这是我的架构生成代码:
Schema schema = new Schema(VERSION, "com.example.dao");
Entity player = schema.addEntity("Player");
Property playerIdProperty = player.addStringProperty("id").primaryKey().getProperty();
player.addStringProperty("name").notNull();
player.addStringProperty("created_at");
player.addStringProperty("updated_at");
Entity match = schema.addEntity("Match");
match.addStringProperty("id").primaryKey();
match.addIntProperty("score1");
match.addIntProperty("score2");
match.addStringProperty("created_at");
match.addStringProperty("updated_at");
match.addToOne(player, playerIdProperty, "dp1");
match.addToOne(player, playerIdProperty, "dp2");
match.addToOne(player, playerIdProperty, "op1");
match.addToOne(player, playerIdProperty, "op2");
new DaoGenerator().generateAll(schema, "app/src-gen");
这就是它产生的:
public class MatchDao extends AbstractDao<Match, String> {
public static final String TABLENAME = "MATCH";
/**
* Properties of entity Match.<br/>
* Can be used for QueryBuilder and for referencing column names.
*/
public static class Properties {
public final static Property Id = new Property(0, String.class, "id", true, "ID");
public final static Property Score1 = new Property(1, Integer.class, "score1", false, "SCORE1");
public final static Property Score2 = new Property(2, Integer.class, "score2", false, "SCORE2");
public final static Property Created_at = new Property(3, String.class, "created_at", false, "CREATED_AT");
public final static Property Updated_at = new Property(4, String.class, "updated_at", false, "UPDATED_AT");
public final static Property Id = new Property(5, String.class, "id", true, "ID");
};
如您所见,在MatchDao中有两个名为“Id”的属性.我需要做的是生成两个表,主键是字符串(字符串是远程数据库的要求)和4个外键(每个匹配有4个播放器).
问题是:为什么“Id”属性是重复的以及如何避免它?提前致谢
解决方法:
我犯了同样的错误.
目前您正在执行以下操作:
Entity player = schema.addEntity("Player");
Property playerIdProperty = player.addStringProperty("id").primaryKey().getProperty();
...
match.addToOne(player, playerIdProperty, "dp1");
但是您必须将playerId属性添加到目标类:
Entity player = schema.addEntity("Player");
player.addStringProperty("id").primaryKey();
...
Entity match = schema.addEntity("Match");
Property player1IdProperty = match.addLongProperty("dp1").getProperty();
...
match.addToOne(player, player1IdProperty);
希望这可以帮助!
原文地址:https://codeday.me/bug/20190624/1278386.html
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