使用 Redshift 设置的 QueryDSL
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【中文标题】使用 Redshift 设置的 QueryDSL【英文标题】：QueryDSL with Redshift setup 【发布时间】：2016-05-09 05:37:16 【问题描述】：我正在尝试将 QueryDSL 添加到使用 Amazon Redshift 的项目中。我不确定 QueryDSL 是否支持 Redshift，我可能在这里做错了很多。我在 Q 类中遇到编译错误，请参阅下面的相关摘录：
TABLE DDL (REDSHIFT)（注意 users_follow 表缺少 id 列和二进制主键）
CREATE TABLE users_follow (
user_id1 INT8 NOT NULL,
user_id2 INT8 NOT NULL,
active INT2 NOT NULL,
created_at TIMESTAMP NOT NULL,
modified_at TIMESTAMP NOT NULL,
PRIMARY KEY (user_id1, user_id2),
FOREIGN KEY (user_id1) REFERENCES users (id),
FOREIGN KEY (user_id2) REFERENCES users (id)
)
CREATE TABLE users (
id INT8 NOT NULL,
username VARCHAR(255),
PRIMARY KEY (id)
)
POM 依赖部分
<dependency>
<groupId>com.querydsl</groupId>
<artifactId>querydsl-sql</artifactId>
<version>4.1.0</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>com.querydsl</groupId>
<artifactId>querydsl-sql-codegen</artifactId>
<version>4.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.querydsl</groupId>
<artifactId>querydsl-sql-spring</artifactId>
<version>4.1.0</version>
</dependency>
POM 插件部分
<plugin>
<groupId>com.querydsl</groupId>
<artifactId>querydsl-maven-plugin</artifactId>
<version>4.1.0</version>
<executions>
<execution>
<goals>
<goal>export</goal>
</goals>
</execution>
</executions>
<configuration>
<jdbcDriver>com.amazon.redshift.core.jdbc41.PGJDBC41Driver</jdbcDriver>
<jdbcUrl>jdbc:redshift://aUrl.com:5439/aSchema</jdbcUrl>
<jdbcPassword>aPassword</jdbcPassword>
<jdbcUser>aUser</jdbcUser>
<packageName>com.myproject.domain</packageName>
<targetFolder>$project.basedir/target/generated-sources/java</targetFolder>
<sourceFolder>$project.basedir/target/generated-sources/java</sourceFolder>
</configuration>
<dependencies>
<dependency>
<groupId>com.amazonaws</groupId>
<artifactId>redshift</artifactId>
<version>$redshift.version</version>
</dependency>
</dependencies>
</plugin>
从 mvn clean install -Dmaven.test.skip=true -e -X 输出
...
[INFO] Exported users_follow successfully
...
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] path/target/generated-sources/java/com/myproject/domain/QUsersFollow.java:[43,109] cannot find symbol
symbol: variable id
location: class com.myproject.domain.QUsersFollow
[ERROR] path/target/generated-sources/java/com/myproject/domain/QUsersFollow.java:[45,109] cannot find symbol
symbol: variable id
location: class com.myproject.domain.QUsersFollow
[INFO] 18 errors
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 21.210 s
[INFO] Finished at: 2016-05-09T04:00:53+00:00
[INFO] Final Memory: 40M/373M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.5.1:compile (default-compile) on project analytics-service: Compilation failure: Compilation failure:
[ERROR] path/target/generated-sources/java/com/myproject/domain/QUsersFollow.java:[43,109] cannot find symbol
[ERROR] symbol: variable id
[ERROR] location: class com.myproject.domain.QUsersFollow
[ERROR] path/target/generated-sources/java/com/myproject/domain/QUsersFollow.java:[45,109] cannot find symbol
[ERROR] symbol: variable id
[ERROR] -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.5.1:compile (default-compile) on project analytics-service: Compilation failure
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:862)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:286)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:197)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.apache.maven.plugin.compiler.CompilationFailureException: Compilation failure
