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[#2729] Emulate IS DISTINCT FROM through IS / IS NOT in SQLite

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This commit is contained in:
lukaseder 2013-09-08 11:29:49 +02:00
parent 4c5777e79f
commit d1c0d45f66
2 changed files with 43 additions and 4 deletions
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24
jOOQ/src/main/java/org/jooq/Field.java
View File

@ -864,6 +864,12 @@ public interface Field<T> extends GroupField {
* Create a condition to check if this field is <code>DISTINCT</code> from
* another value.
* <p>
* In {@link SQLDialect#MYSQL} and {@link SQLDialect#MARIADB}, this can be
* emulated through <code><pre>not([this] &lt;=> [value])</pre></code>
* <p>
* In {@link SQLDialect#SQLITE}, this can be emulated through
* <code><pre>[this] IS NOT [value]</pre></code>
* <p>
* If this is not supported by the underlying database, jOOQ will render
* this instead: <code><pre>
* CASE WHEN [this] IS NULL AND [value] IS NULL THEN FALSE
@ -886,6 +892,12 @@ public interface Field<T> extends GroupField {
* Create a condition to check if this field is <code>DISTINCT</code> from
* another field.
* <p>
* In {@link SQLDialect#MYSQL} and {@link SQLDialect#MARIADB}, this can be
* emulated through <code><pre>not([this] &lt;=> [value])</pre></code>
* <p>
* In {@link SQLDialect#SQLITE}, this can be emulated through
* <code><pre>[this] IS NOT [value]</pre></code>
* <p>
* If this is not supported by the underlying database, jOOQ will render
* this instead: <code><pre>
* CASE WHEN [this] IS NULL AND [field] IS NULL THEN FALSE
@ -908,6 +920,12 @@ public interface Field<T> extends GroupField {
* Create a condition to check if this field is <code>NOT DISTINCT</code>
* from another value.
* <p>
* In {@link SQLDialect#MYSQL} and {@link SQLDialect#MARIADB}, this can be
* emulated through <code><pre>[this] &lt;=> [value]</pre></code>
* <p>
* In {@link SQLDialect#SQLITE}, this can be emulated through
* <code><pre>[this] IS [value]</pre></code>
* <p>
* If this is not supported by the underlying database, jOOQ will render
* this instead: <code><pre>
* CASE WHEN [this] IS NULL AND [value] IS NULL THEN TRUE
@ -930,6 +948,12 @@ public interface Field<T> extends GroupField {
* Create a condition to check if this field is <code>NOT DISTINCT</code>
* from another field.
* <p>
* In {@link SQLDialect#MYSQL} and {@link SQLDialect#MARIADB}, this can be
* emulated through <code><pre>[this] &lt;=> [value]</pre></code>
* <p>
* In {@link SQLDialect#SQLITE}, this can be emulated through
* <code><pre>[this] IS [value]</pre></code>
* <p>
* If this is not supported by the underlying database, jOOQ will render
* this instead: <code><pre>
* CASE WHEN [this] IS NULL AND [field] IS NULL THEN TRUE

23
jOOQ/src/main/java/org/jooq/impl/IsDistinctFrom.java
View File

@ -77,6 +77,7 @@ class IsDistinctFrom<T> extends AbstractCondition {
private final Comparator comparator;
private transient QueryPartInternal mySQLCondition;
private transient QueryPartInternal sqliteCondition;
private transient QueryPartInternal compareCondition;
private transient QueryPartInternal caseExpression;
@ -108,8 +109,8 @@ class IsDistinctFrom<T> extends AbstractCondition {
*/
private final QueryPartInternal delegate(Configuration configuration) {
// These dialects need to simulate the IS DISTINCT FROM operator
if (asList(ASE, CUBRID, DB2, DERBY, INGRES, ORACLE, SQLSERVER, SQLITE, SYBASE).contains(configuration.dialect().family())) {
// These dialects need to simulate the IS DISTINCT FROM predicate
if (asList(ASE, CUBRID, DB2, DERBY, INGRES, ORACLE, SQLSERVER, SYBASE).contains(configuration.dialect().family())) {
if (caseExpression == null) {
if (comparator == Comparator.IS_DISTINCT_FROM) {
caseExpression = (QueryPartInternal) decode()
@ -138,7 +139,7 @@ class IsDistinctFrom<T> extends AbstractCondition {
else if (asList(MARIADB, MYSQL).contains(configuration.dialect())) {
if (mySQLCondition == null) {
if (comparator == Comparator.IS_DISTINCT_FROM) {
mySQLCondition = (QueryPartInternal) condition("not({0} <=> {1})", lhs, rhs);
mySQLCondition = (QueryPartInternal) condition("{not}({0} <=> {1})", lhs, rhs);
}
else {
mySQLCondition = (QueryPartInternal) condition("{0} <=> {1}", lhs, rhs);
@ -148,7 +149,21 @@ class IsDistinctFrom<T> extends AbstractCondition {
return mySQLCondition;
}
// These dialects natively support the IS DISTINCT FROM operator:
// SQLite knows the IS / IS NOT predicate
else if (SQLITE == configuration.dialect()) {
if (sqliteCondition == null) {
if (comparator == Comparator.IS_DISTINCT_FROM) {
sqliteCondition = (QueryPartInternal) condition("{0} {is not} {1}", lhs, rhs);
}
else {
sqliteCondition = (QueryPartInternal) condition("{0} {is} {1}", lhs, rhs);
}
}
return sqliteCondition;
}
// These dialects natively support the IS DISTINCT FROM predicate:
// H2, Postgres
else {
if (compareCondition == null) {