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HotRod is an ORM for Java, Spring and SpringBoot.
package org.hotrod.runtime.livesql.dialects;
import java.util.List;
import org.hotrod.runtime.livesql.exceptions.InvalidLiveSQLStatementException;
import org.hotrod.runtime.livesql.exceptions.UnsupportedLiveSQLFeatureException;
import org.hotrod.runtime.livesql.expressions.datetime.DateTimeExpression;
import org.hotrod.runtime.livesql.expressions.datetime.DateTimeFieldExpression;
import org.hotrod.runtime.livesql.expressions.numbers.NumberConstant;
import org.hotrod.runtime.livesql.expressions.numbers.NumberExpression;
import org.hotrod.runtime.livesql.expressions.strings.StringExpression;
import org.hotrod.runtime.livesql.ordering.OrderingTerm;
import org.hotrod.runtime.livesql.queries.select.CrossJoin;
import org.hotrod.runtime.livesql.queries.select.FullOuterJoin;
import org.hotrod.runtime.livesql.queries.select.InnerJoin;
import org.hotrod.runtime.livesql.queries.select.Join;
import org.hotrod.runtime.livesql.queries.select.LeftOuterJoin;
import org.hotrod.runtime.livesql.queries.select.NaturalFullOuterJoin;
import org.hotrod.runtime.livesql.queries.select.NaturalInnerJoin;
import org.hotrod.runtime.livesql.queries.select.NaturalLeftOuterJoin;
import org.hotrod.runtime.livesql.queries.select.NaturalRightOuterJoin;
import org.hotrod.runtime.livesql.queries.select.QueryWriter;
import org.hotrod.runtime.livesql.queries.select.RightOuterJoin;
import org.hotrod.runtime.livesql.queries.select.UnionJoin;
import org.hotrodorm.hotrod.utils.Separator;
public class SQLServerDialect extends SQLDialect {
public SQLServerDialect(final String productName, final String productVersion, final int majorVersion,
final int minorVersion) {
super(productName, productVersion, majorVersion, minorVersion);
}
// Identifier rendering
@Override
public IdentifierRenderer getIdentifierRenderer() {
// Identifier names are case insensitive in SQL Server
return new IdentifierRenderer("[a-zA-Z][a-zA-Z0-9_]*", "\"", "\"", false);
}
// Join rendering
@Override
public JoinRenderer getJoinRenderer() {
return new JoinRenderer() {
@Override
public String renderJoinKeywords(final Join join) throws UnsupportedLiveSQLFeatureException {
if (join instanceof InnerJoin) {
return "JOIN";
} else if (join instanceof LeftOuterJoin) {
return "LEFT OUTER JOIN";
} else if (join instanceof RightOuterJoin) {
return "RIGHT OUTER JOIN";
} else if (join instanceof FullOuterJoin) {
return "FULL OUTER JOIN";
} else if (join instanceof CrossJoin) {
return "CROSS JOIN";
} else if (join instanceof NaturalInnerJoin) {
return "NATURAL JOIN";
} else if (join instanceof NaturalLeftOuterJoin) {
return "NATURAL LEFT OUTER JOIN";
} else if (join instanceof NaturalRightOuterJoin) {
return "NATURAL RIGHT OUTER JOIN";
} else if (join instanceof NaturalFullOuterJoin) {
return "NATURAL FULL OUTER JOIN";
} else if (join instanceof UnionJoin) {
throw new UnsupportedLiveSQLFeatureException("Union joins are not supported in SQL Server database");
} else {
throw new UnsupportedLiveSQLFeatureException(
"Invalid join type (" + join.getClass().getSimpleName() + ") in SQL Server database");
}
}
};
}
// Pagination rendering
public PaginationRenderer getPaginationRenderer() {
return new PaginationRenderer() {
@Override
public PaginationType getPaginationType(final Integer offset, final Integer limit) {
if (offset != null) {
if (!versionIsAtLeast(11)) { // SQL Server 2012
throw new UnsupportedLiveSQLFeatureException(
"OFFSET not supported on this version of SQL Server. OFFSET is supported starting on SQL Server 2012 (internal version 11.0)");
}
}
return versionIsAtLeast(11) ? PaginationType.BOTTOM : PaginationType.TOP;
}
@Override
public void renderTopPagination(final Integer offset, final Integer limit, final QueryWriter w) {
if (offset == null && !versionIsAtLeast(11)) {
w.write(" top " + limit);
} else {
throw new UnsupportedLiveSQLFeatureException(
"In SQL Server before version 2012, LIMIT can only be used without OFFSET as the TOP clause");
}
}
@Override
public void renderBottomPagination(final Integer offset, final Integer limit, final QueryWriter w) {
if (offset != null) {
w.write("\nOFFSET " + offset + " ROWS");
} else if (limit != null) {
w.write("\nOFFSET 0 ROWS");
}
if (limit != null) {
w.write("FETCH NEXT " + limit + " ROWS ONLY");
}
}
@Override
public void renderBeginEnclosingPagination(final Integer offset, final Integer limit, final QueryWriter w) {
throw new UnsupportedLiveSQLFeatureException(
"Pagination cannot be rendered in enclosing fashion in SQL Server");
}
@Override
public void renderEndEnclosingPagination(final Integer offset, final Integer limit, final QueryWriter w) {
throw new UnsupportedLiveSQLFeatureException(
"Pagination cannot be rendered in enclosing fashion in SQL Server");
}
};
}
// Set operation rendering
@Override
public SetOperationRenderer getSetOperationRenderer() {
return new SetOperationRenderer() {
@Override
public void render(final SetOperation setOperation, final QueryWriter w) {
switch (setOperation) {
case UNION:
w.write("UNION");
break;
case UNION_ALL:
w.write("UNION ALL");
break;
case INTERSECT:
w.write("INTERSECT");
break;
case INTERSECT_ALL:
throw new UnsupportedLiveSQLFeatureException("SQL Server does not support the INTERSECT ALL set operation. "
+ "Nevertheless, it can be simulated using a semi join");
case EXCEPT:
w.write("EXCEPT");
break;
case EXCEPT_ALL:
throw new UnsupportedLiveSQLFeatureException("SQL Server does not support the EXCEPT ALL set operation. "
+ "Nevertheless, it can be simulated using an anti join");
default:
throw new InvalidLiveSQLStatementException("Invalid set operation '" + setOperation + "'.");
}
}
};
}
// Function rendering
@Override
public FunctionRenderer getFunctionRenderer() {
return new FunctionRenderer() {
// General purpose functions
// 8.0 for SQL Server 2000.
