org.apache.calcite.adapter.jdbc

Class JdbcTable

java.lang.Object

org.apache.calcite.schema.impl.AbstractTable

org.apache.calcite.adapter.java.AbstractQueryableTable

org.apache.calcite.adapter.jdbc.JdbcTable

All Implemented Interfaces:

ModifiableTable, QueryableTable, ScannableTable, Table, TranslatableTable, Wrapper

public class JdbcTable
extends AbstractQueryableTable
implements TranslatableTable, ScannableTable, ModifiableTable

Queryable that gets its data from a table within a JDBC connection.

The idea is not to read the whole table, however. The idea is to use this as a building block for a query, by applying Queryable operators such as ExtendedEnumerable.where(org.apache.calcite.linq4j.function.Predicate2). The resulting queryable can then be converted to a SQL query, which can be executed efficiently on the JDBC server.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private class	JdbcTable.JdbcTableQueryable<T> Enumerable that returns the contents of a JdbcTable by connecting to the JDBC data source.

Field Summary

Fields

Modifier and Type	Field and Description
private String	jdbcCatalogName
private JdbcSchema	jdbcSchema
private String	jdbcSchemaName
private String	jdbcTableName
private Schema.TableType	jdbcTableType
private RelProtoDataType	protoRowType

Fields inherited from class org.apache.calcite.adapter.java.AbstractQueryableTable

elementType

Constructor Summary

Constructors

Constructor and Description
JdbcTable(JdbcSchema jdbcSchema, String jdbcCatalogName, String jdbcSchemaName, String tableName, Schema.TableType jdbcTableType)

Method Summary

Modifier and Type	Method and Description
<T> Queryable<T>	asQueryable(QueryProvider queryProvider, SchemaPlus schema, String tableName) Converts this table into a Queryable.
private List<Pair<org.apache.calcite.avatica.ColumnMetaData.Rep,Integer>>	fieldClasses(JavaTypeFactory typeFactory)
(package private) SqlString	generateSql()
Schema.TableType	getJdbcTableType() Type of table.
Collection	getModifiableCollection() Returns the modifiable collection.
RelDataType	getRowType(RelDataTypeFactory typeFactory) Returns this table's row type.
Enumerable<Object[]>	scan(DataContext root) Returns an enumerator over the rows in this Table.
(package private) SqlIdentifier	tableName()
TableModify	toModificationRel(RelOptCluster cluster, RelOptTable table, Prepare.CatalogReader catalogReader, RelNode input, TableModify.Operation operation, List<String> updateColumnList, List<RexNode> sourceExpressionList, boolean flattened) Creates a relational expression that modifies this table.
RelNode	toRel(RelOptTable.ToRelContext context, RelOptTable relOptTable) Converts this table into a relational expression.
String	toString()

Methods inherited from class org.apache.calcite.adapter.java.AbstractQueryableTable

getElementType, getExpression

Methods inherited from class org.apache.calcite.schema.impl.AbstractTable

getStatistic, isRolledUp, rolledUpColumnValidInsideAgg, unwrap

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.calcite.schema.QueryableTable

getElementType, getExpression

Methods inherited from interface org.apache.calcite.schema.Table

getStatistic, isRolledUp, rolledUpColumnValidInsideAgg

Field Detail

protoRowType

private RelProtoDataType protoRowType

jdbcSchema

private final JdbcSchema jdbcSchema

jdbcCatalogName

private final String jdbcCatalogName

jdbcSchemaName

private final String jdbcSchemaName

jdbcTableName

private final String jdbcTableName

jdbcTableType

private final Schema.TableType jdbcTableType

Constructor Detail

JdbcTable

JdbcTable(JdbcSchema jdbcSchema,
          String jdbcCatalogName,
          String jdbcSchemaName,
          String tableName,
          Schema.TableType jdbcTableType)

Method Detail

toString

public String toString()

Overrides:

toString in class Object

getJdbcTableType

public Schema.TableType getJdbcTableType()

Description copied from interface: Table

Type of table.

Specified by:

getJdbcTableType in interface Table

Overrides:

getJdbcTableType in class AbstractTable

getRowType

public RelDataType getRowType(RelDataTypeFactory typeFactory)

Description copied from interface: Table

Returns this table's row type.

This is a struct type whose fields describe the names and types of the columns in this table.

The implementer must use the type factory provided. This ensures that the type is converted into a canonical form; other equal types in the same query will use the same object.

Specified by:

getRowType in interface Table

Parameters:

typeFactory - Type factory with which to create the type

Returns:

Row type

fieldClasses

private List<Pair<org.apache.calcite.avatica.ColumnMetaData.Rep,Integer>> fieldClasses(JavaTypeFactory typeFactory)

generateSql

SqlString generateSql()

tableName

SqlIdentifier tableName()

toRel

public RelNode toRel(RelOptTable.ToRelContext context,
                     RelOptTable relOptTable)

Description copied from interface: TranslatableTable

Converts this table into a relational expression.

Specified by:

toRel in interface TranslatableTable

asQueryable

public <T> Queryable<T> asQueryable(QueryProvider queryProvider,
                                    SchemaPlus schema,
                                    String tableName)

Description copied from interface: QueryableTable

Converts this table into a Queryable.

Specified by:

asQueryable in interface QueryableTable

scan

public Enumerable<Object[]> scan(DataContext root)

Description copied from interface: ScannableTable

Returns an enumerator over the rows in this Table. Each row is represented as an array of its column values.

Specified by:

scan in interface ScannableTable

getModifiableCollection

public Collection getModifiableCollection()

Description copied from interface: ModifiableTable

Returns the modifiable collection. Modifying the collection will change the table's contents.

Specified by:

getModifiableCollection in interface ModifiableTable

toModificationRel

public TableModify toModificationRel(RelOptCluster cluster,
                                     RelOptTable table,
                                     Prepare.CatalogReader catalogReader,
                                     RelNode input,
                                     TableModify.Operation operation,
                                     List<String> updateColumnList,
                                     List<RexNode> sourceExpressionList,
                                     boolean flattened)

Description copied from interface: ModifiableTable

Creates a relational expression that modifies this table.

Specified by:

toModificationRel in interface ModifiableTable