个名为 File 的表，我想更改列的名称，因为与该列相关的 Json 字段已更改，并且我正在使用自动序列化。所以这是我的表类：
@Table(database = MyDB.class)
public class File extends BaseModel{
@PrimaryKey()
@Column(name = "id")
private String _id;
@Column
@SerializedName(NAMES.Server.NAME)
private String filename;
@Column
private String url;
@Column
private String path;
@Column
@SerializedName(NAMES.Server.MIME_TYPE)
private String mimeType;
@Column
private String caption;
@Column
private long length;
@Column
private Date createdAt;
@Column
private Date takenAt;
@Column
private Date updatedAt;
@Column
private String createdBy;
@Column
private String projectId;
@Column
private String collectionId;
@Column
@ForeignKey(stubbedRelationship = true)
transient Collection parentCollection;
public File() { }
public File(String caption){
this.caption = caption;
}
public File(String filename, String path, String mimeType, String caption) {
this._id = new ObjectId().toString();
this.filename = filename;
this.path = path;
this.mimeType = mimeType;
this.caption = caption;
}
public File(@NonNull File file) {
_id = file._id;
filename = file.filename;
url = file.url;
path = file.path;
mimeType = file.mimeType;
caption = file.caption;
length = file.length;
createdAt = file.createdAt;
takenAt = file.takenAt;
updatedAt = file.updatedAt;
createdBy = file.createdBy;
projectId = file.projectId;
collectionId = file.collectionId;
}
public String get_id() {
return _id;
}
public void set_id(String _id) {
this._id = _id;
}
public String getFilename() {
return filename;
}
public void setFilename(String filename) {
this.filename = filename;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getPath() {
return path;
}
public void setPath(String path) {
this.path = path;
}
public String getMimeType() {
return mimeType;
}
public void setMimeType(String mimeType) {
this.mimeType = mimeType;
}
public String getCaption() {
return caption;
}
public void setCaption(String caption) {
this.caption = caption;
}
public long getLength() {
return length;
}
public void setLength(long length) {
this.length = length;
}
public Date getCreatedAt() {
return createdAt;
}
public void setCreatedAt(Date createdAt) {
this.createdAt = createdAt;
}
public Date getUpdatedAt() {
return updatedAt;
}
public void setUpdatedAt(Date updatedAt) {
this.updatedAt = updatedAt;
}
public Date getTakenAt() {
return takenAt;
}
public void setTakenAt(Date takenAt) {
this.takenAt = takenAt;
}
public String getCreatedBy() {
return createdBy;
}
public void setCreatedBy(String createdBy) {
this.createdBy = createdBy;
}
public String getProjectId() {
return projectId;
}
public void setProjectId(String projectId) {
this.projectId = projectId;
}
public String getCollectionId() {
return collectionId;
}
public void setCollectionId(String collectionId) {
this.collectionId = collectionId;
}
@Override
public boolean equals(Object obj) {
if(obj instanceof File){
return _id.equals(((File) obj)._id);
}
return false;
}
public void associateParent(Collection collection){
parentCollection = (collection);
}
public boolean isLocal() {
return path != null && url == null;
}
public static List<File> copy(List<File> files) {
if (files != null && files.size() > 0) {
List<File> copy = new ArrayList<>(files.size());
for (File file : files) {
copy.add(new File(file));
}
return copy;
}else {
return null;
}
}
}
我想更改“文件名”列。但正如你所看到的，我正在使用@Serialization这个特定的领域。我的问题是：是否可以更改此名称而无需在表中创建新列并删除该列？我考虑过运行迁移脚本，但无法使用迁移脚本更改列的名称，对吧？
编辑，这是我的 File_table 类：
/**
* This is generated code. Please do not modify */
public final class File_Table extends ModelAdapter<File> {
/**
* Primary Key */
public static final Property<String> id = new Property<String>(File.class, "id");
public static final Property<String> filename = new Property<String>(File.class, "filename");
public static final Property<String> url = new Property<String>(File.class, "url");
