Package org.h2.expression.condition
Class CompareLike
java.lang.Object
org.h2.expression.Expression
org.h2.expression.condition.Condition
org.h2.expression.condition.CompareLike
Pattern matching comparison expression: WHERE NAME LIKE ?
-
Nested Class Summary
Nested Classes -
Field Summary
FieldsModifier and TypeFieldDescriptionprivate static final int
private final CompareMode
private final String
private Expression
private boolean
private boolean
private boolean
private boolean
private Expression
private final CompareLike.LikeType
private static final int
private final boolean
private static final int
private char[]
private int
private Pattern
private String
private int[]
one of MATCH / ONE / ANYprivate Expression
private boolean
indicates that we can shortcut the comparison and use containsprivate boolean
indicates that we can shortcut the comparison and use endsWithprivate boolean
indicates that we can shortcut the comparison and use startsWithprivate final boolean
Fields inherited from class org.h2.expression.Expression
AUTO_PARENTHESES, MAP_IN_AGGREGATE, MAP_IN_WINDOW, MAP_INITIAL, WITH_PARENTHESES, WITHOUT_PARENTHESES
Fields inherited from interface org.h2.util.HasSQL
ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS
-
Constructor Summary
ConstructorsConstructorDescriptionCompareLike
(Database db, Expression left, boolean not, boolean whenOperand, Expression right, Expression escape, CompareLike.LikeType likeType) CompareLike
(CompareMode compareMode, String defaultEscape, Expression left, boolean not, boolean whenOperand, Expression right, Expression escape, CompareLike.LikeType likeType) -
Method Summary
Modifier and TypeMethodDescriptionprivate boolean
private boolean
private static boolean
containsIgnoreCase
(String src, String what) void
createIndexConditions
(SessionLocal session, TableFilter filter) Create index conditions if possible and attach them to the table filter.int
getCost()
Estimate the cost to process the expression.private static Character
private Character
getNotIfPossible
(SessionLocal session) If it is possible, return the negated expression.getSubexpression
(int index) Returns subexpression with specified index.int
Returns count of subexpressions.getUnenclosedSQL
(StringBuilder builder, int sqlFlags) Get the SQL statement of this expression.getValue
(SessionLocal session) Return the resulting value for the current row.private Value
getValue
(SessionLocal session, Value left) getWhenSQL
(StringBuilder builder, int sqlFlags) Appends the SQL statement of this when operand to the specified builder.boolean
getWhenValue
(SessionLocal session, Value left) Return the resulting value of when operand for the current row.void
initPattern
(String p, Character escapeChar) Initializes the pattern.boolean
isEverything
(ExpressionVisitor visitor) Check if this expression and all sub-expressions can fulfill a criteria.private boolean
boolean
Returns whether this expression is a right side of condition in a when operand.void
mapColumns
(ColumnResolver resolver, int level, int state) Map the columns of the resolver to expression columns.boolean
Returns whether this expressions needs to be wrapped in parentheses when it is used as an argument of other expressions.optimize
(SessionLocal session) Try to optimize the expression.void
setEvaluatable
(TableFilter tableFilter, boolean b) Tell the expression columns whether the table filter can return values now.boolean
Test if the value matches the initialized pattern.boolean
Test if the value matches the pattern.void
updateAggregate
(SessionLocal session, int stage) Update an aggregate value.Methods inherited from class org.h2.expression.condition.Condition
castToBoolean, getType
Methods inherited from class org.h2.expression.Expression
addFilterConditions, getAlias, getBooleanValue, getColumnName, getColumnNameForView, getEnclosedSQL, getNonAliasExpression, getNullable, getSchemaName, getSQL, getSQL, getSQL, getSQL, getTableAlias, getTableName, isConstant, isIdentity, isNullConstant, isValueSet, optimizeCondition, toString, writeExpressions, writeExpressions
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
Methods inherited from interface org.h2.util.HasSQL
getTraceSQL
-
Field Details
-
MATCH
private static final int MATCH- See Also:
-
ONE
private static final int ONE- See Also:
-
ANY
private static final int ANY- See Also:
-
compareMode
-
defaultEscape
-
likeType
-
left
-
not
private final boolean not -
whenOperand
private final boolean whenOperand -
right
-
escape
-
isInit
private boolean isInit -
patternChars
private char[] patternChars -
patternString
-
patternTypes
private int[] patternTypesone of MATCH / ONE / ANY -
patternLength
private int patternLength -
patternRegexp
-
ignoreCase
private boolean ignoreCase -
fastCompare
private boolean fastCompare -
invalidPattern
private boolean invalidPattern -
shortcutToStartsWith
private boolean shortcutToStartsWithindicates that we can shortcut the comparison and use startsWith -
shortcutToEndsWith
private boolean shortcutToEndsWithindicates that we can shortcut the comparison and use endsWith -
shortcutToContains
private boolean shortcutToContainsindicates that we can shortcut the comparison and use contains
-
-
Constructor Details
-
CompareLike
public CompareLike(Database db, Expression left, boolean not, boolean whenOperand, Expression right, Expression escape, CompareLike.LikeType likeType) -
CompareLike
