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JDBC Driver over YDB Java SDK
package tech.ydb.jdbc.impl;
import java.sql.ResultSet;
import java.sql.RowIdLifetime;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.stream.Collectors;
import javax.annotation.Nullable;
import com.google.common.base.Strings;
import tech.ydb.jdbc.YdbConnection;
import tech.ydb.jdbc.YdbConst;
import tech.ydb.jdbc.YdbDatabaseMetaData;
import tech.ydb.jdbc.YdbDriverInfo;
import tech.ydb.jdbc.YdbTypes;
import tech.ydb.jdbc.common.YdbFunctions;
import tech.ydb.jdbc.context.YdbExecutor;
import tech.ydb.proto.scheme.SchemeOperationProtos;
import tech.ydb.scheme.SchemeClient;
import tech.ydb.scheme.description.ListDirectoryResult;
import tech.ydb.table.Session;
import tech.ydb.table.description.TableColumn;
import tech.ydb.table.description.TableDescription;
import tech.ydb.table.description.TableIndex;
import tech.ydb.table.result.ResultSetReader;
import tech.ydb.table.settings.DescribeTableSettings;
import tech.ydb.table.values.PrimitiveType;
import tech.ydb.table.values.Type;
public class YdbDatabaseMetaDataImpl implements YdbDatabaseMetaData {
private static final Logger LOGGER = Logger.getLogger(YdbDatabaseMetaDataImpl.class.getName());
static final String TABLE = "TABLE";
static final String SYSTEM_TABLE = "SYSTEM TABLE";
private final YdbConnectionImpl connection;
private final YdbTypes types;
private final YdbExecutor executor;
public YdbDatabaseMetaDataImpl(YdbConnectionImpl connection) {
this.connection = Objects.requireNonNull(connection);
this.types = connection.getYdbTypes();
this.executor = new YdbExecutor(LOGGER);
}
@Override
public boolean allProceduresAreCallable() {
return false;
}
@Override
public boolean allTablesAreSelectable() {
return true;
}
@Override
public String getURL() {
return connection.getCtx().getUrl();
}
@Override
public String getUserName() {
return "";
}
@Override
public boolean isReadOnly() throws SQLException {
return connection.isReadOnly();
}
@Override
public boolean nullsAreSortedHigh() {
return true;
}
@Override
public boolean nullsAreSortedLow() {
return false;
}
@Override
public boolean nullsAreSortedAtStart() {
return false;
}
@Override
public boolean nullsAreSortedAtEnd() {
return false;
}
@Override
public String getDatabaseProductName() {
return "YDB";
}
@Override
public String getDatabaseProductVersion() {
return "unspecified"; // TODO: don't know how to get YDB version
}
@Override
public String getDriverName() {
return YdbDriverInfo.DRIVER_NAME;
}
@Override
public String getDriverVersion() {
return YdbDriverInfo.DRIVER_VERSION;
}
@Override
public int getDriverMajorVersion() {
return YdbDriverInfo.DRIVER_MAJOR_VERSION;
}
@Override
public int getDriverMinorVersion() {
return YdbDriverInfo.DRIVER_MINOR_VERSION;
}
@Override
public boolean usesLocalFiles() {
return false;
}
@Override
public boolean usesLocalFilePerTable() {
return false;
}
@Override
public boolean supportsMixedCaseIdentifiers() {
return true;
}
@Override
public boolean storesUpperCaseIdentifiers() {
return false;
}
@Override
public boolean storesLowerCaseIdentifiers() {
return false;
}
@Override
public boolean storesMixedCaseIdentifiers() {
return true;
}
@Override
public boolean supportsMixedCaseQuotedIdentifiers() {
return true;
}
@Override
public boolean storesUpperCaseQuotedIdentifiers() {
return false;
}
@Override
public boolean storesLowerCaseQuotedIdentifiers() {
return false;
}
@Override
public boolean storesMixedCaseQuotedIdentifiers() {
return true;
}
@Override
public String getIdentifierQuoteString() {
return QUOTE_IDENTIFIER;
}
@Override
public String getSQLKeywords() {
return ""; // TODO: unknown?
