spring SqlDialectLookup 源码
springboot SqlDialectLookup 代码
文件路径：/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jooq/SqlDialectLookup.java
/*
* Copyright 2012-2022 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.boot.autoconfigure.jooq;
import java.sql.DatabaseMetaData;
import javax.sql.DataSource;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jooq.SQLDialect;
import org.jooq.tools.jdbc.JDBCUtils;
import org.springframework.jdbc.support.JdbcUtils;
import org.springframework.jdbc.support.MetaDataAccessException;
/**
* Utility to lookup well known {@link SQLDialect SQLDialects} from a {@link DataSource}.
*
* @author Michael Simons
* @author Lukas Eder
*/
final class SqlDialectLookup {
private static final Log logger = LogFactory.getLog(SqlDialectLookup.class);
private SqlDialectLookup() {
}
/**
* Return the most suitable {@link SQLDialect} for the given {@link DataSource}.
* @param dataSource the source {@link DataSource}
* @return the most suitable {@link SQLDialect}
*/
static SQLDialect getDialect(DataSource dataSource) {
if (dataSource == null) {
return SQLDialect.DEFAULT;
}
try {
String url = JdbcUtils.extractDatabaseMetaData(dataSource, DatabaseMetaData::getURL);
SQLDialect sqlDialect = JDBCUtils.dialect(url);
if (sqlDialect != null) {
return sqlDialect;
}
}
catch (MetaDataAccessException ex) {
logger.warn("Unable to determine jdbc url from datasource", ex);
}
return SQLDialect.DEFAULT;
}
}
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- 本文标签： Java Spring Spring Boot
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