public static final Property<String> path = new Property<String>(File.class, "path");
public static final Property<String> mimeType = new Property<String>(File.class, "mimeType");
public static final Property<String> caption = new Property<String>(File.class, "caption");
public static final Property<Long> length = new Property<Long>(File.class, "length");
public static final TypeConvertedProperty<Long, Date> createdAt = new TypeConvertedProperty<Long, Date>(File.class, "createdAt", true,
new TypeConvertedProperty.TypeConverterGetter() {
@Override
public TypeConverter getTypeConverter(Class<?> modelClass) {
File_Table adapter = (File_Table) FlowManager.getInstanceAdapter(modelClass);
return adapter.global_typeConverterDateConverter;
}
});
public static final TypeConvertedProperty<Long, Date> takenAt = new TypeConvertedProperty<Long, Date>(File.class, "takenAt", true,
new TypeConvertedProperty.TypeConverterGetter() {
@Override
public TypeConverter getTypeConverter(Class<?> modelClass) {
File_Table adapter = (File_Table) FlowManager.getInstanceAdapter(modelClass);
return adapter.global_typeConverterDateConverter;
}
});
public static final TypeConvertedProperty<Long, Date> updatedAt = new TypeConvertedProperty<Long, Date>(File.class, "updatedAt", true,
new TypeConvertedProperty.TypeConverterGetter() {
@Override
public TypeConverter getTypeConverter(Class<?> modelClass) {
File_Table adapter = (File_Table) FlowManager.getInstanceAdapter(modelClass);
return adapter.global_typeConverterDateConverter;
}
});
public static final Property<String> createdBy = new Property<String>(File.class, "createdBy");
public static final Property<String> projectId = new Property<String>(File.class, "projectId");
public static final Property<String> collectionId = new Property<String>(File.class, "collectionId");
/**
* Foreign Key */
public static final Property<String> parentCollection_id = new Property<String>(File.class, "parentCollection_id");
public static final IProperty[] ALL_COLUMN_PROPERTIES = new IProperty[]{id,filename,url,path,mimeType,caption,length,createdAt,takenAt,updatedAt,createdBy,projectId,collectionId,parentCollection_id};
private final DateConverter global_typeConverterDateConverter;
public File_Table(DatabaseHolder holder, DatabaseDefinition databaseDefinition) {
super(databaseDefinition);
global_typeConverterDateConverter = (DateConverter) holder.getTypeConverterForClass(Date.class);
}
@Override
public final Class<File> getModelClass() {
return File.class;
}
@Override
public final String getTableName() {
return "`File`";
}
@Override
public final File newInstance() {
return new File();
}
@Override
public final Property getProperty(String columnName) {
columnName = QueryBuilder.quoteIfNeeded(columnName);
switch ((columnName)) {
case "`id`": {
return id;
}
case "`filename`": {
return filename;
}
case "`url`": {
return url;
}
case "`path`": {
return path;
}
case "`mimeType`": {
return mimeType;
}
case "`caption`": {
return caption;
}
case "`length`": {
return length;
}
case "`createdAt`": {
return createdAt;
}
case "`takenAt`": {
return takenAt;
}
case "`updatedAt`": {
return updatedAt;
}
case "`createdBy`": {
return createdBy;
}
case "`projectId`": {
return projectId;
}
case "`collectionId`": {
return collectionId;
}
case "`parentCollection_id`": {
return parentCollection_id;
}
default: {
throw new IllegalArgumentException("Invalid column name passed. Ensure you are calling the correct table's column");
}
}
}
@Override
public final IProperty[] getAllColumnProperties() {
return ALL_COLUMN_PROPERTIES;
}
@Override
public final void bindToInsertValues(ContentValues values, File model) {
values.put("`id`", model.get_id() != null ? model.get_id() : null);
values.put("`filename`", model.getFilename() != null ? model.getFilename() : null);
values.put("`url`", model.getUrl() != null ? model.getUrl() : null);
