com.jn.sqlhelper.dialect.internal.FirebirdDialect Maven / Gradle / Ivy
package com.jn.sqlhelper.dialect.internal;
import com.jn.sqlhelper.dialect.pagination.RowSelection;
import com.jn.sqlhelper.dialect.internal.limit.AbstractLimitHandler;
import com.jn.sqlhelper.dialect.internal.limit.LimitHelper;
/**
* http://www.firebirdsql.org/file/documentation/reference_manuals/fblangref25-en/html/fblangref25-dml-select.html#fblangref25-dml-select-first-skip
* http://www.firebirdsql.org/file/documentation/reference_manuals/fblangref25-en/html/fblangref25-commons-predicates.html
*/
public class FirebirdDialect extends InterbaseDialect {
public FirebirdDialect() {
super();
setLimitHandler(new AbstractLimitHandler() {
@Override
public String processSql(String sql, boolean isSubQuery, boolean useLimitVariable, RowSelection selection) {
boolean hasOffset = LimitHelper.hasFirstRow(selection);
sql = sql.trim();
StringBuilder sqlbuiler = new StringBuilder(sql.length() + 20).append(sql);
String substring = "";
if(useLimitVariable && isUseLimitInVariableMode(isSubQuery)){
substring = hasOffset ? " first ? skip ?" : " first ?";
}else{
int firstRow = (int)convertToFirstRowValue(LimitHelper.getFirstRow(selection));
int lastRow = getMaxOrLimit(selection);
substring = " first "+lastRow ;
if(hasOffset){
substring = " skip "+ firstRow +" ";
}
}
return sqlbuiler.insert(6, substring).toString();
}
});
}
@Override
public boolean isSupportsLimit() {
return true;
}
@Override
public boolean isBindLimitParametersFirst() {
return true;
}
@Override
public boolean isBindLimitParametersInReverseOrder() {
return true;
}
}