摘要：
PrivatevoiddoQuery（）｛BoolhasWhere=false；StringBuildersql=newStringBuilder（“SELECT*FROMT_Emplee”）；if（选中标记号复选框）｛hasWhere=appendWhereIfNeed（sql，hasWhere）；sql.appendLine（“FNumberBETWEEN”+标记号文本框1 content+“AND”
private void doQuery()
{
Bool hasWhere = false;
StringBuilder sql = new StringBuilder(" SELECT * FROM T_Employee");
if(工号复选框选中)
{
hasWhere = appendWhereIfNeed(sql, hasWhere);
sql.appendLine("FNumber BETWEEN '"+工号文本框1内容+"' AND '"+工号文本框2内容+"'");
}
if(姓名复选框选中)
{
hasWhere = appendWhereIfNeed(sql, hasWhere);
sql.appendLine("FName LIKE '%"+姓名文本框内容+"%'");
}
if(年龄复选框选中)
{
hasWhere = appendWhereIfNeed(sql, hasWhere);
sql.appendLine("FAge BETWEEN "+年龄文本框1内容+" AND "+年龄文本框2内容);
}
executeSQL(sql);
}
private Bool appendWhereIfNeed(StringBuilder sql,Bool hasWhere)
{
if(hasWhere==false)
{
sql. appendLine("WHERE");
}
else
{
sql. appendLine("AND");
}
}
摘自《程序员的SQL金典》。