org.apache.spark.sql.jdbc

Class JdbcSQLQueryBuilder

Object

org.apache.spark.sql.jdbc.JdbcSQLQueryBuilder

Direct Known Subclasses:

DB2Dialect.DB2SQLQueryBuilder, MsSqlServerDialect.MsSqlServerSQLQueryBuilder, MySQLDialect.MySQLSQLQueryBuilder, OracleDialect.OracleSQLQueryBuilder

public class JdbcSQLQueryBuilder
extends Object

The builder to build a single SELECT query.

Note: All the withXXX methods will be invoked at most once. The invocation order does not matter, as all these clauses follow the natural SQL order: sample the table first, then filter, then group by, then sort, then offset, then limit.

Since:

3.5.0

Constructor Summary

Constructors

Constructor and Description
JdbcSQLQueryBuilder(JdbcDialect dialect, org.apache.spark.sql.execution.datasources.jdbc.JDBCOptions options)

Method Summary

Modifier and Type	Method and Description
String	build() Build the final SQL query that following dialect's SQL syntax.
JdbcSQLQueryBuilder	withColumns(String[] columns) The columns names that following dialect's SQL syntax.
JdbcSQLQueryBuilder	withGroupByColumns(String[] groupByColumns) Constructs the GROUP BY clause that following dialect's SQL syntax.
JdbcSQLQueryBuilder	withLimit(int limit) Saves the limit value used to construct LIMIT clause.
JdbcSQLQueryBuilder	withOffset(int offset) Saves the offset value used to construct OFFSET clause.
JdbcSQLQueryBuilder	withPredicates(Predicate[] predicates, org.apache.spark.sql.execution.datasources.jdbc.JDBCPartition part) Constructs the WHERE clause that following dialect's SQL syntax.
JdbcSQLQueryBuilder	withSortOrders(String[] sortOrders) Constructs the ORDER BY clause that following dialect's SQL syntax.
JdbcSQLQueryBuilder	withTableSample(org.apache.spark.sql.execution.datasources.v2.TableSampleInfo sample) Constructs the table sample clause that following dialect's SQL syntax.

Methods inherited from class Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JdbcSQLQueryBuilder

public JdbcSQLQueryBuilder(JdbcDialect dialect,
                           org.apache.spark.sql.execution.datasources.jdbc.JDBCOptions options)

Method Detail

build

public String build()

Build the final SQL query that following dialect's SQL syntax.

Returns:

(undocumented)

withColumns

public JdbcSQLQueryBuilder withColumns(String[] columns)

The columns names that following dialect's SQL syntax. e.g. The column name is the raw name or quoted name.

Parameters:

columns - (undocumented)

Returns:

(undocumented)

withGroupByColumns

public JdbcSQLQueryBuilder withGroupByColumns(String[] groupByColumns)

Constructs the GROUP BY clause that following dialect's SQL syntax.

Parameters:

groupByColumns - (undocumented)

Returns:

(undocumented)

withLimit

public JdbcSQLQueryBuilder withLimit(int limit)

Saves the limit value used to construct LIMIT clause.

Parameters:

limit - (undocumented)

Returns:

(undocumented)

withOffset

public JdbcSQLQueryBuilder withOffset(int offset)

Saves the offset value used to construct OFFSET clause.

Parameters:

offset - (undocumented)

Returns:

(undocumented)

withPredicates

public JdbcSQLQueryBuilder withPredicates(Predicate[] predicates,
                                          org.apache.spark.sql.execution.datasources.jdbc.JDBCPartition part)

Constructs the WHERE clause that following dialect's SQL syntax.

Parameters:

predicates - (undocumented)

part - (undocumented)

Returns:

(undocumented)

withSortOrders

public JdbcSQLQueryBuilder withSortOrders(String[] sortOrders)

Constructs the ORDER BY clause that following dialect's SQL syntax.

Parameters:

sortOrders - (undocumented)

Returns:

(undocumented)

withTableSample

public JdbcSQLQueryBuilder withTableSample(org.apache.spark.sql.execution.datasources.v2.TableSampleInfo sample)

Constructs the table sample clause that following dialect's SQL syntax.

Parameters:

sample - (undocumented)

Returns:

(undocumented)