...
MariaDB [controlloop]> select * from ExampleObjMapEc;
+-----------------+---------+
| name | version |
+-----------------+---------+
| ExampleObjMapEc | 1.0.0 |
+-----------------+---------+
MariaDB [controlloop]> select * from JpaExampleObjMapEc_EXAMPLES;
+-----------------+---------+------------+---------------+--------+-----------+--------------+
| name | version | child_name | child_version | primed | timeStamp | examples_KEY |
+-----------------+---------+------------+---------------+--------+-----------+--------------+
| ExampleObjMapEc | 1.0.0 | example1 | 1.0.0 | NULL | NULL | MyKey1 |
| ExampleObjMapEc | 1.0.0 | example2 | 1.0.0 | NULL | NULL | MyKey2 |
+-----------------+---------+------------+---------------+--------+-----------+--------------+
JpaToscaDataType_PROPERTIES table
Eclipse-Link
MariaDB [controlloop]> describe JpaToscaDataType_PROPERTIES;
+----------------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------------+--------------+------+-----+---------+-------+
| name | varchar(120) | YES | | NULL | |
| version | varchar(20) | YES | | NULL | |
| PROPERTIES | longblob | YES | | NULL | |
| PROPERTIES_KEY | varchar(255) | YES | | NULL | |
+----------------+--------------+------+-----+---------+-------+
MariaDB [controlloop]> SELECT count(1) FROM `JpaToscaDataType_PROPERTIES`;
+----------+
| count(1) |
+----------+
| 41 |
+----------+
MariaDB [controlloop]> describe ToscaProperty;
+------------------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+------------------+--------------+------+-----+---------+-------+
| DEFAULTVALUE | varchar(255) | YES | | NULL | |
| DESCRIPTION | varchar(255) | YES | | NULL | |
| ENTRYSCHEMA | longblob | YES | | NULL | |
| REQUIRED | tinyint(1) | YES | | 0 | |
| STATUS | int(11) | YES | | NULL | |
| parentLocalName | varchar(120) | NO | PRI | NULL | |
| localName | varchar(120) | NO | PRI | NULL | |
| parentKeyVersion | varchar(15) | NO | PRI | NULL | |
| parentKeyName | varchar(120) | NO | PRI | NULL | |
| name | varchar(120) | YES | | NULL | |
| version | varchar(20) | YES | | NULL | |
+------------------+--------------+------+-----+---------+-------+
MariaDB [controlloop]> SELECT count(1) FROM ToscaProperty;
+----------+
| count(1) |
+----------+
| 0 |
+----------+
Note
Right now JpaToscaProperty will generate ToscaProperty table but this one will never used. Move JpaToscaProperty as embeddable class, all max length in varchar fields will be apply.
List of Objects using ElementCollection
...
| Code Block | ||||||
|---|---|---|---|---|---|---|
| ||||||
@Entity
@Table(name = "ExampleObjListEc")
@Data
public class JpaExampleObjListEc implements Serializable {
private static final long serialVersionUID = 1L;
@EmbeddedId
@VerifyKey
@NotNull
private ExampleKey key;
@ElementCollection
@Lob
private List<@NotNull JpaExample> examples;
} |
Eclipse-Link
MariaDB [controlloop]> describe ExampleObjListEc;
+---------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------+--------------+------+-----+---------+-------+
| name | varchar(120) | NO | PRI | NULL | |
| version | varchar(20) | NO | PRI | NULL | |
+---------+--------------+------+-----+---------+-------+
...