values.put("`path`", model.getPath() != null ? model.getPath() : null);
values.put("`mimeType`", model.getMimeType() != null ? model.getMimeType() : null);
values.put("`caption`", model.getCaption() != null ? model.getCaption() : null);
values.put("`length`", model.getLength());
Long refcreatedAt = model.getCreatedAt() != null ? global_typeConverterDateConverter.getDBValue(model.getCreatedAt()) : null;
values.put("`createdAt`", refcreatedAt != null ? refcreatedAt : null);
Long reftakenAt = model.getTakenAt() != null ? global_typeConverterDateConverter.getDBValue(model.getTakenAt()) : null;
values.put("`takenAt`", reftakenAt != null ? reftakenAt : null);
Long refupdatedAt = model.getUpdatedAt() != null ? global_typeConverterDateConverter.getDBValue(model.getUpdatedAt()) : null;
values.put("`updatedAt`", refupdatedAt != null ? refupdatedAt : null);
values.put("`createdBy`", model.getCreatedBy() != null ? model.getCreatedBy() : null);
values.put("`projectId`", model.getProjectId() != null ? model.getProjectId() : null);
values.put("`collectionId`", model.getCollectionId() != null ? model.getCollectionId() : null);
if (model.parentCollection != null) {
values.put("`parentCollection_id`", model.parentCollection.getId());
} else {
values.putNull("`parentCollection_id`");
}
}
@Override
public final void bindToInsertStatement(DatabaseStatement statement, File model, int start) {
statement.bindStringOrNull(1 + start, model.get_id());
statement.bindStringOrNull(2 + start, model.getFilename());
statement.bindStringOrNull(3 + start, model.getUrl());
statement.bindStringOrNull(4 + start, model.getPath());
statement.bindStringOrNull(5 + start, model.getMimeType());
statement.bindStringOrNull(6 + start, model.getCaption());
statement.bindLong(7 + start, model.getLength());
Long refcreatedAt = model.getCreatedAt() != null ? global_typeConverterDateConverter.getDBValue(model.getCreatedAt()) : null;
statement.bindNumberOrNull(8 + start, refcreatedAt);
Long reftakenAt = model.getTakenAt() != null ? global_typeConverterDateConverter.getDBValue(model.getTakenAt()) : null;
statement.bindNumberOrNull(9 + start, reftakenAt);
Long refupdatedAt = model.getUpdatedAt() != null ? global_typeConverterDateConverter.getDBValue(model.getUpdatedAt()) : null;
statement.bindNumberOrNull(10 + start, refupdatedAt);
statement.bindStringOrNull(11 + start, model.getCreatedBy());
statement.bindStringOrNull(12 + start, model.getProjectId());
statement.bindStringOrNull(13 + start, model.getCollectionId());
if (model.parentCollection != null) {
statement.bindStringOrNull(14 + start, model.parentCollection.getId());
} else {
statement.bindNull(14 + start);
}
}
@Override
public final void bindToUpdateStatement(DatabaseStatement statement, File model) {
statement.bindStringOrNull(1, model.get_id());
statement.bindStringOrNull(2, model.getFilename());
statement.bindStringOrNull(3, model.getUrl());
statement.bindStringOrNull(4, model.getPath());
statement.bindStringOrNull(5, model.getMimeType());
statement.bindStringOrNull(6, model.getCaption());
statement.bindLong(7, model.getLength());
Long refcreatedAt = model.getCreatedAt() != null ? global_typeConverterDateConverter.getDBValue(model.getCreatedAt()) : null;
statement.bindNumberOrNull(8, refcreatedAt);
Long reftakenAt = model.getTakenAt() != null ? global_typeConverterDateConverter.getDBValue(model.getTakenAt()) : null;
statement.bindNumberOrNull(9, reftakenAt);
Long refupdatedAt = model.getUpdatedAt() != null ? global_typeConverterDateConverter.getDBValue(model.getUpdatedAt()) : null;
statement.bindNumberOrNull(10, refupdatedAt);
statement.bindStringOrNull(11, model.getCreatedBy());
statement.bindStringOrNull(12, model.getProjectId());
statement.bindStringOrNull(13, model.getCollectionId());
if (model.parentCollection != null) {