}
@Override
public String getNumericFunctions() {
return YdbFunctions.NUMERIC_FUNCTIONS;
}
@Override
public String getStringFunctions() {
return YdbFunctions.STRING_FUNCTIONS;
}
@Override
public String getSystemFunctions() {
return YdbFunctions.SYSTEM_FUNCTIONS;
}
@Override
public String getTimeDateFunctions() {
return YdbFunctions.DATETIME_FUNCTIONS;
}
@Override
public String getSearchStringEscape() {
return "\\";
}
@Override
public String getExtraNameCharacters() {
return "";
}
@Override
public boolean supportsAlterTableWithAddColumn() {
return true;
}
@Override
public boolean supportsAlterTableWithDropColumn() {
return true;
}
@Override
public boolean supportsColumnAliasing() {
return true;
}
@Override
public boolean nullPlusNonNullIsNull() {
return true;
}
@Override
public boolean supportsConvert() {
return false; // Probably not
}
@Override
public boolean supportsConvert(int fromType, int toType) {
return false; // Probably not
}
@Override
public boolean supportsTableCorrelationNames() {
return true;
}
@Override
public boolean supportsDifferentTableCorrelationNames() {
return false;
}
@Override
public boolean supportsExpressionsInOrderBy() {
return true;
}
@Override
public boolean supportsOrderByUnrelated() {
return false;
}
@Override
public boolean supportsGroupBy() {
return true;
}
@Override
public boolean supportsGroupByUnrelated() {
return true;
}
@Override
public boolean supportsGroupByBeyondSelect() {
return true;
}
@Override
public boolean supportsLikeEscapeClause() {
return true;
}
@Override
public boolean supportsMultipleResultSets() {
return true;
}
@Override
public boolean supportsMultipleTransactions() {
return true; // multiple transactions in different connections
}
@Override
public boolean supportsNonNullableColumns() {
return false; // not yet
}
@Override
public boolean supportsMinimumSQLGrammar() {
return true; // think so
}
@Override
public boolean supportsCoreSQLGrammar() {
return false; // no
}
@Override
public boolean supportsExtendedSQLGrammar() {
return false; // no
}
@Override
public boolean supportsANSI92EntryLevelSQL() {
return false; // no
}
@Override
public boolean supportsANSI92IntermediateSQL() {
return false; // no
}
@Override
public boolean supportsANSI92FullSQL() {
return false; // no
}
@Override
public boolean supportsIntegrityEnhancementFacility() {
return false; // no
}
@Override
public boolean supportsOuterJoins() {
return true; // yes
}
@Override
public boolean supportsFullOuterJoins() {
return true; // yes
}
@Override
public boolean supportsLimitedOuterJoins() {
return true; // yes
}
@Override
public String getSchemaTerm() {
return "Database";
}
@Override
public String getProcedureTerm() {
return "";
}
@Override
public String getCatalogTerm() {
return "Path";
}
@Override
public boolean isCatalogAtStart() {
return true;
}
@Override
public String getCatalogSeparator() {
return "/";
}
@Override
public boolean supportsSchemasInDataManipulation() {
return false;
}
@Override
public boolean supportsSchemasInProcedureCalls() {
return false;
}
@Override
public boolean supportsSchemasInTableDefinitions() {
return false;
}
@Override
public boolean supportsSchemasInIndexDefinitions() {
return false;
}
@Override
public boolean supportsSchemasInPrivilegeDefinitions() {
return false;
}
@Override
public boolean supportsCatalogsInDataManipulation() {
return true;
}
@Override
public boolean supportsCatalogsInProcedureCalls() {
return true;
}
@Override
public boolean supportsCatalogsInTableDefinitions() {
return true;
}
@Override
public boolean supportsCatalogsInIndexDefinitions() {
return true;
}
@Override
public boolean supportsCatalogsInPrivilegeDefinitions() {
return true;
}
@Override
public boolean supportsPositionedDelete() {
return false; // No
}
@Override
