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48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
#include <DB/Columns/ColumnString.h>
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#include <DB/DataTypes/DataTypeString.h>
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#include <DB/DataStreams/OneBlockInputStream.h>
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#include <DB/Storages/StorageSystemDatabases.h>
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namespace DB
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{
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StorageSystemDatabases::StorageSystemDatabases(const std::string & name_, const Context & context_)
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: name(name_), context(context_)
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{
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columns.push_back(NameAndTypePair("name", new DataTypeString));
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}
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StoragePtr StorageSystemDatabases::create(const std::string & name_, const Context & context_)
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{
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return (new StorageSystemDatabases(name_, context_))->thisPtr();
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}
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BlockInputStreams StorageSystemDatabases::read(
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const Names & column_names, ASTPtr query, const Settings & settings,
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QueryProcessingStage::Enum & processed_stage, size_t max_block_size, unsigned threads)
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{
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check(column_names);
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processed_stage = QueryProcessingStage::FetchColumns;
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Block block;
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ColumnWithNameAndType col_name;
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col_name.name = "name";
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col_name.type = new DataTypeString;
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col_name.column = new ColumnString;
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block.insert(col_name);
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Poco::ScopedLock<Poco::Mutex> lock(context.getMutex());
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for (Databases::const_iterator it = context.getDatabases().begin(); it != context.getDatabases().end(); ++it)
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col_name.column->insert(it->first);
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return BlockInputStreams(1, new OneBlockInputStream(block));
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}
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}
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