DBFlow源码分析：model相关

类结构

model相关

结构说明

1. Model提供表，字段等基本信息，
2. ModelAdapter根据Model提供了一些功能职责：增删改查。dbflow根据你提供的信息生成具体的职责处理的代码。
3. ModeSaver是ModelAdapter的功能职责的维护者，它汇聚ModelAdapter的功能，再根据ModelAdapter提供的信息执行具体的操作。

举个例子

保存model信息到数据库。

定义model信息：

@Table(name = "OtherModel", database = AppDatabase.class)
public class OtherModel extends BaseModel {

    @Column
    @PrimaryKey
    String name;
}

编译后，生成的Adapter：OtherModel_Table

/**
 * This is generated code. Please do not modify */
public final class OtherModel_Table extends ModelAdapter {

  //依据model信息，生成的字段信息：name
  /**
   * Primary Key */
  public static final Property name = new Property(OtherModel.class, "name");

  public static final IProperty[] ALL_COLUMN_PROPERTIES = new IProperty[]{name};

  public OtherModel_Table(DatabaseHolder holder, DatabaseDefinition databaseDefinition) {
    super(databaseDefinition);
  }

  @Override
  public final Class getModelClass() {
    return OtherModel.class;
  }

  // 依据model信息，生成的表的名字：OtherModel
  public final String getTableName() {
    return "`OtherModel`";
  }

  @Override
  public final BaseProperty getProperty(String columnName) {
    columnName = QueryBuilder.quoteIfNeeded(columnName);
    switch (columnName)  {
      case "`name`":  {
        return name;
      }
      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, OtherModel model) {
    values.put("name", model.name != null ? model.name : null);
  }

  @Override
  public final void bindToContentValues(ContentValues values, OtherModel model) {
    bindToInsertValues(values, model);
  }

  @Override
  public final void bindToInsertStatement(DatabaseStatement statement, OtherModel model, int start) {
    if (model.name != null)  {
      statement.bindString(1 + start, model.name);
    } else {
      statement.bindNull(1 + start);
    }
  }

  @Override
  public final void bindToStatement(DatabaseStatement statement, OtherModel model) {
    bindToInsertStatement(statement, model, 0);
  }

  @Override
  public final String getInsertStatementQuery() {
    return "INSERT INTO `OtherModel`(`name`) VALUES (?)";
  }

  @Override
  public final String getCompiledStatementQuery() {
    return "INSERT INTO `OtherModel`(`name`) VALUES (?)";
  }

  @Override
  public final String getCreationQuery() {
    return "CREATE TABLE IF NOT EXISTS `OtherModel`(`name` TEXT, PRIMARY KEY(`name`)" + ");";
  }

  @Override
  public final void loadFromCursor(Cursor cursor, OtherModel model) {
    int index_name = cursor.getColumnIndex("name");
    if (index_name != -1 && !cursor.isNull(index_name)) {
      model.name = cursor.getString(index_name);
    } else {
      model.name = null;
    }
  }

  @Override
  public final boolean exists(OtherModel model, DatabaseWrapper wrapper) {
    return SQLite.selectCountOf()
    .from(OtherModel.class)
    .where(getPrimaryConditionClause(model))
    .hasData(wrapper);
  }

  @Override
  public final ConditionGroup getPrimaryConditionClause(OtherModel model) {
    ConditionGroup clause = ConditionGroup.clause();
    clause.and(name.eq(model.name));
    return clause;
  }

  @Override
  public final OtherModel newInstance() {
    return new OtherModel();
  }

保存这个model：

OtherModel otherModel= new OtherModel();
otherModel.name="wang";
otherModel.save();

交给adapter保存:

 public void save() {
        getModelAdapter().save(this);
 }

adapter交给modelSaver处理保存：

 public synchronized boolean save(@NonNull TModel model, DatabaseWrapper wrapper) {
        return save(model, wrapper, modelAdapter.getInsertStatement(wrapper), new ContentValues());
 }

save

1. exist
   OtherModel_Table中生成的代码：

   
   
   
2. update