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java.lang.Object
org.hibernate.dialect.Dialect
org.hibernate.dialect.SybaseDialect
org.hibernate.dialect.SQLServerDialect
public class SQLServerDialect
extends SybaseDialect
Field Summary |
Fields inherited from class org.hibernate.dialect.Dialect | |
CLOSED_QUOTE , DEFAULT_BATCH_SIZE , NO_BATCH , QUOTE |
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public String appendIdentitySelectToInsert(String insertSQL)
Use insert table(...) values(...) select SCOPE_IDENTITY()
- Overrides:
- appendIdentitySelectToInsert in interface SybaseDialect
public String appendLockHint(LockMode mode, String tableName)
Some dialects support an alternative means to SELECT FOR UPDATE, whereby a "lock hint" is appends to the table name in the from clause. contributed by Helge Schulz
- Overrides:
- appendLockHint in interface SybaseDialect
- Parameters:
mode
- The lock mode to applytableName
- The name of the table to which to apply the lock hint.
- Returns:
- The table with any required lock hints.
public boolean areStringComparisonsCaseInsensitive()
Are string comparisons implicitly case insensitive. In other words, does [where 'XYZ' = 'xyz'] resolve to true?
- Overrides:
- areStringComparisonsCaseInsensitive in interface Dialect
- Returns:
- True if comparisons are case insensitive.
- Since:
- 3.2
public char closeQuote()
The character specific to this dialect used to close a quoted identifier.
- Overrides:
- closeQuote in interface Dialect
- Returns:
- The dialect's specific close quote character.
public boolean doesReadCommittedCauseWritersToBlockReaders()
For the underlying database, is READ_COMMITTED isolation implemented by forcing readers to wait for write locks to be released?
- Overrides:
- doesReadCommittedCauseWritersToBlockReaders in interface SybaseDialect
- Returns:
- True if writers block readers to achieve READ_COMMITTED; false otherwise.
public boolean doesRepeatableReadCauseReadersToBlockWriters()
For the underlying database, is REPEATABLE_READ isolation implemented by forcing writers to wait for read locks to be released?
- Overrides:
- doesRepeatableReadCauseReadersToBlockWriters in interface SybaseDialect
- Returns:
- True if readers block writers to achieve REPEATABLE_READ; false otherwise.
public String getCurrentTimestampSelectString()
Retrieve the command used to retrieve the current timestammp from the database.
- Overrides:
- getCurrentTimestampSelectString in interface SybaseDialect
- Returns:
- The command.
public String getLimitString(String querySelect, int offset, int limit)
Given a limit and an offset, apply the limit clause to the query.
- Overrides:
- getLimitString in interface Dialect
- Parameters:
offset
- The offset of the limitlimit
- The limit of the limit ;)
- Returns:
- The modified query statement with the limit applied.
public String getNoColumnsInsertString()
The fragment used to insert a row without specifying any column values. This is not possible on some databases.
- Overrides:
- getNoColumnsInsertString in interface Dialect
- Returns:
- The appropriate empty values clause.
public String getSelectGUIDString()
Get the command used to select a GUID from the underlying database. Optional operation.
- Overrides:
- getSelectGUIDString in interface Dialect
- Returns:
- The appropriate command.
public char openQuote()
The character specific to this dialect used to begin a quoted identifier.
- Returns:
- The dialect's specific open quote character.
public boolean supportsCircularCascadeDeleteConstraints()
Does this dialect support definition of cascade delete constraints which can cause circular chains?
- Overrides:
- supportsCircularCascadeDeleteConstraints in interface Dialect
- Returns:
- True if circular cascade delete constraints are supported; false otherwise.
- Since:
- 3.2
public boolean supportsLimit()
Does this dialect support some form of limiting query results via a SQL clause?
- Overrides:
- supportsLimit in interface Dialect
- Returns:
- True if this dialect supports some form of LIMIT.
public boolean supportsLimitOffset()
Does this dialect's LIMIT support (if any) additionally support specifying an offset?
- Overrides:
- supportsLimitOffset in interface Dialect
- Returns:
- True if the dialect supports an offset within the limit support.
public boolean supportsLobValueChangePropogation()
Does the dialect support propogating changes to LOB values back to the database? Talking about mutating the internal value of the locator as opposed to supplying a new locator instance... For BLOBs, the internal value might be changed by:java.sql.Blob.setBinaryStream
,java.sql.Blob.setBytes(long, byte[])
,java.sql.Blob.setBytes(long, byte[], int, int)
, orjava.sql.Blob.truncate(long)
. For CLOBs, the internal value might be changed by:java.sql.Clob.setAsciiStream(long)
,java.sql.Clob.setCharacterStream(long)
,java.sql.Clob.setString(long, String)
,java.sql.Clob.setString(long, String, int, int)
, orjava.sql.Clob.truncate(long)
. NOTE : I do not know the correct answer currently for databases which (1) are not part of the cruise control process or (2) do notDialect.supportsExpectedLobUsagePattern()
.
- Overrides:
- supportsLobValueChangePropogation in interface Dialect
- Returns:
- True if the changes are propogated back to the database; false otherwise.
- Since:
- 3.2
public boolean supportsResultSetPositionQueryMethodsOnForwardOnlyCursor()
Does this dialect support asking the result set its positioning information on forward only cursors. Specifically, in the case of scrolling fetches, Hibernate needs to usejava.sql.ResultSet.isAfterLast
andjava.sql.ResultSet.isBeforeFirst
. Certain drivers do not allow access to these methods for forward only cursors. NOTE : this is highly driver dependent!
- Overrides:
- supportsResultSetPositionQueryMethodsOnForwardOnlyCursor in interface Dialect
- Returns:
- True if methods like
java.sql.ResultSet.isAfterLast
andjava.sql.ResultSet.isBeforeFirst
are supported for forward only cursors; false otherwise.
- Since:
- 3.2
public boolean supportsVariableLimit()
Does this dialect support bind variables (i.e., prepared statememnt parameters) for its limit/offset?
- Overrides:
- supportsVariableLimit in interface Dialect
- Returns:
- True if bind variables can be used; false otherwise.
public boolean useMaxForLimit()
Does the LIMIT clause take a "maximum" row number instead of a total number of returned rows? This is easiest understood via an example. Consider you have a table with 20 rows, but you only want to retrieve rows number 11 through 20. Generally, a limit with offset would say that the offset = 11 and the limit = 10 (we only want 10 rows at a time); this is specifying the total number of returned rows. Some dialects require that we instead specify offset = 11 and limit = 20, where 20 is the "last" row we want relative to offset (i.e. total number of rows = 20 - 11 = 9) So essentially, is limit relative from offset? Or is limit absolute?
- Overrides:
- useMaxForLimit in interface Dialect
- Returns:
- True if limit is relative from offset; false otherwise.