| Code Block | ||||||
|---|---|---|---|---|---|---|
| ||||||
@Entity
@Table(name = "ExampleObjListEc")
@Data
public class JpaExampleObjListEc implements Serializable {
private static final long serialVersionUID = 1L;
@EmbeddedId
@VerifyKey
@NotNull
private ExampleKey key;
@ElementCollection
private List<@NotNull JpaExampleEmd> examples;
} |
Eclipse-Link
MariaDB [controlloop]> SHOW CREATE TABLE JpaExampleObjListEc_EXAMPLES;
+------------------------------+------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+------------------------------+------------------------------------------------------------------------------------------------------+
| JpaExampleObjListEc_EXAMPLES | CREATE TABLE `JpaExampleObjListEc_EXAMPLES` (
`PRIMED` tinyint(1) DEFAULT 0,
`timeStamp` varchar(255) DEFAULT NULL,
`child_name` varchar(255) DEFAULT NULL,
`child_version` varchar(255) DEFAULT NULL,
`name` varchar(120) DEFAULT NULL,
`version` varchar(20) DEFAULT NULL,
KEY `FK_JpaExampleObjListEc_EXAMPLES_name` (`name`,`version`),
CONSTRAINT `FK_JpaExampleObjListEc_EXAMPLES_name` FOREIGN KEY (`name`, `version`)
REFERENCES `ExampleObjListEc` (`name`, `version`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 |
+------------------------------+------------------------------------------------------------------------------------------------------+
...
| Code Block | ||||||
|---|---|---|---|---|---|---|
| ||||||
ExampleObjMap:
name: ExampleObjMap
version: 1.0.0
examples:
MyKey1:
name: example1
version: 1.0.0
MyKey2:
name: example2
version: 1.0.0 |
Eclipse-Link
MariaDB [controlloop]> describe ExampleObjMap;
+----------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------+--------------+------+-----+---------+-------+
| EXAMPLES | longblob | YES | | NULL | |
| name | varchar(120) | NO | PRI | NULL | |
| version | varchar(20) | NO | PRI | NULL | |
+----------+--------------+------+-----+---------+-------+
...
| Code Block | ||||||
|---|---|---|---|---|---|---|
| ||||||
@Entity
@Table(name = "ExampleObjMap")
@Data
public class JpaExampleObjMap implements Serializable {
private static final long serialVersionUID = 1L;
@EmbeddedId
@VerifyKey
@NotNull
private ExampleKey key;
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
@JoinTable(
joinColumns = {@JoinColumn(name = "parent_name", referencedColumnName = "name"),
@JoinColumn(name = "parent_version", referencedColumnName = "version")},
inverseJoinColumns = {@JoinColumn(name = "child_name", referencedColumnName = "name"),
@JoinColumn(name = "child_version", referencedColumnName = "version")})
private Map<@NotNull String, @NotNull JpaExample> examples;
} |
Eclipse-Link
MariaDB [controlloop]> SHOW CREATE TABLE ExampleObjMap_Example;
+-----------------------+-------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-----------------------+-------------------------------------------------------------------------------------------------------------+
| ExampleObjMap_Example | CREATE TABLE `ExampleObjMap_Example` (
`parent_name` varchar(120) NOT NULL,
`parent_version` varchar(20) NOT NULL,
`child_name` varchar(120) NOT NULL,
`child_version` varchar(20) NOT NULL,
`EXAMPLES_KEY` varchar(255) DEFAULT NULL,
PRIMARY KEY (`parent_name`,`parent_version`,`child_name`,`child_version`),
KEY `FK_ExampleObjMap_Example_child_name` (`child_name`,`child_version`),
CONSTRAINT `FK_ExampleObjMap_Example_child_name` FOREIGN KEY (`child_name`, `child_version`)
REFERENCES `Example` (`name`, `version`),
CONSTRAINT `FK_ExampleObjMap_Example_parent_name` FOREIGN KEY (`parent_name`, `parent_version`)
REFERENCES `ExampleObjMap` (`name`, `version`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 |
+-----------------------+-------------------------------------------------------------------------------------------------------------+
...
- The presence of longblob types used to store whole objects is definitely not so maintainable. The fix for those issues could be done in both Eclipse-Link and Hibernate. Before to apply the fix it needs to check the max length of varchar fields.
- Document databases store all information for a given object in a single instance in the database, and every stored object can be different from every other. So, using MongoDB/Cassandra will solve all issues.
JpaRepositoryandMongoRepositoryextendCrudRepositoryand expose the capabilities of the underlying persistence technology in addition to the rather generic persistence technology-agnostic interfaces like e.g.CrudRepository.
...