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HHH-2655 ROW_NUMBER for Paging

This commit is contained in:
Strong Liu 2010-11-02 20:39:03 +08:00
parent 61060d13a9
commit 528b652d07
1 changed files with 17 additions and 18 deletions
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25
hibernate-core/src/main/java/org/hibernate/dialect/SQLServerDialect.java
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@ -37,7 +37,8 @@ import org.hibernate.type.StandardBasicTypes;
* @author Gavin King
*/
public class SQLServerDialect extends AbstractTransactSQLDialect {
private static final String SELECT = "select";
private static final String SELECT_DISTINCT = "select distinct";
public SQLServerDialect() {
registerColumnType( Types.VARBINARY, "image" );
registerColumnType( Types.VARBINARY, 8000, "varbinary($l)" );
@ -107,25 +108,23 @@ public class SQLServerDialect extends AbstractTransactSQLDialect {
}
// Find the end of the select statement
int selectIndex = querySqlLowered.trim().startsWith( "select distinct" ) ? 15 : 6;
int selectIndex = querySqlLowered.trim().indexOf(SELECT_DISTINCT);
if (selectIndex != -1) {
selectIndex += SELECT_DISTINCT.length();
} else {
selectIndex = querySqlLowered.trim().indexOf(SELECT);
if (selectIndex != -1) {
selectIndex += SELECT.length();
}
}
// Isert after the select statement the row_number() function:
sb.insert(selectIndex, " ROW_NUMBER() OVER (" + orderby + ") as __hibernate_row_nr__,");
//Wrap the query within a with statement:
sb.insert(0, "WITH query AS (").append(") SELECT * FROM query ");
sb.append( "WHERE __hibernate_row_nr__ " );
sb.append("WHERE __hibernate_row_nr__ BETWEEN ").append(offset + 1).append(" AND ").append(limit);
// The row_number() function is not zero based and so we must increment the offset and limit by one
if ( offset > 0 ) {
sb.append( "BETWEEN " ).append( offset + 1 ).append( " AND " ).append( limit + 1 );
}
else {
sb.append( " <= " ).append( limit );
}
// As mentioned before I don't think that we really need this last order by clause
// sb.append(" ORDER BY __hibernate_row_nr__");
return sb.toString();
}