mysql – 为什么Eclipse提出“Object”作为数据类型“Text”的默认映射类型？
作者：互联网
当使用Eclipse(适用于Java EE开发人员的Juno 4.2)从表生成JPA实体时,它建议将Object作为我设置为Text的属性的默认映射类型.
这非常烦人,因为我必须手动将它们全部设置为String.
有人遇到过那种问题,知道该怎么办？这是一个错误吗？ Eclipse Indigo的行为并不像那样.
这是来自org.eclipse.datatools.enablement.mysql.dbdefinition_1.0.4.v201109022331.jar的/runtime/vendors/MySql_5.1/MySql_5.1.xmi :(但是根据这个文件,Text应该映射到String这个必须是错误的文件 – 但如何找到正确的文件？)
<?xml version="1.0" encoding="ASCII"?>
<DBDefinition:DatabaseVendorDefinition xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:DBDefinition="http:///org/eclipse/datatools/modelbase/dbdefinition/dbdefinition.ecore" vendor="MySql" version="5.1" maximumIdentifierLength="64" joinSupported="true" tablespacesSupported="false" maximumCommentLength="60" schemaSupported="false" aliasSupported="true" SQLStatementSupported="true">
<predefinedDataTypeDefinitions xmi:id="BIT_1" keyConstraintSupported="true"
maximumValue="1" minimumValue="0" primitiveType="SMALLINT" jdbcEnumType="-6"
javaClassName="byte">
<defaultValueTypes>0</defaultValueTypes>
<name>BIT</name>
<name>BOOL</name>
<name>BOOLEAN</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="TINYINT_UNSIGNED"
keyConstraintSupported="true" maximumValue="255" minimumValue="0"
primitiveType="SMALLINT" jdbcEnumType="-6" javaClassName="byte">
<defaultValueTypes>NULL</defaultValueTypes>
<name>TINYINT UNSIGNED</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="SMALLINT_UNSIGNED"
keyConstraintSupported="true" maximumValue="65535" minimumValue="0"
primitiveType="SMALLINT" jdbcEnumType="5" javaClassName="int">
<defaultValueTypes>0</defaultValueTypes>
<name>SMALLINT UNSIGNED</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="MEDIUMINT_UNSIGNED"
keyConstraintSupported="true" maximumValue="16777215" minimumValue="0"
primitiveType="SMALLINT" jdbcEnumType="4" javaClassName="int">
<defaultValueTypes>0</defaultValueTypes>
<name>MEDIUMINT UNSIGNED</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="INTEGER_UNSIGNED"
keyConstraintSupported="true" maximumValue="4294967295" minimumValue="0"
primitiveType="INTEGER" jdbcEnumType="4" javaClassName="int">
<defaultValueTypes>0</defaultValueTypes>
<name>INTEGER UNSIGNED</name>
<name>INT UNSIGNED</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="BIGINT_UNSIGNED"
keyConstraintSupported="true" identitySupported="true" primitiveType="BIGINT"
jdbcEnumType="-5" javaClassName="java.math.BigInteger">
<defaultValueTypes>NULL</defaultValueTypes>
<name>BIGINT UNSIGNED</name>
<name>SERIAL</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="REAL_UNSIGNED"
keyConstraintSupported="true" primitiveType="REAL" jdbcEnumType="7"
javaClassName="float">
<defaultValueTypes>NULL</defaultValueTypes>
<name>REAL UNSIGNED</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="DOUBLE_UNSIGNED_PRECISION"
keyConstraintSupported="true" primitiveType="DOUBLE_PRECISION" jdbcEnumType="8"
javaClassName="double">
<defaultValueTypes>NULL</defaultValueTypes>
<name>DOUBLE UNSIGNED</name>
<name>DOUBLE UNSIGNED PRECISION</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="FLOAT_UNSIGNED"
keyConstraintSupported="true" primitiveType="FLOAT" jdbcEnumType="6"
javaClassName="float">
<defaultValueTypes>NULL</defaultValueTypes>
<name>FLOAT UNSIGNED</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="DECIMAL_UNSIGNED"
scaleSupported="true" precisionSupported="true" maximumPrecision="64"
keyConstraintSupported="true" primitiveType="DECIMAL" jdbcEnumType="3"
javaClassName="java.math.BigDecimal">
<defaultValueTypes>NULL</defaultValueTypes>
<name>DECIMAL UNSIGNED</name>
<name>DEC UNSIGNED</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="SMALLINT_2" keyConstraintSupported="true" maximumValue="127" minimumValue="-128" primitiveType="SMALLINT" jdbcEnumType="-6" javaClassName="byte">
