无需关注字段类型，只要传入字段名与值的集合，自动生成Ms sql server SQL语句。
详见Test()方法
using System; namespace Fan.iData.SqlUtility
{ public class SqlBuilder
{
private System.Data.DataView ct;
private string _tableName;
private string _ConnName; public SqlBuilder(string tableName)
{
_tableName = tableName;
_ConnName = ""; ct = GetColumnsType(); if (ct == null || ct.Table.Rows.Count == 0)
throw new Exception("要操作的表不存在！");
}
public SqlBuilder(string tableName,string connname)
{
//
_tableName=tableName;
if (connname==null)
_ConnName="";
else
_ConnName = connname; ct=GetColumnsType(); if (ct==null || ct.Table.Rows.Count==0)
throw new Exception("要操作的表不存在！");
} /// <summary>
/// 生成Insert语句
/// </summary>
/// <param name="tn"></param>
/// <param name="v"></param>
/// <param name="type">0=空值以null替代;1=空值转换(字符型为'',数值型为0,日期型为null);2=空值跳过(这时值取决于数据库的默认值设置)</param>
/// <returns></returns>
public string BuildInsertSql(System.Collections.Specialized.NameValueCollection v,int type)
{ if (ct==null || ct.Table.Rows.Count==0)
{
throw new Exception("要操作的表或字段不存在！");
}
//将V name全部改成小写
System.Collections.Specialized.NameValueCollection lowerv=new System.Collections.Specialized.NameValueCollection();
for ( int x=0;x<v.Count;x++)
{
string vn=v.GetKey(x).ToLower();
string vv="";
if (v[x] !=null)
vv=v[x].ToString();
lowerv.Add(vn,vv);
}
v=lowerv; int colcount=0; string columns="",values=""; string vKeys=Key2String(v).ToLower(); for (int i=0;i<ct.Table.Rows.Count;i++)
{
string coln=ct.Table.Rows[i]["name"].ToString(); if (v!=null && vKeys.IndexOf(","+coln.ToLower()+",")!=-1)
{
colcount++; string colv=v[coln.ToLower()].ToString();
int collen=int.Parse(ct.Table.Rows[i]["length"].ToString())
,coltype=int.Parse(ct.Table.Rows[i]["xtype"].ToString()); //coltype
//0=数据
//1=字符型
//2=日期型
//-1=不支持的类型 if (coltype==-1)
throw new Exception("出现不支持的数据类型！"); if (colv==null || colv=="")
{
#region 空值
if (type==0)
{
columns+=(columns.Equals(string.Empty))?" ["+ coln +"] ":", ["+ coln +"] ";
values+=(values.Equals(string.Empty))?" null ":", null ";
}
else if (type==1)
{
columns+=(columns.Equals(string.Empty))?" ["+ coln +"] ":", ["+ coln +"] "; if (coltype==0)
values+=(values.Equals(string.Empty))?" 0 ":", 0 ";
else if (coltype==1)
values+=(values.Equals(string.Empty))?" '' ":", '' ";
else if (coltype==2)
values += (values.Equals(string.Empty)) ? " N'' " : ", N'' ";
else
values+=(values.Equals(string.Empty))?" null ":", null ";
}
else
{
continue;
}
#endregion }
else
{
#region 代入字段值 //简单判断字符型的长度，可以自己加其它的判断
// if (coltype==1 && colv.Length>collen)
// {
// throw new Exception("要插入的字符串长度超过数据库设置！");
// } //0=数值型;1=字符型;2=Unicode字符型;3=日期型;4=二进制数据
if (coltype==0 || coltype==4)
{
columns+=(columns.Equals(string.Empty))?" ["+ coln +"] ":", ["+ coln +"] ";
values+=(values.Equals(string.Empty))?" "+ colv +" ":", "+ colv +" ";
}
else if (coltype==1 || coltype==3)
{
colv=colv.Replace("'","''");
columns+=(columns.Equals(string.Empty))?" ["+ coln +"] ":", ["+ coln +"] ";
values+=(values.Equals(string.Empty))?" '"+ colv +"' ":", '"+ colv +"' ";
}
else if (coltype == 2)
{
colv = colv.Replace("'", "''");
columns += (columns.Equals(string.Empty)) ? " [" + coln + "] " : ", [" + coln + "] ";
values += (values.Equals(string.Empty)) ? " N'" + colv + "' " : ", N'" + colv + "' ";
}
else
{
continue;
} #endregion
}
}
} if (v!=null && colcount!=v.Count)
throw new Exception("指定的字段列表中某些字段不存在！"); if (!columns.Equals(string.Empty) && !values.Equals(string.Empty))
{
string sql = "Insert into {0} ({1}) values ({2})";
return string.Format(sql,_tableName,columns,values);
}
else
return string.Empty; }
public string BuildInsertSql(System.Collections.Specialized.NameValueCollection v)