public CompareLike(CompareMode compareMode, String defaultEscape, Expression left, boolean not, boolean whenOperand, Expression right, Expression escape, CompareLike.LikeType likeType)
-
-
Method Details
-
getEscapeChar
-
needParentheses
public boolean needParentheses()Description copied from class:Expression
Returns whether this expressions needs to be wrapped in parentheses when it is used as an argument of other expressions.- Overrides:
needParentheses
in classExpression
- Returns:
true
if it is
-
getUnenclosedSQL
Description copied from class:Expression
Get the SQL statement of this expression. This may not always be the original SQL statement, especially after optimization. Enclosing '(' and ')' are never appended.- Specified by:
getUnenclosedSQL
in classExpression
- Parameters:
builder
- string buildersqlFlags
- formatting flags- Returns:
- the specified string builder
-
getWhenSQL
Description copied from class:Expression
Appends the SQL statement of this when operand to the specified builder.- Overrides:
getWhenSQL
in classExpression
- Parameters:
builder
- string buildersqlFlags
- formatting flags- Returns:
- the specified string builder
-
optimize
Description copied from class:Expression
Try to optimize the expression.- Specified by:
optimize
in classExpression
- Parameters:
session
- the session- Returns:
- the optimized expression
-
getEscapeChar
-
createIndexConditions
Description copied from class:Expression
Create index conditions if possible and attach them to the table filter.- Overrides:
createIndexConditions
in classExpression
- Parameters:
session
- the sessionfilter
- the table filter
-
getValue
Description copied from class:Expression
Return the resulting value for the current row.- Specified by:
getValue
in classExpression
- Parameters:
session
- the session- Returns:
- the result
-
getWhenValue
Description copied from class:Expression
Return the resulting value of when operand for the current row.- Overrides:
getWhenValue
in classExpression
- Parameters:
session
- the sessionleft
- value on the left side- Returns:
- the result
-
getValue
-
containsIgnoreCase
-
compareAt
-
compare
-
isWhenConditionOperand
public boolean isWhenConditionOperand()Description copied from class:Expression
Returns whether this expression is a right side of condition in a when operand.- Overrides:
isWhenConditionOperand
in classExpression
- Returns:
true
if it is,false
otherwise
-
test
Test if the value matches the pattern.- Parameters:
testPattern
- the patternvalue
- the valueescapeChar
- the escape character- Returns:
- true if the value matches
-
test
Test if the value matches the initialized pattern.- Parameters:
value
- the value- Returns:
- true if the value matches
-
initPattern
Initializes the pattern.- Parameters:
p
- the patternescapeChar
- the escape character
-
isFullMatch
private boolean isFullMatch() -
getNotIfPossible
Description copied from class:Expression
If it is possible, return the negated expression. This is used to optimize NOT expressions: NOT ID>10 can be converted to ID<=10. Returns null if negating is not possible.- Overrides:
getNotIfPossible
in classExpression
- Parameters:
session
- the session- Returns:
- the negated expression, or null
-
mapColumns
Description copied from class:Expression
Map the columns of the resolver to expression columns.- Specified by:
mapColumns
in classExpression
- Parameters:
resolver
- the column resolverlevel
- the subquery nesting levelstate
- current state for nesting checks, initial value isExpression.MAP_INITIAL
-
setEvaluatable
Description copied from class:Expression
Tell the expression columns whether the table filter can return values now. This is used when optimizing the query.- Specified by:
setEvaluatable
in classExpression
- Parameters:
tableFilter
- the table filterb
- true if the table filter can return value
-
updateAggregate
Description copied from class:Expression
Update an aggregate value. This method is called at statement execution time. It is usually called once for each row, but if the expression is used multiple times (for example in the column list, and as part of the HAVING expression) it is called multiple times - the row counter needs to be used to make sure the internal state is only updated once.- Specified by:
updateAggregate
in classExpression
- Parameters:
session
- the sessionstage
- select stage
-
isEverything
Description copied from class:Expression
Check if this expression and all sub-expressions can fulfill a criteria. If any part returns false, the result is false.- Specified by:
isEverything
in classExpression
- Parameters:
visitor
- the visitor- Returns:
- if the criteria can be fulfilled
-
getCost
public int getCost()Description copied from class:Expression
Estimate the cost to process the expression. Used when optimizing the query, to calculate the query plan with the lowest estimated cost.- Specified by:
getCost
in classExpression
- Returns:
- the estimated cost
-
getSubexpressionCount
public int getSubexpressionCount()Description copied from class:Expression
Returns count of subexpressions.- Overrides:
getSubexpressionCount
in classExpression
- Returns:
- count of subexpressions
-
getSubexpression
Description copied from class:Expression
Returns subexpression with specified index.- Overrides:
getSubexpression
in classExpression
- Parameters:
index
- 0-based index- Returns:
- subexpression with specified index, may be null
-