<defaultValueTypes>NULL</defaultValueTypes>
<name>TINYINT</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="SMALLINT_1" keyConstraintSupported="true" maximumValue="32767" minimumValue="-32768" primitiveType="SMALLINT" jdbcEnumType="5" javaClassName="short">
<defaultValueTypes>NULL</defaultValueTypes>
<name>SMALLINT</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="INTEGER_2" keyConstraintSupported="true" maximumValue="8388607" minimumValue="-8388608" primitiveType="INTEGER" jdbcEnumType="4" javaClassName="int">
<defaultValueTypes>NULL</defaultValueTypes>
<name>MEDIUMINT</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="INTEGER_1" keyConstraintSupported="true" identitySupported="true" maximumValue="2147483647" minimumValue="-2147483648" primitiveType="INTEGER" jdbcEnumType="4" javaClassName="int">
<defaultValueTypes>NULL</defaultValueTypes>
<name>INT</name>
<name>INTEGER</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="BIGINT_1" keyConstraintSupported="true" identitySupported="true" primitiveType="BIGINT" jdbcEnumType="-5" javaClassName="java.math.BigInteger">
<defaultValueTypes>NULL</defaultValueTypes>
<name>BIGINT</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="REAL_1" keyConstraintSupported="true" primitiveType="REAL" jdbcEnumType="7" javaClassName="float">
<defaultValueTypes>NULL</defaultValueTypes>
<name>REAL</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="DOUBLE_PRECISION_1" keyConstraintSupported="true" primitiveType="DOUBLE_PRECISION" jdbcEnumType="8" javaClassName="double">
<defaultValueTypes>NULL</defaultValueTypes>
<name>DOUBLE</name>
<name>DOUBLE PRECISION</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="FLOAT_1" keyConstraintSupported="true" primitiveType="FLOAT" jdbcEnumType="6" javaClassName="float">
<defaultValueTypes>NULL</defaultValueTypes>
<name>FLOAT</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="DECIMAL_1" scaleSupported="true" precisionSupported="true" maximumPrecision="64" keyConstraintSupported="true" primitiveType="DECIMAL" jdbcEnumType="3" javaClassName="java.math.BigDecimal">
<defaultValueTypes>NULL</defaultValueTypes>
<name>DECIMAL</name>
<name>DEC</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="NUMERIC_1" scaleSupported="true" precisionSupported="true" maximumPrecision="64" keyConstraintSupported="true" primitiveType="NUMERIC" jdbcEnumType="2" javaClassName="java.math.BigDecimal">
<defaultValueTypes>NULL</defaultValueTypes>
<name>NUMERIC</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="DATE_1" keyConstraintSupported="true" primitiveType="DATE" jdbcEnumType="91" javaClassName="java.sql.Date">
<defaultValueTypes>NULL</defaultValueTypes>
<name>DATE</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="TIME_1" keyConstraintSupported="true" primitiveType="TIME" jdbcEnumType="92" javaClassName="java.sql.Time">
<defaultValueTypes>NULL</defaultValueTypes>
<name>TIME</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="TIMESTAMP_1" keyConstraintSupported="true" primitiveType="TIMESTAMP" jdbcEnumType="93" javaClassName="java.sql.Timestamp">
<defaultValueTypes>NULL</defaultValueTypes>
<name>TIMESTAMP</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="TIMESTAMP_2" keyConstraintSupported="true" primitiveType="TIMESTAMP" jdbcEnumType="93" javaClassName="java.util.Date">
<defaultValueTypes>NULL</defaultValueTypes>
<name>DATETIME</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="CHARACTER_1" lengthSupported="true" keyConstraintSupported="true" maximumLength="255" jdbcEnumType="1" javaClassName="java.lang.String">
<defaultValueTypes>NULL</defaultValueTypes>
<defaultValueTypes>CURRENT_USER</defaultValueTypes>
