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Support SHOW VARIABLES LIKE 'lower_case_%' #12027

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Aug 26, 2021
Merged

Support SHOW VARIABLES LIKE 'lower_case_%' #12027

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19 changes: 15 additions & 4 deletions ...org/apache/shardingsphere/proxy/backend/text/data/impl/UnicastDatabaseBackendHandler.java
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,7 @@

import java.sql.SQLException;
import java.util.Collection;
import java.util.Optional;

/**
* Database backend handler with unicast schema.
Expand All @@ -49,20 +50,30 @@ public final class UnicastDatabaseBackendHandler implements DatabaseBackendHandl

@Override
public ResponseHeader execute() throws SQLException {
String schemaName = null == backendConnection.getSchemaName() ? getFirstSchemaName() : backendConnection.getSchemaName();
String originSchema = backendConnection.getSchemaName();
String schemaName = null == originSchema ? getFirstSchemaName() : originSchema;
if (!ProxyContext.getInstance().getMetaData(schemaName).isComplete()) {
throw new RuleNotExistedException();
}
databaseCommunicationEngine = databaseCommunicationEngineFactory.newTextProtocolInstance(sqlStatementContext, sql, backendConnection);
return databaseCommunicationEngine.execute();
try {
backendConnection.setCurrentSchema(schemaName);
databaseCommunicationEngine = databaseCommunicationEngineFactory.newTextProtocolInstance(sqlStatementContext, sql, backendConnection);
return databaseCommunicationEngine.execute();
} finally {
backendConnection.setCurrentSchema(originSchema);
}
}

private String getFirstSchemaName() {
Collection<String> schemaNames = ProxyContext.getInstance().getAllSchemaNames();
if (schemaNames.isEmpty()) {
throw new NoDatabaseSelectedException();
}
return schemaNames.iterator().next();
Optional<String> result = schemaNames.stream().filter(each -> ProxyContext.getInstance().getMetaData(each).isComplete()).findFirst();
if (!result.isPresent()) {
throw new RuleNotExistedException();
}
return result.get();
}

@Override
Expand Down