4 回答
TA贡献1943条经验 获得超7个赞
不,目前无法使用 Spring Data R2DBC 从实体生成模式。
我在一个带有 Postgres DB 的项目中使用它,管理数据库迁移很复杂,但我设法在启动时使用同步 Postgre 驱动程序(Flyway 尚不支持反应式驱动程序)连接 Flyway 来处理架构迁移。
即使您仍然需要编写自己的 CREATE TABLE 语句,这应该不那么难,您甚至可以在一些简单的项目中修改实体以创建 JPA 实体并让 Hibernate 创建架构,然后将其复制粘贴到您的迁移文件中R2DBC 项目。
TA贡献1831条经验 获得超10个赞
可用于测试和生产。
我确保您的用户无权更改架构,否则您可能会错误地删除表!或者使用flyway之类的迁移工具。
您需要将 schema.sql 放入主资源中并添加相关属性
spring.r2dbc.initialization-mode=always
h2 用于测试,postgres 用于生产
我使用gradle,驱动程序的版本是:
implementation 'org.springframework.boot.experimental:spring-boot-actuator-autoconfigure-r2dbc'
runtimeOnly 'com.h2database:h2'
runtimeOnly 'io.r2dbc:r2dbc-h2'
runtimeOnly 'io.r2dbc:r2dbc-postgresql'
runtimeOnly 'org.postgresql:postgresql'
testImplementation 'org.springframework.boot.experimental:spring-boot-test-autoconfigure-r2dbc'
BOM 版本为
dependencyManagement {
imports {
mavenBom 'org.springframework.boot.experimental:spring-boot-bom-r2dbc:0.1.0.M3'
}
}
TA贡献1795条经验 获得超7个赞
实际上可以通过这样定义特定的类来加载模式:
import io.r2dbc.spi.ConnectionFactory
import org.springframework.context.annotation.Bean
import org.springframework.context.annotation.Configuration
import org.springframework.core.io.ClassPathResource
import org.springframework.data.r2dbc.repository.config.EnableR2dbcRepositories
import org.springframework.r2dbc.connection.init.ConnectionFactoryInitializer
import org.springframework.r2dbc.connection.init.ResourceDatabasePopulator
@Configuration
@EnableR2dbcRepositories
class DbConfig {
@Bean
fun initializer(connectionFactory: ConnectionFactory): ConnectionFactoryInitializer {
val initializer = ConnectionFactoryInitializer()
initializer.setConnectionFactory(connectionFactory)
initializer.setDatabasePopulator(
ResourceDatabasePopulator(
ClassPathResource("schema.sql")
)
)
return initializer
}
}
请注意,IntelliJ 会给出错误“无法自动装配。未找到‘ConnectionFactory’类型的 beans ”,但这实际上是误报。因此,忽略它并重新构建您的项目。
该schema.sql文件必须放在资源文件夹中。
TA贡献1843条经验 获得超7个赞
这就是我解决这个问题的方法:
控制器:
@PostMapping(MAP + PATH_DDL_PROC_DB) //PATH_DDL_PROC_DB = "/database/{db}/{schema}/{table}"
public Flux<Object> createDbByDb(
@PathVariable("db") String db,
@PathVariable("schema") String schema,
@PathVariable("table") String table) {
return ddlProcService.createDbByDb(db,schema,table);
服务:
public Flux<Object> createDbByDb(String db,String schema,String table) {
return ddl.createDbByDb(db,schema,table);
}
存储库:
@Autowired
PostgresqlConnectionConfiguration.Builder connConfig;
public Flux<Object> createDbByDb(String db,String schema,String table) {
return createDb(db).thenMany(
Mono.from(connFactory(connConfig.database(db)).create())
.flatMapMany(
connection ->
Flux.from(connection
.createBatch()
.add(sqlCreateSchema(db))
.add(sqlCreateTable(db,table))
.add(sqlPopulateTable(db,table))
.execute()
)));
}
private Mono<Void> createDb(String db) {
PostgresqlConnectionFactory
connectionFactory = connFactory(connConfig);
DatabaseClient ddl = DatabaseClient.create(connectionFactory);
return ddl
.execute(sqlCreateDb(db))
.then();
}
连接类别:
@Slf4j
@Configuration
@EnableR2dbcRepositories
public class Connection extends AbstractR2dbcConfiguration {
/*
**********************************************
* Spring Data JDBC:
* DDL: does not support JPA.
*
* R2DBC
* DDL:
* -does no support JPA
* -To achieve DDL, uses R2dbc.DataBaseClient
*
* DML:
* -it uses R2dbcREpositories
* -R2dbcRepositories is different than
* R2dbc.DataBaseClient
* ********************************************
*/
@Bean
public PostgresqlConnectionConfiguration.Builder connectionConfig() {
return PostgresqlConnectionConfiguration
.builder()
.host("db-r2dbc")
.port(5432)
.username("root")
.password("root");
}
@Bean
public PostgresqlConnectionFactory connectionFactory() {
return
new PostgresqlConnectionFactory(
connectionConfig().build()
);
}
}
DDL 脚本:
@Getter
@NoArgsConstructor(access = AccessLevel.PRIVATE)
public final class DDLScripts {
public static final String SQL_GET_TASK = "select * from tasks";
public static String sqlCreateDb(String db) {
String sql = "create database %1$s;";
String[] sql1OrderedParams = quotify(new String[]{db});
String finalSql = format(sql,(Object[]) sql1OrderedParams);
return finalSql;
}
public static String sqlCreateSchema(String schema) {
String sql = "create schema if not exists %1$s;";
String[] sql1OrderedParams = quotify(new String[]{schema});
return format(sql,(Object[]) sql1OrderedParams);
}
public static String sqlCreateTable(String schema,String table) {
String sql1 = "create table %1$s.%2$s " +
"(id serial not null constraint tasks_pk primary key, " +
"lastname varchar not null); ";
String[] sql1OrderedParams = quotify(new String[]{schema,table});
String sql1Final = format(sql1,(Object[]) sql1OrderedParams);
String sql2 = "alter table %1$s.%2$s owner to root; ";
String[] sql2OrderedParams = quotify(new String[]{schema,table});
String sql2Final = format(sql2,(Object[]) sql2OrderedParams);
return sql1Final + sql2Final;
}
public static String sqlPopulateTable(String schema,String table) {
String sql = "insert into %1$s.%2$s values (1, 'schema-table-%3$s');";
String[] sql1OrderedParams = quotify(new String[]{schema,table,schema});
return format(sql,(Object[]) sql1OrderedParams);
}
private static String[] quotify(String[] stringArray) {
String[] returnArray = new String[stringArray.length];
for (int i = 0; i < stringArray.length; i++) {
returnArray[i] = "\"" + stringArray[i] + "\"";
}
return returnArray;
}
}
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