{
return BuildInsertSql(v,0);
}
接下来还有段
/// <summary>
/// 生成update语句
/// </summary>
/// <param name="tn"></param>
/// <param name="v"></param>
/// <param name="type">0=空值以null替代;1=空值转换(字符型为'',数值型为0,日期型为null);2=空值跳过</param>
/// <returns></returns>
public string BuildUpdateSql(System.Collections.Specialized.NameValueCollection v
,System.Collections.Specialized.NameValueCollection identity,int type)
{
if (ct==null || ct.Table.Rows.Count==)
{
throw new Exception("要操作的表或字段不存在！");
} //将V name全部改成小写
System.Collections.Specialized.NameValueCollection lowerv=new System.Collections.Specialized.NameValueCollection();
for ( int x=;x<v.Count;x++)
{
string vn=v.GetKey(x).ToLower();
string vv="";
if (v[x] !=null)
vv=v[x].ToString();
lowerv.Add(vn,vv);
}
v=lowerv; //将V name全部改成小写
System.Collections.Specialized.NameValueCollection lowerid=new System.Collections.Specialized.NameValueCollection();
for ( int x=;x<identity.Count;x++)
{
string vn=identity.GetKey(x).ToLower();
string vv="";
if (identity[x] !=null)
vv=identity[x].ToString();
lowerid.Add(vn,vv);
}
identity=lowerid; string setvalues="",identitycolumns="";
int idcount=
,colcount=; string vKeys=Key2String(v).ToLower()
,idKeys=Key2String(identity).ToLower(); #region 生成Set串
for (int i=;i<ct.Table.Rows.Count;i++)
{
string coln=ct.Table.Rows[i]["name"].ToString(); if (identity!=null && idKeys.IndexOf(","+coln.ToLower()+",")!=-)
{
idcount++; string colv=identity[coln.ToLower()].ToString();
int coltype=int.Parse(ct.Table.Rows[i]["xtype"].ToString()); if (colv==null)
throw new Exception("指定的条件没有给出匹配值！"); //0=数值型;1=字符型;2=Unicode字符型;3=日期型;4=二进制数据
if (coltype== || coltype==)
{
identitycolumns+=(identitycolumns.Equals(string.Empty))?" ["+ coln +"]="+ colv +" ":"and ["+ coln +"]="+ colv +" ";
}
else if (coltype== || coltype==)
{
colv=colv.Replace("'","''");
identitycolumns+=(identitycolumns.Equals(string.Empty))?" ["+ coln +"]='"+ colv +"' ":"and ["+ coln +"]='"+ colv +"' ";
}
else if (coltype == )
{
colv = colv.Replace("'", "''");
identitycolumns += (identitycolumns.Equals(string.Empty)) ? " [" + coln + "]=N'" + colv + "' " : "and [" + coln + "]=N'" + colv + "' ";
} //这里存在一个小缺陷，多个条件间只能是与操作 } if (v!=null && vKeys.IndexOf(","+coln.ToLower()+",")!=-)
{
colcount++;
string colv=v[coln.ToLower()].ToString();
int collen=int.Parse(ct.Table.Rows[i]["length"].ToString())
,coltype=int.Parse(ct.Table.Rows[i]["xtype"].ToString()); //coltype
//0=数据
//1=字符型
//2=日期型
//-1=不支持的类型 if (coltype==-)
throw new Exception("出现不支持的数据类型！"); if (colv==null || colv=="")
{
#region 空值
//0=数值型;1=字符型;2=Unicode字符型;3=日期型;4=二进制数据
if (type==)
{
setvalues+=(setvalues.Equals(string.Empty))?" ["+ coln +"]=null ":", ["+ coln +"]=null ";
}
else if (type==)
{
if (coltype==)
setvalues+=(setvalues.Equals(string.Empty))?" ["+ coln +"]=0 ":", ["+ coln +"]=0 ";
else if (coltype==)
setvalues+=(setvalues.Equals(string.Empty))?" ["+ coln +"]='' ":", ["+ coln +"]='' ";
else if (coltype==)
setvalues += (setvalues.Equals(string.Empty)) ? " [" + coln + "]=N'' " : ", [" + coln + "]=N'' ";
else
setvalues+=(setvalues.Equals(string.Empty))?" ["+ coln +"]=null ":", ["+ coln +"]=null ";
} #endregion }
else
{
#region 代入字段值 //简单判断字符型的长度，可以加其它的判断
// if (coltype==1 && colv.Length>collen)
// {
// throw new Exception("要插入的字符串长度超过数据库设置！");
// } //0=数值型;1=字符型;2=Unicode字符型;3=日期型;4=二进制数据
if (coltype== || coltype==)
{
setvalues+=(setvalues.Equals(string.Empty))?" ["+ coln +"]="+ colv +" ":", ["+ coln +"]="+ colv +" ";
}
else if (coltype== || coltype==)
{
colv=colv.Replace("'","''");
setvalues+=(setvalues.Equals(string.Empty))?" ["+ coln +"]='"+ colv +"' ":", ["+ coln +"]='"+ colv +"' ";
