ormlite

问题 Hello i am facing a problem: I need to store a tree representation of subjects. I mean a SUBJECT have a list of childrens of type SUBJECT @DatabaseTable(tableName = "subject") public class Subject implements Serializable { @DatabaseField(columnName = "_id") private int id; @DatabaseField private String text; @DatabaseField(columnName = "parent", foreign = true) private Subject parent; @ForeignCollectionField private List<Subject> sons; this code throws an error 9950-9950/ec.com.smx.flux E/EC

问题 I am parsing json data using Jackson from api call and trying to insert the data in sqlite using ormlite . For this i am using same model class. Here is my model classes public class Site { @DatabaseField(generatedId=true,columnName="ID") private int id; @DatabaseField(columnName="NAME") private String name; @ForeignCollectionField(eager=true) Collection<Visit> visits; Site() { } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return

问题 I'm using ormlite for android and I have a database table class that extends OrmLiteSqliteOpenHelper. I've had some reports in google play that the application had a force close caused by: android.database.sqlite.SQLiteException: Can't downgrade database from version 3 to 2 The users probably get to downgrade via a backup or something. The problem is I cannot implement the onDowngrade method that exists on SQLiteOpenHelper: Does ormlite support the downgrade? Is there any work around for this

问题 I'm using ORMLite on Android and have the following question: Is it possible to create many tables based on a single Java class? The tables should only differ in their names, and the access to them should be by name. For example if I have a class: public class Order{ @DatabaseField public string Name; @DatabaseField public string Amount; } And I have a dynamic number of modules that can create orders. I want every module to have its own table, but all tables should have a similar schema. I

问题 I'm using ORMLite on Android and have the following question: Is it possible to create many tables based on a single Java class? The tables should only differ in their names, and the access to them should be by name. For example if I have a class: public class Order{ @DatabaseField public string Name; @DatabaseField public string Amount; } And I have a dynamic number of modules that can create orders. I want every module to have its own table, but all tables should have a similar schema. I

问题 What type of data I should define on my java model for PostgreSQL money type? I know I could use BigDecimal, but it map to varchar(255) on PostgreSQL. 回答1: I think that @a_horse's comment provides some good information but I thought I'd add some additional ORMLite's specific details. You could use ORMLite's BIG_DECIMAL_NUMERIC which will store it in Postgres as NUMERIC . You'll need to specify it as: @DatabaseFiled(dataType = BIG_DECIMAL_NUMERIC) BigDecimal number; If you are set on using the

问题 What type of data I should define on my java model for PostgreSQL money type? I know I could use BigDecimal, but it map to varchar(255) on PostgreSQL. 回答1: I think that @a_horse's comment provides some good information but I thought I'd add some additional ORMLite's specific details. You could use ORMLite's BIG_DECIMAL_NUMERIC which will store it in Postgres as NUMERIC . You'll need to specify it as: @DatabaseFiled(dataType = BIG_DECIMAL_NUMERIC) BigDecimal number; If you are set on using the

问题 I'm having some issue with understanding join queries in ormlite. ormlite query builder supports 4 join methods. 1. join() 2. joinOr(); 3. leftJoin(); 4. leftJoinOr(); I can understand join() following picture illustrates join() method. Please explain me other join methods using similar pictures? (I can understand other join types in generic SQL, but when it comes to ORMLite query builder methods are different it seems) Pictures taken from this post. 回答1: Please explain me other join methods

问题 I want to create a SELECT statement, which is a union of two sub-queries. Is there any way in ORMLite to create the two queries with QueryBuilder , and then concatenate them and create a UNION like this with a third QueryBuilder : SELECT * FROM ( FIRST SELECT UNION SECOND SELECT) WHERE isdefault = 0 ORDER BY someRow; someRow also changes dinamically. As for as i know QueryBuilder does not support UNION directly, so somehow i should inject the concatenated union into its statement. As the

问题 Looking to store android.location.Address to a SQLite database. I am using ORMLite to persist my objects. ORMLite can persist Serializable items (as a BLOB I believe) but I think the only way to get something Serializable from an Address is to write it into a Parcel. Then I took a look at Parcel here: http://developer.android.com/reference/android/os/Parcel.html and it says it should not be used for general purpose Serialization mechanism. So I am just wondering what the best practice for