statement.bindStringOrNull(14, model.parentCollection.getId());
} else {
statement.bindNull(14);
}
statement.bindStringOrNull(15, model.get_id());
}
@Override
public final void bindToDeleteStatement(DatabaseStatement statement, File model) {
statement.bindStringOrNull(1, model.get_id());
}
@Override
public final String getCompiledStatementQuery() {
return "INSERT INTO `File`(`id`,`filename`,`url`,`path`,`mimeType`,`caption`,`length`,`createdAt`,`takenAt`,`updatedAt`,`createdBy`,`projectId`,`collectionId`,`parentCollection_id`) VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?)";
}
@Override
public final String getUpdateStatementQuery() {
return "UPDATE `File` SET `id`=?,`filename`=?,`url`=?,`path`=?,`mimeType`=?,`caption`=?,`length`=?,`createdAt`=?,`takenAt`=?,`updatedAt`=?,`createdBy`=?,`projectId`=?,`collectionId`=?,`parentCollection_id`=? WHERE `id`=?";
}
@Override
public final String getDeleteStatementQuery() {
return "DELETE FROM `File` WHERE `id`=?";
}
@Override
public final String getCreationQuery() {
return "CREATE TABLE IF NOT EXISTS `File`(`id` TEXT, `filename` TEXT, `url` TEXT, `path` TEXT, `mimeType` TEXT, `caption` TEXT, `length` INTEGER, `createdAt` TEXT, `takenAt` TEXT, `updatedAt` TEXT, `createdBy` TEXT, `projectId` TEXT, `collectionId` TEXT, `parentCollection_id` TEXT, PRIMARY KEY(`id`)"+ ", FOREIGN KEY(`parentCollection_id`) REFERENCES " + com.raizlabs.android.dbflow.config.FlowManager.getTableName(com.construct.v2.models.Collection.class) + "(`id`) ON UPDATE NO ACTION ON DELETE NO ACTION" + ");";
}
@Override
public final void loadFromCursor(FlowCursor cursor, File model) {
model.set_id(cursor.getStringOrDefault("id"));
model.setFilename(cursor.getStringOrDefault("filename"));
model.setUrl(cursor.getStringOrDefault("url"));
model.setPath(cursor.getStringOrDefault("path"));
model.setMimeType(cursor.getStringOrDefault("mimeType"));
model.setCaption(cursor.getStringOrDefault("caption"));
model.setLength(cursor.getLongOrDefault("length"));
int index_createdAt = cursor.getColumnIndex("createdAt");
if (index_createdAt != -1 && !cursor.isNull(index_createdAt)) {
model.setCreatedAt(global_typeConverterDateConverter.getModelValue(cursor.getLong(index_createdAt)));
} else {
model.setCreatedAt(global_typeConverterDateConverter.getModelValue(null));
}
int index_takenAt = cursor.getColumnIndex("takenAt");
if (index_takenAt != -1 && !cursor.isNull(index_takenAt)) {
model.setTakenAt(global_typeConverterDateConverter.getModelValue(cursor.getLong(index_takenAt)));
} else {
model.setTakenAt(global_typeConverterDateConverter.getModelValue(null));
}
int index_updatedAt = cursor.getColumnIndex("updatedAt");
if (index_updatedAt != -1 && !cursor.isNull(index_updatedAt)) {
model.setUpdatedAt(global_typeConverterDateConverter.getModelValue(cursor.getLong(index_updatedAt)));
} else {
model.setUpdatedAt(global_typeConverterDateConverter.getModelValue(null));
}
model.setCreatedBy(cursor.getStringOrDefault("createdBy"));
model.setProjectId(cursor.getStringOrDefault("projectId"));
model.setCollectionId(cursor.getStringOrDefault("collectionId"));
int index_parentCollection_id_Collection_Table = cursor.getColumnIndex("parentCollection_id");
if (index_parentCollection_id_Collection_Table != -1 && !cursor.isNull(index_parentCollection_id_Collection_Table)) {
model.parentCollection = new Collection();
model.parentCollection.setId(cursor.getString(index_parentCollection_id_Collection_Table));
} else {
model.parentCollection = null;
}
}
@Override
public final boolean exists(File model, DatabaseWrapper wrapper) {
return SQLite.selectCountOf()
.from(File.class)
.where(getPrimaryConditionClause(model))
.hasData(wrapper);
}
@Override
public final OperatorGroup getPrimaryConditionClause(File model) {
OperatorGroup clause = OperatorGroup.clause();
clause.and(id.eq(model.get_id()));
return clause;
}
}