Hsql - create schema if not exists in spring boot application

问题

I am using embedded hsql db in my spring boot application and want to create a schema only if does not exist in the db.

Assuming the schema name is XXX,

I have the below single statement schema-hsql.sql file:

CREATE SCHEMA XXX IF NOT EXISTS

However this is faing with below stack trace:

org.springframework.jdbc.datasource.init.ScriptStatementFailedException: Failed to execute SQL script statement #1 of URL [file:/xxx/schema-hsql.sql]: CREATE SCHEMA XXX IF NOT EXISTS; nested exception is java.sql.SQLSyntaxErrorException: unexpected token: IF

at org.springframework.jdbc.datasource.init.ScriptUtils.executeSqlScript(ScriptUtils.java:494)
    at org.springframework.jdbc.datasource.init.ResourceDatabasePopulator.populate(ResourceDatabasePopulator.java:231)
    at org.springframework.jdbc.datasource.init.DatabasePopulatorUtils.execute(DatabasePopulatorUtils.java:48)
    at org.springframework.boot.autoconfigure.jdbc.DataSourceInitializer.runScripts(DataSourceInitializer.java:157)
    at org.springframework.boot.autoconfigure.jdbc.DataSourceInitializer.runSchemaScripts(DataSourceInitializer.java:81)
    at org.springframework.boot.autoconfigure.jdbc.DataSourceInitializer.init(DataSourceInitializer.java:75)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:354)
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:305)
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:133)
    ... 65 more
Caused by: java.sql.SQLSyntaxErrorException: unexpected token: IF
    at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source)
    at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source)
    at org.hsqldb.jdbc.JDBCStatement.fetchResult(Unknown Source)
    at org.hsqldb.jdbc.JDBCStatement.execute(Unknown Source)
    at com.mchange.v2.c3p0.impl.NewProxyStatement.execute(NewProxyStatement.java:909)
    at org.springframework.jdbc.datasource.init.ScriptUtils.executeSqlScript(ScriptUtils.java:473)
    ... 77 more
Caused by: org.hsqldb.HsqlException: unexpected token: IF
    at org.hsqldb.error.Error.parseError(Unknown Source)
    at org.hsqldb.ParserBase.unexpectedToken(Unknown Source)
    at org.hsqldb.ParserDDL.getCompiledStatementBody(Unknown Source)
    at org.hsqldb.ParserDDL.compileCreateSchema(Unknown Source)
    at org.hsqldb.ParserDDL.compileCreate(Unknown Source)
    at org.hsqldb.ParserCommand.compilePart(Unknown Source)
    at org.hsqldb.ParserCommand.compileStatements(Unknown Source)
    at org.hsqldb.Session.executeDirectStatement(Unknown Source)
    at org.hsqldb.Session.execute(Unknown Source)
    ... 81 more

What is the correct syntax for achieving this?

Thanks

回答1:

use

CREATE SCHEMA IF NOT EXISTS XXX

instead of your sql

CREATE SCHEMA XXX IF NOT EXISTS

and use org.hsqldb::hsqldb v.2.4.0

See: Hsql - create schema if not exists in spring boot application

回答2:

You can also specify this in your `hibernate.cfg.xml" as following :

<!-- Drop and re-create the database schema on startup -->
<property name="hbm2ddl.auto">create</property>

Here's full example :

<session-factory>

    <!-- Database connection settings -->
    <property name="connection.driver_class">org.h2.Driver</property>
    <property name="connection.url">jdbc:h2:file:db/personh2db;DB_CLOSE_DELAY=-1;MVCC=TRUE</property>
    <property name="connection.username">sa</property>
    <property name="connection.password"/>

    <!-- JDBC connection pool (use the built-in) -->
    <property name="connection.pool_size">1</property>

    <!-- SQL dialect -->
    <property name="dialect">org.hibernate.dialect.H2Dialect</property>

    <!-- Disable the second-level cache  -->
    <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>

    <!-- Echo all executed SQL to stdout -->
    <property name="show_sql">true</property>

    <!-- Drop and re-create the database schema on startup -->
    <property name="hbm2ddl.auto">create</property>

    <mapping resource="com/example/model/Person.hbm.xml"/>

</session-factory>

The list of possible options for hbm2ddl.autoare,

validate: validate the schema, makes no changes to the database.
update: update the schema.
create: creates the schema, destroying previous data.
create-drop: drop the schema at the end of the session.

EDIT

You can configure hibernate properties in application.properties when you're using Spring boot.

Here's the documentation for application.properties : https://docs.spring.io/spring-boot/docs/current/reference/html/common-application-properties.html

You can find an example for hbm2ddl.auto configuration here : http://docs.spring.io/spring-boot/docs/current/reference/html/howto-data-access.html#howto-configure-jpa-properties

来源：https://stackoverflow.com/questions/37963370/hsql-create-schema-if-not-exists-in-spring-boot-application

标签

java

hibernate

jdbc

spring-boot

hsqldb