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Hibernate 3.2.4 正式版 API 英文文档
MimerSQLDialect (Hibernate API Documentation) - Hibernate 3.2.4 正式版 API 英文文档
org.hibernate.dialect
Class MimerSQLDialect
java.lang.Object
org.hibernate.dialect.Dialect
org.hibernate.dialect.MimerSQLDialect
- public class MimerSQLDialect
- extends Dialect
An Hibernate 3 SQL dialect for Mimer SQL. This dialect requires Mimer SQL 9.2.1 or later
because of the mappings to NCLOB, BINARY, and BINARY VARYING.
- Author:
- Fredrik 舕und
|
Constructor Summary |
MimerSQLDialect()
Even thoug Mimer SQL supports character and binary columns up to 15 000 in lenght,
this is also the maximum width of the table (exluding LOBs). |
| Methods inherited from class org.hibernate.dialect.Dialect |
appendIdentitySelectToInsert, appendLockHint, applyLocksToSql, areStringComparisonsCaseInsensitive, bindLimitParametersFirst, bindLimitParametersInReverseOrder, buildSQLExceptionConverter, closeQuote, createCaseFragment, createOuterJoinFragment, doesReadCommittedCauseWritersToBlockReaders, doesRepeatableReadCauseReadersToBlockWriters, dropTemporaryTableAfterUse, generateTemporaryTableName, getAddForeignKeyConstraintString, getAddPrimaryKeyConstraintString, getCastTypeName, getColumnComment, getCreateMultisetTableString, getCreateSequenceString, getCreateSequenceStrings, getCreateSequenceStrings, getCreateTableString, getCreateTemporaryTablePostfix, getCreateTemporaryTableString, getCurrentTimestampSelectString, getCurrentTimestampSQLFunctionName, getDefaultProperties, getDialect, getDialect, getDropForeignKeyString, getDropSequenceStrings, getForUpdateNowaitString, getForUpdateNowaitString, getForUpdateString, getForUpdateString, getForUpdateString, getFunctions, getHibernateTypeName, getHibernateTypeName, getIdentityColumnString, getIdentityColumnString, getIdentityInsertString, getIdentitySelectString, getIdentitySelectString, getKeywords, getLimitString, getLimitString, getLockingStrategy, getLowercaseFunction, getMaxAliasLength, getNativeIdentifierGeneratorClass, getNoColumnsInsertString, getNullColumnString, getResultSet, getSelectClauseNullString, getSelectGUIDString, getSelectSequenceNextValString, getTableComment, getTableTypeString, getTypeName, getTypeName, getViolatedConstraintNameExtracter, hasAlterTable, hasDataTypeInIdentityColumn, hasSelfReferentialForeignKeyBug, isCurrentTimestampSelectStringCallable, openQuote, performTemporaryTableDDLInIsolation, qualifyIndexName, quote, registerColumnType, registerColumnType, registerFunction, registerHibernateType, registerHibernateType, registerKeyword, registerResultSetOutParameter, supportsBindAsCallableArgument, supportsCascadeDelete, supportsCircularCascadeDeleteConstraints, supportsColumnCheck, supportsCommentOn, supportsCurrentTimestampSelection, supportsEmptyInList, supportsExistsInSelect, supportsExpectedLobUsagePattern, supportsIfExistsAfterTableName, supportsIfExistsBeforeTableName, supportsInsertSelectIdentity, supportsLimitOffset, supportsLobValueChangePropogation, supportsNotNullUnique, supportsParametersInInsertSelect, supportsPooledSequences, supportsResultSetPositionQueryMethodsOnForwardOnlyCursor, supportsRowValueConstructorSyntax, supportsRowValueConstructorSyntaxInInList, supportsSubqueryOnMutatingTable, supportsSubselectAsInPredicateLHS, supportsTableCheck, supportsTemporaryTables, supportsUnboundedLobLocatorMaterialization, supportsUnionAll, supportsUnique, supportsUniqueConstraintInCreateAlterTable, supportsVariableLimit, toBooleanValueString, toString, transformSelectString, useInputStreamToInsertBlob, useMaxForLimit |
MimerSQLDialect
public MimerSQLDialect()
- Even thoug Mimer SQL supports character and binary columns up to 15 000 in lenght,
this is also the maximum width of the table (exluding LOBs). To avoid breaking the limit all the
time we limit the length of the character columns to CHAR_MAX_LENTH, NATIONAL_CHAR_LENGTH for national
characters, and BINARY_MAX_LENGTH for binary types.
getAddColumnString
public String getAddColumnString()
- The syntax used to add a column to a table
- Overrides:
getAddColumnString in class Dialect
- Returns:
- The "add column" fragment.
dropConstraints
public boolean dropConstraints()
- We do not have to drop constraints before we drop the table
- Overrides:
dropConstraints in class Dialect
- Returns:
- True if constraints must be dropped prior to dropping
the table; false otherwise.
supportsIdentityColumns
public boolean supportsIdentityColumns()
- TODO: Check if Mimer SQL cannot handle the way DB2 does
- Overrides:
supportsIdentityColumns in class Dialect
- Returns:
- True if IDENTITY columns are supported; false otherwise.
supportsSequences
public boolean supportsSequences()
- Mimer SQL supports sequences
- Overrides:
supportsSequences in class Dialect
- Returns:
- boolean
getSequenceNextValString
public String getSequenceNextValString(String sequenceName)
- The syntax used to get the next value of a sequence in Mimer SQL
- Overrides:
getSequenceNextValString in class Dialect
- Parameters:
sequenceName - the name of the sequence
- Returns:
- String The "nextval" select string.
getCreateSequenceString
public String getCreateSequenceString(String sequenceName)
- The syntax used to create a sequence. Since we presume the sequences will be used as keys,
we make them unique.
- Overrides:
getCreateSequenceString in class Dialect
- Parameters:
sequenceName - The name of the sequence
- Returns:
- The sequence creation command
getDropSequenceString
public String getDropSequenceString(String sequenceName)
- The syntax used to drop sequences
- Overrides:
getDropSequenceString in class Dialect
- Parameters:
sequenceName - The name of the sequence
- Returns:
- The sequence drop commands
supportsLimit
public boolean supportsLimit()
- Mimer SQL does not support limit
- Overrides:
supportsLimit in class Dialect
- Returns:
- True if this dialect supports some form of LIMIT.
getCascadeConstraintsString
public String getCascadeConstraintsString()
- The syntax for using cascade on constraints
- Overrides:
getCascadeConstraintsString in class Dialect
- Returns:
- String
getQuerySequencesString
public String getQuerySequencesString()
- The syntax for fetching all sequnces avialable in the current schema.
- Overrides:
getQuerySequencesString in class Dialect
- Returns:
- The select command; or null if sequences are not supported.
- See Also:
SchemaUpdate
forUpdateOfColumns
public boolean forUpdateOfColumns()
- Does the FOR UPDATE OF syntax specify particular
columns?
- Overrides:
forUpdateOfColumns in class Dialect
- Returns:
- True if the database supports FOR UPDATE OF syntax;
false otherwise.
supportsForUpdate
public boolean supportsForUpdate()
- Support the FOR UPDATE syntax? For now, returns false since
the current version of the Mimer SQL JDBC Driver does not support
updatable resultsets. Otherwise, Mimer SQL actually supports the for update syntax.
- Returns:
- boolean
supportsOuterJoinForUpdate
public boolean supportsOuterJoinForUpdate()
- For now, simply return false since we don't updatable result sets.
- Overrides:
supportsOuterJoinForUpdate in class Dialect
- Returns:
- True if outer joined rows can be locked via FOR UPDATE.