public boolean supportsPositionedUpdate() {
return false; // No
}
@Override
public boolean supportsSelectForUpdate() {
return false; // Pessimistic locks are not supported
}
@Override
public boolean supportsStoredProcedures() {
return false; // not supported
}
@Override
public boolean supportsSubqueriesInComparisons() {
return true;
}
@Override
public boolean supportsSubqueriesInExists() {
return true;
}
@Override
public boolean supportsSubqueriesInIns() {
return true;
}
@Override
public boolean supportsSubqueriesInQuantifieds() {
return true;
}
@Override
public boolean supportsCorrelatedSubqueries() {
return true;
}
@Override
public boolean supportsUnion() {
return false; // only All supported
}
@Override
public boolean supportsUnionAll() {
return true;
}
@Override
public boolean supportsOpenCursorsAcrossCommit() {
return true; // yes
}
@Override
public boolean supportsOpenCursorsAcrossRollback() {
return true; // yes
}
@Override
public boolean supportsOpenStatementsAcrossCommit() {
return true; // yes
}
@Override
public boolean supportsOpenStatementsAcrossRollback() {
return true; // yes
}
@Override
public int getMaxBinaryLiteralLength() {
return YdbConst.MAX_COLUMN_SIZE;
}
@Override
public int getMaxCharLiteralLength() {
return YdbConst.MAX_COLUMN_SIZE;
}
@Override
public int getMaxColumnNameLength() {
return YdbConst.MAX_COLUMN_NAME_LENGTH;
}
@Override
public int getMaxColumnsInGroupBy() {
return YdbConst.MAX_COLUMNS;
}
@Override
public int getMaxColumnsInIndex() {
return YdbConst.MAX_COLUMNS_IN_PRIMARY_KEY;
}
@Override
public int getMaxColumnsInOrderBy() {
return YdbConst.MAX_COLUMNS;
}
@Override
public int getMaxColumnsInSelect() {
return YdbConst.MAX_COLUMNS;
}
@Override
public int getMaxColumnsInTable() {
return YdbConst.MAX_COLUMNS;
}
@Override
public int getMaxConnections() {
return YdbConst.MAX_CONNECTIONS;
}
@Override
public int getMaxCursorNameLength() {
return YdbConst.MAX_ELEMENT_NAME_LENGTH;
}
@Override
public int getMaxIndexLength() {
return YdbConst.MAX_PRIMARY_KEY_SIZE;
}
@Override
public int getMaxSchemaNameLength() {
return YdbConst.MAX_ELEMENT_NAME_LENGTH;
}
@Override
public int getMaxProcedureNameLength() {
return YdbConst.MAX_ELEMENT_NAME_LENGTH;
}
@Override
public int getMaxCatalogNameLength() {
return YdbConst.MAX_ELEMENT_NAME_LENGTH;
}
@Override
public int getMaxRowSize() {
return YdbConst.MAX_ROW_SIZE;
}
@Override
public boolean doesMaxRowSizeIncludeBlobs() {
return true;
}
@Override
public int getMaxStatementLength() {
return YdbConst.MAX_STATEMENT_LENGTH;
}
@Override
public int getMaxStatements() {
return 0; // no limit for statements (statement is opened only in memory)
}
@Override
public int getMaxTableNameLength() {
return YdbConst.MAX_ELEMENT_NAME_LENGTH;
}
@Override
public int getMaxTablesInSelect() {
return 0; // Limit is unknown
}
@Override
public int getMaxUserNameLength() {
return YdbConst.MAX_ELEMENT_NAME_LENGTH;
}
@Override
public int getDefaultTransactionIsolation() {
return YdbConst.TRANSACTION_SERIALIZABLE_READ_WRITE;
}
@Override
public boolean supportsTransactions() {
return true;
}
@Override
public boolean supportsTransactionIsolationLevel(int level) {
switch (level) {
case YdbConst.TRANSACTION_SERIALIZABLE_READ_WRITE:
case YdbConst.ONLINE_CONSISTENT_READ_ONLY:
case YdbConst.ONLINE_INCONSISTENT_READ_ONLY:
case YdbConst.STALE_CONSISTENT_READ_ONLY:
return true;
default:
return false;
}
}
@Override
public boolean supportsDataDefinitionAndDataManipulationTransactions() {
return true; // basically yes, but DDL executed outsize of a transaction
}
@Override
public boolean supportsDataManipulationTransactionsOnly() {
return true; // transaction will be prepared anyway
}
@Override
public boolean dataDefinitionCausesTransactionCommit() {
return false; // DDL outside of transactions
}
@Override