at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:972)
at org.apache.maven.plugin.compiler.CompilerMojo.execute(CompilerMojo.java:129)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
... 20 more
生成的 QCLASS（注意无法解析符号 'id'）
package com.myproject.domain;
import static com.querydsl.core.types.PathMetadataFactory.*;
import com.querydsl.core.types.dsl.*;
import com.querydsl.core.types.PathMetadata;
import javax.annotation.Generated;
import com.querydsl.core.types.Path;
import com.querydsl.sql.ColumnMetadata;
import java.sql.Types;
/**
* QUsersFollow is a Querydsl query type for QUsersFollow
*/
@Generated("com.querydsl.sql.codegen.MetaDataSerializer")
public class QUsersFollow extends com.querydsl.sql.RelationalPathBase<QUsersFollow>
private static final long serialVersionUID = 463786116;
public static final QUsersFollow usersFollow = new QUsersFollow("users_follow");
public final NumberPath<Short> active = createNumber("active", Short.class);
public final DateTimePath<java.sql.Timestamp> createdAt = createDateTime("createdAt", java.sql.Timestamp.class);
public final DateTimePath<java.sql.Timestamp> modifiedAt = createDateTime("modifiedAt", java.sql.Timestamp.class);
public final NumberPath<Long> userId1 = createNumber("userId1", Long.class);
public final NumberPath<Long> userId2 = createNumber("userId2", Long.class);
public final com.querydsl.sql.PrimaryKey<QUsersFollow> usersFollowNewPkey = createPrimaryKey(userId1, userId2);
public final com.querydsl.sql.ForeignKey<QUsers> usersFollowNewUserId1Fkey = createForeignKey(userId1, "id");
public final com.querydsl.sql.ForeignKey<QUsers> usersFollowNewUserId2Fkey = createForeignKey(userId2, "id");
public final com.querydsl.sql.ForeignKey<QUsersFollow> _usersFollowNewUserId1Fkey = createInvForeignKey(id, "user_id1"); //cannot resolve symbol 'id'
public final com.querydsl.sql.ForeignKey<QUsersFollow> _usersFollowNewUserId2Fkey = createInvForeignKey(id, "user_id2"); //cannot resolve symbol 'id'
public QUsersFollow(String variable)
super(QUsersFollow.class, forVariable(variable), "public", "users_follow");
addMetadata();
public QUsersFollow(String variable, String schema, String table)
super(QUsersFollow.class, forVariable(variable), schema, table);
addMetadata();
public QUsersFollow(Path<? extends QUsersFollow> path)
super(path.getType(), path.getMetadata(), "public", "users_follow");
addMetadata();
public QUsersFollow(PathMetadata metadata)
super(QUsersFollow.class, metadata, "public", "users_follow");
addMetadata();
public void addMetadata()
addMetadata(active, ColumnMetadata.named("active").withIndex(3).ofType(Types.SMALLINT).withSize(5).notNull());
addMetadata(createdAt, ColumnMetadata.named("created_at").withIndex(4).ofType(Types.TIMESTAMP).withSize(29).withDigits(6).notNull());
addMetadata(modifiedAt, ColumnMetadata.named("modified_at").withIndex(5).ofType(Types.TIMESTAMP).withSize(29).withDigits(6).notNull());
addMetadata(userId1, ColumnMetadata.named("user_id1").withIndex(1).ofType(Types.BIGINT).withSize(19).notNull());
addMetadata(userId2, ColumnMetadata.named("user_id2").withIndex(2).ofType(Types.BIGINT).withSize(19).notNull());
【问题讨论】：
使用 QueryDSL 4.1.0 和 Postgres 对我来说可以正常工作 - 但它不会生成“反向”外键，这是问题的根本原因。但我找不到任何启用它的选项。您是否尝试过当前版本？或者至少 4.0.8？ @a_horse_with_no_name 用 4.1.0 试过，问题依然存在。 【参考方案1】：QueryDSL 开发人员：Redshift 不是受支持的数据库，我想说 JDBC 驱动程序未正确提供数据库元数据。
https://github.com/querydsl/querydsl/issues/1880
【讨论】：
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