<name>CHAR</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="CHARACTER_VARYING_1" lengthSupported="true" keyConstraintSupported="true" maximumLength="255" primitiveType="CHARACTER_VARYING" jdbcEnumType="12" javaClassName="java.lang.String">
<defaultValueTypes>NULL</defaultValueTypes>
<defaultValueTypes>CURRENT_USER</defaultValueTypes>
<name>VARCHAR</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="BINARY_LARGE_OBJECT_1" defaultSupported="false" maximumLength="256" primitiveType="BINARY_LARGE_OBJECT" jdbcEnumType="2004" javaClassName="java.sql.Blob">
<defaultValueTypes>NULL</defaultValueTypes>
<name>TINYBLOB</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="BINARY_LARGE_OBJECT_2" defaultSupported="false" maximumLength="65536" primitiveType="BINARY_LARGE_OBJECT" jdbcEnumType="2004" javaClassName="java.sql.Blob">
<defaultValueTypes>NULL</defaultValueTypes>
<name>BLOB</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="BINARY_LARGE_OBJECT_3" defaultSupported="false" maximumLength="16777216" primitiveType="BINARY_LARGE_OBJECT" jdbcEnumType="2004" javaClassName="java.sql.Blob">
<defaultValueTypes>NULL</defaultValueTypes>
<name>MEDIUMBLOB</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="BINARY_LARGE_OBJECT_4" defaultSupported="false" primitiveType="BINARY_LARGE_OBJECT" jdbcEnumType="2004" javaClassName="java.sql.Blob">
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<name>LONGBLOB</name>
</predefinedDataTypeDefinitions>
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<defaultValueTypes>NULL</defaultValueTypes>
<name>TINYTEXT</name>
</predefinedDataTypeDefinitions>
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<defaultValueTypes>NULL</defaultValueTypes>
<name>TEXT</name>
</predefinedDataTypeDefinitions>
<predefinedDataTypeDefinitions xmi:id="CHARACTER_LARGE_OBJECT_3" keyConstraintSupported="true" defaultSupported="false" maximumLength="16777216" primitiveType="CHARACTER_LARGE_OBJECT" jdbcEnumType="2005" javaClassName="java.lang.String">
<defaultValueTypes>NULL</defaultValueTypes>
<name>MEDIUMTEXT</name>
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<keywords>SQL</keywords>
<keywords>SQLEXCEPTION</keywords>
<keywords>SQLSTATE</keywords>
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<keywords>SSL</keywords>
<keywords>STARTING</keywords>
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<keywords>TABLE</keywords>
<keywords>TEMPTABLE</keywords>
<keywords>TERMINATED</keywords>
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<keywords>WITH</keywords>
<keywords>WRITE</keywords>
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<keywords>YEAR_MONTH</keywords>
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<operators>!</operators>
<operators>BINARY</operators>
<operators>COLLATE</operators>
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我的SQL：
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--
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--
LOCK TABLES `bread` WRITE;
/*!40000 ALTER TABLE `bread` DISABLE KEYS */;
/*!40000 ALTER TABLE `bread` ENABLE KEYS */;
UNLOCK TABLES;
/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;
/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
-- Dump completed on 2012-11-13 8:53:50
解决方法:
Dali(生成JPA实体的Eclipse的一部分)使用DTP(Eclipse的另一部分)来确定特定数据类型的Java属性类型.这些映射是特定于数据库平台的,并在各种DTP插件的.xmi文件中指定.
例如,在Juno中,对于PostgreSQL,数据类型ABSTIME被映射到文件中的Java类型java.lang.Object
/runtime/vendors/postgresql/postgresql_8.x.xmi
在插件罐中
./plugins/org.eclipse.datatools.enablement.postgresql.dbdefinition_1.0.2.v201110070445.jar.
根据您的数据库平台以及您安装的其他插件,这些设置可能在Indigo和Juno之间发生了变化.您可以提取相应的.xmi文件,对其进行编辑,然后将其返回到jar中,这应该会改变实体的生成方式.
标签：dali,mysql,eclipse,java-ee 来源： https://codeday.me/bug/20190926/1820563.html