public boolean dataDefinitionIgnoredInTransactions() {
return true; // DDL outside of transactions
}
@Override
public ResultSet getProcedures(String catalog, String schemaPattern, String procedureNamePattern) {
return fromEmptyResultSet(); // Procedures are not supported
}
@Override
public ResultSet getProcedureColumns(String catalog, String schemaPattern, String procedureNamePattern,
String columnNamePattern) {
return fromEmptyResultSet(); // Procedures are not supported
}
@Override
public ResultSet getTables(String catalog, String schemaPattern, String tableNamePattern, String[] types)
throws SQLException {
LOGGER.log(Level.FINE,
"getTables, catalog=[{0}], schemaPattern=[{1}], tableNamePattern=[{2}], types={3}",
new Object[]{catalog, schemaPattern, tableNamePattern, types == null ? "" : Arrays.asList(types)}
);
if (!isMatchedCatalog(catalog)) {
return fromEmptyResultSet();
}
if (!isMatchedSchema(schemaPattern)) {
return fromEmptyResultSet();
}
boolean matchTables;
boolean matchSystemTables;
if (types == null) {
matchTables = true;
matchSystemTables = true;
} else {
Set typesSet = new HashSet<>(Arrays.asList(types));
matchTables = typesSet.contains(TABLE);
matchSystemTables = typesSet.contains(SYSTEM_TABLE);
}
if (!matchTables && !matchSystemTables) {
return fromEmptyResultSet();
}
List> rows = listTables(tableNamePattern).stream()
.map(tableName -> MappingResultSets.stableMap(
"TABLE_CAT", null,
"TABLE_SCHEM", null,
"TABLE_NAME", tableName,
"TABLE_TYPE", getTableType(tableName),
"REMARKS", null,
"TYPE_CAT", null,
"TYPE_SCHEM", null,
"TYPE_NAME", null,
"SELF_REFERENCING_COL_NAME", null,
"REF_GENERATION", null
))
.filter(map -> (matchTables || !TABLE.equals(map.get("TABLE_TYPE"))) &&
(matchSystemTables || !SYSTEM_TABLE.equals(map.get("TABLE_TYPE"))))
.sorted(Comparator
.comparing((Map m) -> (String) m.get("TABLE_TYPE"))
.thenComparing(m -> (String) m.get("TABLE_NAME")))
.collect(Collectors.toList());
return fromRows(rows);
}
private String getTableType(String tableName) {
if (tableName.startsWith(".sys/") || tableName.startsWith(".sys_health/")) {
return SYSTEM_TABLE;
}
return TABLE;
}
@Override
public ResultSet getSchemas() {
return getSchemas(null, null);
}
@Override
public ResultSet getCatalogs() {
return fromEmptyResultSet(); // Does not support catalogs, all table names has full catalog prefix
}
@Override
public ResultSet getTableTypes() {
return fromRows(Arrays.asList(
Collections.singletonMap("TABLE_TYPE", TABLE),
Collections.singletonMap("TABLE_TYPE", SYSTEM_TABLE)
));
}
@Override
public ResultSet getColumns(String catalog, String schemaPattern, String tableNamePattern,
String columnNamePattern) throws SQLException {
LOGGER.log(Level.FINE,
"getColumns, catalog=[{0}], schemaPattern=[{1}], tableNamePattern=[{2}], columnNamePattern=[{3}]",
new Object[]{catalog, schemaPattern, tableNamePattern, columnNamePattern}
);
if (!isMatchedCatalog(catalog)) {
return fromEmptyResultSet();
}
if (!isMatchedSchema(schemaPattern)) {
return fromEmptyResultSet();
}
Predicate columnFilter = equalsFilter(columnNamePattern);
return fromTables(tableNamePattern,
(tableName, tableDesc, rows) -> {
short index = 0;
for (TableColumn column : tableDesc.getColumns()) {
index++;
if (!columnFilter.test(column.getName())) {
continue;
}
Type type = column.getType();
int nullable;
if (type.getKind() == Type.Kind.OPTIONAL) {
nullable = columnNullable;
type = type.unwrapOptional();
} else {
nullable = columnNoNulls;
}
rows.add(MappingResultSets.stableMap(
"TABLE_CAT", null,
"TABLE_SCHEM", null,
"TABLE_NAME", tableName,
"COLUMN_NAME", column.getName(),
"DATA_TYPE", types.toSqlType(type),
"TYPE_NAME", type.toString(),
"COLUMN_SIZE", types.getSqlPrecision(type),
"BUFFER_LENGTH", 0,
"DECIMAL_DIGITS", (short)(type.getKind() == Type.Kind.DECIMAL ?