}
else if (coltype == )
{
colv = colv.Replace("'", "''");
setvalues += (setvalues.Equals(string.Empty)) ? " [" + coln + "]=N'" + colv + "' " : ", [" + coln + "]=N'" + colv + "' ";
} #endregion
}
}
}
#endregion if (identity!=null && idcount!=identity.Count)
throw new Exception("指定的更新条件中某些字段不存在！"); if (v!=null && colcount!=v.Count)
throw new Exception("指定的字段列表中某些字段不存在！"); if (!setvalues.Equals(string.Empty))
{
string sql="";
if (identity!=null && identity.Count>)
{
sql="update {0} set {1} where {2}";
sql=string.Format(sql,_tableName,setvalues,identitycolumns);
}
else
{
sql = "update {0} set {1}";
sql=string.Format(sql,_tableName,setvalues);
}
return sql;
}
else
return string.Empty;
}
public string BuildUpdateSql(System.Collections.Specialized.NameValueCollection v,System.Collections.Specialized.NameValueCollection identity)
{
return BuildUpdateSql(v,identity,);
}
public string BuildUpdateSql(System.Collections.Specialized.NameValueCollection v,string idcolumn,string idvalue,int type)
{
System.Collections.Specialized.NameValueCollection identity=new System.Collections.Specialized.NameValueCollection();
identity.Add(idcolumn,idvalue);
return BuildUpdateSql(v,identity,type);
}
public string BuildUpdateSql(System.Collections.Specialized.NameValueCollection v,string idcolumn,string idvalue)
{
return BuildUpdateSql(v,idcolumn,idvalue,);
} /// <summary>
/// 生成没有Where条件的Update语句
/// </summary>
/// <param name="v"></param>
/// <param name="type"></param>
/// <returns></returns>
public string BuildUpdateSql(System.Collections.Specialized.NameValueCollection v,int type)
{
return BuildUpdateSql(v,null,type);
} /// <summary>
/// 生成没有Where条件的Update语句
/// </summary>
/// <param name="v"></param>
/// <returns></returns>
public string BuildUpdateSql(System.Collections.Specialized.NameValueCollection v)
{
return BuildUpdateSql(v,null,);
} /// <summary>
///
/// </summary>
/// <returns></returns>
private System.Data.DataView GetColumnsType()
{ Fan.iData.DB idb; //数据库连接类，改成自己的数据库连接
if (_ConnName == "")
idb = new Fan.iData.DB();
else
idb = new Fan.iData.DB(_ConnName); string sql = @"
select a.[name],a.[length]
,case
when a.xusertype in (127,104,106,62,56,60,108,59,52,122,48) then 0
when a.xusertype in (175,35,167) then 1
when a.xusertype in (239,99,231) then 2
when a.xusertype in (61,58) then 3
when a.xusertype in (165,173,36) then 4
when a.xusertype in (34,98,241,189,256) then -1 else -1 end [xtype]
from syscolumns a
where object_id('" + _tableName + @"')=a.[id] order by a.colid
";
return idb.GetDataView(sql); #region
//0=数值型;1=字符型;2=Unicode字符型;3=日期型;4=二进制数据;-1=不支持的类型
//name xtype
//bigint 127
//binary 173
//bit 104
//char 175
//datetime 61
//decimal 106
//float 62
//image 34
//int 56
//money 60
//nchar 239
//ntext 99
//numeric 108
//nvarchar 231
//real 59
//smalldatetime 58
//smallint 52
//smallmoney 122
//sql_variant 98
//sysname 231
//text 35
//timestamp 189
//tinyint 48
//uniqueidentifier 36
//varbinary 165
//varchar 167
//xml 241
#endregion } private string Key2String(System.Collections.Specialized.NameValueCollection k)
{
string keystring=",";
for (int i=;k!=null && i<k.Count;i++)
{
keystring+=k.GetKey(i)+',';
}
return keystring;
} private void Test()
{
System.Collections.Specialized.NameValueCollection nvc = new System.Collections.Specialized.NameValueCollection();
nvc.Add("col1", "value1");
nvc.Add("col2", "value2");
SqlBuilder isql = new SqlBuilder("testTable"); string InsertSql=isql.BuildInsertSql(nvc);
string UpdateSql = isql.BuildUpdateSql(nvc, "idCol", "value"); }
}
}
两段连起来就行了。
,下面代码中数据库连接部分需要修改成你自己的数据连接代码。