// 9.0 for SQL Server 2005.
// 10.0 for SQL Server 2008.
// 10.5 for SQL Server 2008 R2.
// 11.0 for SQL Server 2012.
// 12.0 for SQL Server 2014.
// 13.0 for SQL Server 2016.
// 14.0 for SQL Server 2017.
@Override
public void groupConcat(final QueryWriter w, final boolean distinct, final StringExpression value,
final List ordering, final StringExpression separator) {
if (versionIsAtLeast(14)) { // (SQL Server 2017)
throw new UnsupportedLiveSQLFeatureException("This SQL Server version (" + renderVersion()
+ ") does not support the GROUP_CONCAT() function (string_agg()). It's available since version 14.0 (SQL Server 2017)");
}
if (distinct) {
throw new UnsupportedLiveSQLFeatureException(
"SQL Server does not support DISTINCT on the GROUP_CONCAT() function (string_agg())");
}
if (separator == null) {
throw new UnsupportedLiveSQLFeatureException(
"SQL Server requires the separator to be specified on the GROUP_CONCAT() function (string_agg())");
}
w.write("string_agg(");
value.renderTo(w);
w.write(", ");
separator.renderTo(w);
w.write(")");
if (ordering != null && !ordering.isEmpty()) {
w.write(" within group (ORDER BY ");
Separator sep = new Separator();
for (OrderingTerm t : ordering) {
w.write(sep.render());
t.renderTo(w);
}
}
w.write(")");
}
// Arithmetic functions
@Override
public void logarithm(final QueryWriter w, final NumberExpression x, final NumberExpression base) {
if (base == null) {
this.write(w, "log", x);
} else {
this.write(w, "log", x, base);
}
}
@Override
public void round(final QueryWriter w, final NumberExpression x, final NumberExpression places) {
if (places == null) {
throw new UnsupportedLiveSQLFeatureException(
"SQL Server requires the number of decimal places to be specified on the ROUND() function");
}
this.write(w, "round", x, places);
}
@Override
public void trunc(final QueryWriter w, final NumberExpression x, final NumberExpression places) {
if (places == null) {
throw new UnsupportedLiveSQLFeatureException(
"SQL Server requires the number of decimal places to be specified on the TRUNC() function (round())");
}
this.write(w, "round", x, places, new NumberConstant(1));
}
// String functions
@Override
public void length(final QueryWriter w, final StringExpression string) {
this.write(w, "len", string);
}
@Override
public void locate(final QueryWriter w, final StringExpression substring, final StringExpression string,
final NumberExpression from) {
if (from == null) {
this.write(w, "charindex", substring, string);
} else {
this.write(w, "charindex", substring, string, from);
}
}
@Override
public void substr(final QueryWriter w, final StringExpression string, final NumberExpression from,
final NumberExpression length) {
if (length == null) {
throw new UnsupportedLiveSQLFeatureException(
"SQL Server requires the length parameter to be be specified on the SUBSTR() function");
}
this.write(w, "substring", string, from, length);
}
// Date/Time functions
@Override
public void currentDate(final QueryWriter w) {
w.write("getdate()");
}
@Override
public void currentTime(final QueryWriter w) {
w.write("convert(time, current_timestamp)");
}
@Override
public void currentDateTime(final QueryWriter w) {
w.write("current timestamp");
}
@Override
public void date(final QueryWriter w, final DateTimeExpression datetime) {
w.write("convert(date, ");
datetime.renderTo(w);
w.write(")");
}
@Override
public void time(final QueryWriter w, final DateTimeExpression datetime) {
w.write("convert(time, ");
datetime.renderTo(w);
w.write(")");
}
@Override
public void dateTime(final QueryWriter w, final DateTimeExpression date, final DateTimeExpression time) {
w.write("(");
date.renderTo(w);
w.write(" + ");
time.renderTo(w);
w.write(")");
}
@Override
public void extract(final QueryWriter w, final DateTimeExpression datetime, final DateTimeFieldExpression field) {
w.write("datepart(");
field.renderTo(w);
w.write(", ");
datetime.renderTo(w);
w.write(")");
}
};
}
}
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