YdbConst.SQL_DECIMAL_DEFAULT_PRECISION :
0),
"NUM_PREC_RADIX", 10,
"NULLABLE", nullable,
"REMARKS", null,
"COLUMN_DEF", null, // no default values
"SQL_DATA_TYPE", 0,
"SQL_DATETIME_SUB", 0,
"CHAR_OCTET_LENGTH", 0, // unsupported yet
"ORDINAL_POSITION", index,
"IS_NULLABLE", "YES",
"SCOPE_CATALOG", null,
"SCOPE_SCHEMA", null,
"SCOPE_TABLE", null,
"SOURCE_DATA_TYPE", (short) 0,
"IS_AUTOINCREMENT", "NO", // no auto increments
"IS_GENERATEDCOLUMN", "NO" // no generated columns
));
}
},
Comparator
.comparing((Map m) -> (String) m.get("TABLE_NAME"))
.thenComparingInt(m -> (Short) m.get("ORDINAL_POSITION")));
}
@Override
public ResultSet getColumnPrivileges(String catalog, String schema, String table, String columnNamePattern) {
return fromEmptyResultSet(); // No column-based privileges supported
}
@Override
public ResultSet getTablePrivileges(String catalog, String schemaPattern, String tableNamePattern) {
return fromEmptyResultSet(); // Unable to collect privileges
}
@Override
public ResultSet getBestRowIdentifier(String catalog, String schema, String table, int scope, boolean nullable)
throws SQLException {
LOGGER.log(Level.FINE,
"getBestRowIdentifier, catalog=[{0}], schema=[{1}], table=[{2}], scope=[{3}], nullable=[{4}]",
new Object[]{catalog, schema, table, scope, nullable}
);
if (!isMatchedCatalog(catalog)) {
return fromEmptyResultSet();
}
if (!isMatchedSchema(schema)) {
return fromEmptyResultSet();
}
if (isMatchedAny(table)) {
return fromEmptyResultSet(); // must be table name
}
if (!nullable) {
return fromEmptyResultSet();
}
// Only primary keys could be used as row identifiers
return fromTables(table,
(tableName, tableDesc, rows) -> {
Map columnMap = tableDesc.getColumns().stream()
.collect(Collectors.toMap(TableColumn::getName, Function.identity()));
for (String key : tableDesc.getPrimaryKeys()) {
TableColumn column = columnMap.get(key);
Type type = column.getType();
if (type.getKind() == Type.Kind.OPTIONAL) {
type = type.unwrapOptional();
}
rows.add(MappingResultSets.stableMap(
"SCOPE", (short)scope,
"COLUMN_NAME", key,
"DATA_TYPE", types.toSqlType(type),
"TYPE_NAME", type.toString(),
"COLUMN_SIZE", 0,
"BUFFER_LENGTH", 0,
"DECIMAL_DIGITS", (short) 0, // unknown
"PSEUDO_COLUMN", bestRowNotPseudo));
}
},
Comparator.comparing(m -> (Short) m.get("SCOPE")));
}
@Override
public ResultSet getVersionColumns(String catalog, String schema, String table) {
return fromEmptyResultSet(); // Version columns are not supported
}
@Override
public ResultSet getPrimaryKeys(String catalog, String schema, String table) throws SQLException {
LOGGER.log(Level.FINE, "getPrimaryKeys, catalog=[{0}], schema=[{1}], table=[{2}]", new Object[]{
catalog, schema, table
});
if (!isMatchedCatalog(catalog)) {
return fromEmptyResultSet();
}
if (!isMatchedSchema(schema)) {
return fromEmptyResultSet();
}
if (isMatchedAny(table)) {
return fromEmptyResultSet();
}
return fromTables(table,
(tableName, tableDesc, rows) -> {
short index = 0;
for (String key : tableDesc.getPrimaryKeys()) {
index++;
rows.add(MappingResultSets.stableMap(
"TABLE_CAT", null,
"TABLE_SCHEM", null,
"TABLE_NAME", tableName,
"COLUMN_NAME", key,
"KEY_SEQ", index,
"PK_NAME", null));
}
},
Comparator.comparing(m -> (String) m.get("COLUMN_NAME")));
}
@Override
public ResultSet getImportedKeys(String catalog, String schema, String table) {
