public static DataObjectInfo GetDataObjectInfo(string TableName, OleExec DB, DB_TYPE_ENUM DBType)
{
//先從靜態緩存中檢索,命中則返回,否則加載新的
string strTableName = TableName.ToUpper();
string strSql = "";
DataObjectInfo info = null;
if (TableConfigs.ContainsKey(strTableName))
{
info = (DataObjectInfo)TableConfigs[strTableName].Data;
return(info);
}
info = new DataObjectInfo();
if (DBType == DB_TYPE_ENUM.Oracle)
{
//查詢Table元數據
strSql =
$@"SELECT
T1.OWNER,
T1.TABLE_NAME,
T1.COLUMN_NAME,
T1.NULLABLE,
T1.DATA_TYPE ,
T1.DATA_LENGTH ,
T2.COMMENTS
FROM all_tab_cols T1, all_col_comments T2
WHERE T1.TABLE_NAME = T2.TABLE_NAME
AND T1.COLUMN_NAME = T2.COLUMN_NAME
AND T1.TABLE_NAME = '{strTableName}'";
DataSet res = DB.ExecSelect(strSql);
for (int i = 0; i < res.Tables[0].Rows.Count; i++)
{
DataObjectColInfo CI = new DataObjectColInfo();
CI.name = res.Tables[0].Rows[i]["COLUMN_NAME"].ToString();
switch (res.Tables[0].Rows[i]["DATA_TYPE"].ToString())
{
case "VARCHAR2":
case "NVARCHAR2":
case "CHAR":
case "CLOB":
CI.DataType = typeof(string);
break;
case "DATE":
CI.DataType = typeof(DateTime);
break;
case "NUMBER":
case "FLOAT":
CI.DataType = typeof(double);
break;
case "LONG":
CI.DataType = typeof(long);
break;
case "BLOB":
CI.DataType = typeof(object);
break;
default:
throw new Exception($@"Table:{strTableName} Col: {CI.name} dataType:{res.Tables[0].Rows[i]["DATA_TYPE"].ToString()} 不受支持");
}
CI.length = double.Parse(res.Tables[0].Rows[i]["DATA_LENGTH"].ToString());
CI.nullable = res.Tables[0].Rows[i]["NULLABLE"].ToString() == "Y" ? true : false;
info.BaseColsInfo.Add(CI);
}
DictionaryItem item = new DictionaryItem();
info.TableName = TableName;
item.Data = info;
TableConfigs.Add(TableName, item);
return(info);
}
else
{
throw new Exception("數據庫類型:" + DBType.ToString() + "不受支持");
}
}
//public
public DataObjectTable(string _TableName, OleExec DB, DB_TYPE_ENUM DBType)
{
DataInfo = GetDataObjectInfo(_TableName, DB, DBType);
TableName = _TableName;
}