sqlserverdialect.java

来自「用Java实现的23个常用设计模式源代码」· Java 代码 · 共 43 行

//$Id: SQLServerDialect.java,v 1.1.2.2 2003/11/14 03:37:40 oneovthafew Exp $
package net.sf.hibernate.dialect;

/**
 * A dialect for Microsoft SQL Server 2000
 * @author Gavin King
 */
public class SQLServerDialect extends SybaseDialect {
	
	public boolean bindLimitParametersFirst() {
		return super.bindLimitParametersFirst();
	}

	public String getLimitString(String querySelect, boolean hasOffset, int limit) {
		if (hasOffset) throw new UnsupportedOperationException("sql server has no offset");
		return new StringBuffer( querySelect.length()+6 )
			.append(querySelect)
			.insert( getAfterSelectInsertPoint(querySelect), " top " + limit )
			.toString();
	}

	public boolean supportsLimit() {
		return true;
	}

	public boolean useMaxForLimit() {
		return true;
	}

	public boolean supportsLimitOffset() {
		return false;
	}

	public boolean supportsVariableLimit() {
		return false;
	}

	private static int getAfterSelectInsertPoint(String sql) {
		return sql.startsWith("select distinct") ? 15 : 6;
	}

}