return fromEmptyResultSet(); // Foreign keys are not supported
}
@Override
public ResultSet getExportedKeys(String catalog, String schema, String table) {
return fromEmptyResultSet(); // Foreign keys are not supported
}
@Override
public ResultSet getCrossReference(String parentCatalog, String parentSchema, String parentTable,
String foreignCatalog, String foreignSchema, String foreignTable) {
return fromEmptyResultSet(); // Foreign keys are not supported
}
@Override
public ResultSet getTypeInfo() {
List> rows = types.getAllDatabaseTypes().stream()
.map(type -> {
String literal = getLiteral(type);
int scale = type.getKind() == Type.Kind.DECIMAL ? YdbConst.SQL_DECIMAL_DEFAULT_SCALE : 0;
return MappingResultSets.stableMap(
"TYPE_NAME", type.toString(),
"DATA_TYPE", types.toSqlType(type),
"PRECISION", types.getSqlPrecision(type),
"LITERAL_PREFIX", literal,
"LITERAL_SUFFIX", literal,
"CREATE_PARAMS", null,
"NULLABLE", typeNullable,
"CASE_SENSITIVE", true,
"SEARCHABLE", getSearchable(type),
"UNSIGNED_ATTRIBUTE", getUnsigned(type),
"FIXED_PREC_SCALE", type.getKind() == Type.Kind.DECIMAL,
"AUTO_INCREMENT", false, // no auto-increments
"LOCAL_TYPE_NAME", null,
"MINIMUM_SCALE", scale,
"MAXIMUM_SCALE", scale,
"SQL_DATA_TYPE", 0,
"SQL_DATETIME_SUB", 0,
"NUM_PREC_RADIX", 10
);
})
.sorted(Comparator.comparing((Map m) -> (Integer) m.get("DATA_TYPE")))
.collect(Collectors.toList());
return fromRows(rows);
}
private short getSearchable(Type type) {
if (type.getKind() == Type.Kind.PRIMITIVE) {
switch ((PrimitiveType) type) {
case Json:
case JsonDocument:
case Yson:
return typePredNone;
case Bytes:
case Text:
return typeSearchable;
default:
return typePredBasic;
}
} else {
return typePredBasic;
}
}
private boolean getUnsigned(Type type) {
if (type.getKind() == Type.Kind.PRIMITIVE) {
switch ((PrimitiveType) type) {
case Uint8:
case Uint16:
case Uint32:
case Uint64:
return true;
default:
//
}
}
return false;
}
@Nullable
private String getLiteral(Type type) {
if (type.getKind() == Type.Kind.PRIMITIVE) {
switch ((PrimitiveType) type) {
case Bytes:
case Text:
case Json:
case JsonDocument:
case Yson:
return "'";
}
}
return null;
}
@Override
public ResultSet getIndexInfo(String catalog, String schema, String table, boolean unique, boolean approximate)
throws SQLException {
LOGGER.log(Level.FINE,
"getIndexInfo, catalog=[{0}], schema=[{1}], table=[{2}], unique=[{3}], approximate=[{4}]",
new Object[]{catalog, schema, table, unique, approximate}
);
if (!isMatchedCatalog(catalog)) {
return fromEmptyResultSet();
}
if (!isMatchedSchema(schema)) { // not exactly the same schema
return fromEmptyResultSet();
}
if (isMatchedAny(table)) {
return fromEmptyResultSet(); // must be table name
}
if (unique) {
return fromEmptyResultSet();
}
return fromTables(table,
(tableName, tableDesc, rows) -> {
for (TableIndex tableIndex : tableDesc.getIndexes()) {
short index = 0;
for (String column : tableIndex.getColumns()) {
index++;
rows.add(MappingResultSets.stableMap(
"TABLE_CAT", null,
"TABLE_SCHEM", null,
"TABLE_NAME", tableName,
"NON_UNIQUE", true,
"INDEX_QUALIFIER", null,
"INDEX_NAME", tableIndex.getName(),
"TYPE", tableIndexHashed, // just an index?
"ORDINAL_POSITION", index,
"COLUMN_NAME", column,
"ASC_OR_DESC", null, // unknown sort sequence?
