H2Utils (Ignite 2.7.2-p3)

java.lang.Object
- org.apache.ignite.internal.processors.query.h2.H2Utils

```
public class H2Utils
extends Object
```
H2 utility methods.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static boolean`	`containsColumn(List<IndexColumn> cols, IndexColumn col)`
`static boolean`	`containsKeyColumn(GridH2RowDescriptor desc, List<IndexColumn> cols)` Check whether columns list contains key or key alias column.
`static Object`	`convert(Object val, GridH2RowDescriptor desc, int type)` Convert value to column's expected type by means of H2.
`static GridH2IndexBase`	`createSpatialIndex(GridH2Table tbl, String idxName, IndexColumn[] cols)` Create spatial index.
`static boolean`	`equals(IndexColumn c1, IndexColumn c2)`
`static String`	`indexCreateSql(String fullTblName, GridH2IndexBase h2Idx, boolean ifNotExists)` Generate `CREATE INDEX` SQL statement for given params.
`static String`	`indexDropSql(String schemaName, String idxName, boolean ifExists)` Generate `CREATE INDEX` SQL statement for given params.
`static List<GridQueryFieldMetadata>`	`meta(ResultSetMetaData rsMeta)`
`static Session`	`session(Connection c)`
`static void`	`setupConnection(Connection conn, boolean distributedJoins, boolean enforceJoinOrder)`
`static List<IndexColumn>`	`treeIndexColumns(GridH2RowDescriptor desc, List<IndexColumn> cols, IndexColumn keyCol, IndexColumn affCol)`
`static String`	`withQuotes(String str)` Add quotes around the name.
`static <any>`	`zeroCursor()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

equals

public static boolean equals(IndexColumn c1,
                             IndexColumn c2)

Parameters:: c1 - First column.; c2 - Second column.
Returns:: true If they are the same.

containsColumn

public static boolean containsColumn(List<IndexColumn> cols,
                                     IndexColumn col)

Parameters:: cols - Columns list.; col - Column to find.
Returns:: true If found.

containsKeyColumn

public static boolean containsKeyColumn(GridH2RowDescriptor desc,
                                        List<IndexColumn> cols)

Check whether columns list contains key or key alias column.

Parameters:: desc - Row descriptor.; cols - Columns list.
Returns:: Result.

indexCreateSql

public static String indexCreateSql(String fullTblName,
                                    GridH2IndexBase h2Idx,
                                    boolean ifNotExists)

Generate CREATE INDEX SQL statement for given params.

Parameters:: fullTblName - Fully qualified table name.; h2Idx - H2 index.; ifNotExists - Quietly skip index creation if it exists.
Returns:: Statement string.

indexDropSql

public static String indexDropSql(String schemaName,
                                  String idxName,
                                  boolean ifExists)

Generate CREATE INDEX SQL statement for given params.

Parameters:: schemaName - Quoted schema name.; idxName - Index name.; ifExists - Quietly skip index drop if it exists.
Returns:: Statement string.

treeIndexColumns

public static List<IndexColumn> treeIndexColumns(GridH2RowDescriptor desc,
                                                 List<IndexColumn> cols,
                                                 IndexColumn keyCol,
                                                 IndexColumn affCol)

Parameters:: desc - Row descriptor.; cols - Columns list.; keyCol - Primary key column.; affCol - Affinity key column.
Returns:: The same list back.

createSpatialIndex

public static GridH2IndexBase createSpatialIndex(GridH2Table tbl,
                                                 String idxName,
                                                 IndexColumn[] cols)

Create spatial index.

Parameters:: tbl - Table.; idxName - Index name.; cols - Columns.

withQuotes
```
public static String withQuotes(String str)
```
Add quotes around the name.

Parameters:

str - String.

Returns:

String with quotes.

session

public static Session session(Connection c)

Parameters:: c - Connection.
Returns:: Session.

setupConnection

public static void setupConnection(Connection conn,
                                   boolean distributedJoins,
                                   boolean enforceJoinOrder)

Parameters:: conn - Connection to use.; distributedJoins - If distributed joins are enabled.; enforceJoinOrder - Enforce join order of tables.

convert

public static Object convert(Object val,
                             GridH2RowDescriptor desc,
                             int type)
                      throws IgniteCheckedException

Convert value to column's expected type by means of H2.

Parameters:: val - Source value.; desc - Row descriptor.; type - Expected column type to convert to.
Returns:: Converted object.
Throws:: IgniteCheckedException - if failed.

zeroCursor
```
public static <any> zeroCursor()
```
Returns:

Single-column, single-row cursor with 0 as number of updated records.

Class H2Utils