"CARDINALITY", 0,
"PAGES", 0,
"FILTER_CONDITION", null));
}
}
},
Comparator
.comparing((Map m) -> (Boolean) m.get("NON_UNIQUE"))
.thenComparing(m -> (Short) m.get("TYPE"))
.thenComparing(m -> (String) m.get("INDEX_NAME"))
.thenComparing(m -> (Short) m.get("ORDINAL_POSITION")));
}
@Override
public boolean supportsResultSetType(int type) {
return type == ResultSet.TYPE_FORWARD_ONLY || type == ResultSet.TYPE_SCROLL_INSENSITIVE;
}
@Override
public boolean supportsResultSetConcurrency(int type, int concurrency) {
return (type == ResultSet.TYPE_FORWARD_ONLY || type == ResultSet.TYPE_SCROLL_INSENSITIVE) &&
concurrency == ResultSet.CONCUR_READ_ONLY;
}
@Override
public boolean ownUpdatesAreVisible(int type) {
return false; // cursor updates not supported
}
@Override
public boolean ownDeletesAreVisible(int type) {
return false; // cursor updates not supported
}
@Override
public boolean ownInsertsAreVisible(int type) {
return false; // cursor updates not supported
}
@Override
public boolean othersUpdatesAreVisible(int type) {
return false; // cursor updates not supported
}
@Override
public boolean othersDeletesAreVisible(int type) {
return false; // cursor updates not supported
}
@Override
public boolean othersInsertsAreVisible(int type) {
return false; // cursor updates not supported
}
@Override
public boolean updatesAreDetected(int type) {
return false; // cursor updates not supported
}
@Override
public boolean deletesAreDetected(int type) {
return false; // cursor updates not supported
}
@Override
public boolean insertsAreDetected(int type) {
return false; // cursor updates not supported
}
@Override
public boolean supportsBatchUpdates() {
return true; // yes, but with special form of a batch
}
@Override
public ResultSet getUDTs(String catalog, String schemaPattern, String typeNamePattern, int[] types) {
return fromEmptyResultSet(); // UDTs are not supported
}
@Override
public YdbConnection getConnection() {
return connection;
}
@Override
public boolean supportsSavepoints() {
return false; // savepoints are not supported
}
@Override
public boolean supportsNamedParameters() {
return false; // callables are not supported
}
@Override
public boolean supportsMultipleOpenResults() {
return false; // callables are not supported
}
@Override
public boolean supportsGetGeneratedKeys() {
return false; // generated keys are not supported
}
@Override
public ResultSet getSuperTypes(String catalog, String schemaPattern, String typeNamePattern) {
return fromEmptyResultSet(); // UDTs are not supported
}
@Override
public ResultSet getSuperTables(String catalog, String schemaPattern, String tableNamePattern) {
return fromEmptyResultSet(); // Super-tables are not supported
}
@Override
public ResultSet getAttributes(String catalog, String schemaPattern, String typeNamePattern,
String attributeNamePattern) {
return fromEmptyResultSet(); // UDTss are not supported
}
@Override
public boolean supportsResultSetHoldability(int holdability) {
return holdability == ResultSet.HOLD_CURSORS_OVER_COMMIT;
}
@Override
public int getResultSetHoldability() throws SQLException {
return connection.getHoldability();
}
@Override
public int getDatabaseMajorVersion() {
return 0; // unknown
}
@Override
public int getDatabaseMinorVersion() {
return 0; // unknown
}
@Override
public int getJDBCMajorVersion() {
return YdbDriverInfo.JDBC_MAJOR_VERSION;
}
@Override
public int getJDBCMinorVersion() {
return YdbDriverInfo.JDBC_MINOR_VERSION;
}
@Override
public int getSQLStateType() {
return sqlStateSQL;
}
@Override
public boolean locatorsUpdateCopy() {
return false; // ?
}
@Override
public boolean supportsStatementPooling() {
return true; // looks so
}
@Override
public RowIdLifetime getRowIdLifetime() {
return RowIdLifetime.ROWID_UNSUPPORTED;
}
@Override
public ResultSet getSchemas(String catalog, String schemaPattern) {
return fromEmptyResultSet();
}
@Override
public boolean supportsStoredFunctionsUsingCallSyntax() {
return false; // Calls are not supported
}
@Override
public boolean autoCommitFailureClosesAllResultSets() {
return false; // All result sets still opened
}
@Override
public ResultSet getClientInfoProperties() {
return fromEmptyResultSet(); // No client info getOperationProperties?
}
@Override
public ResultSet getFunctions(String catalog, String schemaPattern, String functionNamePattern) {
return fromEmptyResultSet(); // Custom functions are not supported
}
@Override
public ResultSet getFunctionColumns(String catalog, String schemaPattern, String functionNamePattern,
String columnNamePattern) {
return fromEmptyResultSet(); // Custom functions are not supported
}
@Override
public ResultSet getPseudoColumns(String catalog, String schemaPattern, String tableNamePattern,
String columnNamePattern) {
return fromEmptyResultSet(); // Pseudo columns are not supported
}
@Override
public boolean generatedKeyAlwaysReturned() {
return false; // No generated keys
}
@Override
public T unwrap(Class iface) throws SQLException {
if (iface.isAssignableFrom(getClass())) {
return iface.cast(this);
}
throw new SQLException(YdbConst.CANNOT_UNWRAP_TO + iface);
}
@Override
public boolean isWrapperFor(Class iface) {
return iface.isAssignableFrom(getClass());
}
private Map collectTableDescriptions(Session session, Collection tables) throws SQLException {
DescribeTableSettings settings = connection.withDefaultTimeout(new DescribeTableSettings());
String databaseWithSuffix = withSuffix(connection.getCtx().getDatabase());
Map target = new LinkedHashMap<>(tables.size());
for (String table: tables) {
target.put(table, executor.call("Get table description for " + table,
() -> session.describeTable(databaseWithSuffix + table, settings)
));
}
return target;
}
private Collection listTables(String tableNamePattern) throws SQLException {
Predicate filter = equalsFilter(tableNamePattern);
Collection allTables = listTables(filter);
LOGGER.log(Level.FINE, "Loaded {0} tables...", allTables.size());
return allTables;
}
private Collection listTables(Predicate filter) throws SQLException {
String databaseWithSuffix = withSuffix(connection.getCtx().getDatabase());
return tables(databaseWithSuffix, databaseWithSuffix, filter);
}
private List tables(String databasePrefix, String path, Predicate filter) throws SQLException {
SchemeClient client = connection.getCtx().getSchemeClient();
ListDirectoryResult result = executor.call("List tables from " + path, () -> client.listDirectory(path));
List tables = new ArrayList<>();
String pathPrefix = withSuffix(path);
for (SchemeOperationProtos.Entry entry : result.getChildren()) {
String tableName = entry.getName();
String fullPath = pathPrefix + tableName;
String tablePath = fullPath.substring(databasePrefix.length());
switch (entry.getType()) {
case TABLE:
if (filter.test(tablePath)) {
tables.add(tablePath);
}
break;
case DIRECTORY:
tables.addAll(tables(databasePrefix, fullPath, filter));
break;
default:
// skip
}
}
return tables;
}
private ResultSet fromTables(String tableNamePattern,
TableCollector tableCollector,
Comparator> comparator) throws SQLException {
Collection tables = listTables(tableNamePattern);
if (tables.isEmpty()) {
return fromEmptyResultSet();
}
try (Session session = executor.createSession(connection.getCtx())) {
Map tableMap = collectTableDescriptions(session, tables);
List> rows = new ArrayList<>(tableMap.size() * 16);
for (Map.Entry entry : tableMap.entrySet()) {
tableCollector.collect(entry.getKey(), entry.getValue(), rows);
}
rows.sort(comparator);
return fromRows(rows);
}
}
private ResultSet fromEmptyResultSet() {
YdbStatementImpl statement = new YdbStatementImpl(connection, ResultSet.TYPE_SCROLL_INSENSITIVE);
ResultSetReader reader = MappingResultSets.emptyReader();
return new YdbResultSetImpl(statement, reader);
}
private ResultSet fromRows(List> rows) {
YdbStatementImpl statement = new YdbStatementImpl(connection, ResultSet.TYPE_SCROLL_INSENSITIVE);
ResultSetReader reader = MappingResultSets.readerFromList(rows);
return new YdbResultSetImpl(statement, reader);
}
private boolean isMatchedCatalog(String catalog) {
return isMatchedAny(catalog);
}
private boolean isMatchedSchema(String schema) throws SQLException {
return isMatchedAny(schema) || Objects.equals(withSuffix(schema), withSuffix(connection.getSchema()));
}
private static boolean isMatchedAny(String filter) {
return Strings.isNullOrEmpty(filter) || filter.equals("%");
}
private static Predicate equalsFilter(String name) {
if (isMatchedAny(name)) {
return table -> true;
} else {
return name::equals;
}
}
static String withSuffix(String prefix) {
return prefix == null || prefix.endsWith("/") ? prefix : prefix + "/";
}
interface TableCollector {
void collect(String tableName, TableDescription tableDescription, List> rows);
}
}