public static MDataColumn GetColumns(string tableName, ref DbBase dbHelper)
{
tableName = Convert.ToString(SqlCreate.SqlToViewSql(tableName));
DalType dalType = dbHelper.dalType;
tableName = SqlFormat.Keyword(tableName, dbHelper.dalType);
string key = GetSchemaKey(tableName, dbHelper.DataBase, dbHelper.dalType);
if (CacheManage.LocalInstance.Contains(key))//缓存里获取
{
return(CacheManage.LocalInstance.Get <MDataColumn>(key).Clone());
}
switch (dalType)
{
case DalType.SQLite:
case DalType.MySql:
tableName = SqlFormat.NotKeyword(tableName);
break;
case DalType.Txt:
case DalType.Xml:
tableName = Path.GetFileNameWithoutExtension(tableName); //视图表，带“.“的，会出问题
string fileName = dbHelper.Con.DataSource + tableName + (dalType == DalType.Txt ? ".txt" : ".xml");
MDataColumn mdc = MDataColumn.CreateFrom(fileName);
mdc.dalType = dalType;
return(mdc);
}
MDataColumn mdcs = new MDataColumn();
mdcs.dalType = dbHelper.dalType;
//如果table和helper不在同一个库
DbBase helper = dbHelper.ResetDbBase(tableName);
helper.IsAllowRecordSql = false;//内部系统，不记录SQL表结构语句。
try
{
bool isView = tableName.Contains(" ");//是否视图。
if (!isView)
{
isView = Exists("V", tableName, ref helper);
}
MCellStruct mStruct = null;
SqlDbType sqlType = SqlDbType.NVarChar;
if (isView)
{
string sqlText = SqlFormat.BuildSqlWithWhereOneEqualsTow(tableName);// string.Format("select * from {0} where 1=2", tableName);
mdcs = GetViewColumns(sqlText, ref helper);
}
else
{
mdcs.AddRelateionTableName(SqlFormat.NotKeyword(tableName));
switch (dalType)
{
case DalType.MsSql:
case DalType.Oracle:
case DalType.MySql:
case DalType.Sybase:
#region Sql
string sql = string.Empty;
if (dalType == DalType.MsSql)
{
string dbName = null;
if (!helper.Version.StartsWith("08"))
{
//先获取同义词，检测是否跨库
string realTableName = Convert.ToString(helper.ExeScalar(string.Format(SynonymsName, SqlFormat.NotKeyword(tableName)), false));
if (!string.IsNullOrEmpty(realTableName))
{
string[] items = realTableName.Split('.');
tableName = realTableName;
if (items.Length > 0) //跨库了
{
dbName = realTableName.Split('.')[0];
}
}
}
sql = GetMSSQLColumns(helper.Version.StartsWith("08"), dbName ?? helper.DataBase);
}
else if (dalType == DalType.MySql)
{
sql = GetMySqlColumns(helper.DataBase);
}
else if (dalType == DalType.Oracle)
{
sql = GetOracleColumns();
}
else if (dalType == DalType.Sybase)
{
tableName = SqlFormat.NotKeyword(tableName);
sql = GetSybaseColumns();
}
helper.AddParameters("TableName", tableName, DbType.String, 150, ParameterDirection.Input);
DbDataReader sdr = helper.ExeDataReader(sql, false);
if (sdr != null)
{
long maxLength;
bool isAutoIncrement = false;
short scale = 0;
string sqlTypeName = string.Empty;
while (sdr.Read())
{
short.TryParse(Convert.ToString(sdr["Scale"]), out scale);
if (!long.TryParse(Convert.ToString(sdr["MaxSize"]), out maxLength)) //mysql的长度可能大于int.MaxValue
{
maxLength = -1;
}
else if (maxLength > int.MaxValue)
{
maxLength = int.MaxValue;
}
sqlTypeName = Convert.ToString(sdr["SqlType"]);
sqlType = DataType.GetSqlType(sqlTypeName);
isAutoIncrement = Convert.ToBoolean(sdr["IsAutoIncrement"]);
mStruct = new MCellStruct(mdcs.dalType);
mStruct.ColumnName = Convert.ToString(sdr["ColumnName"]).Trim();
mStruct.OldName = mStruct.ColumnName;
mStruct.SqlType = sqlType;
mStruct.IsAutoIncrement = isAutoIncrement;
mStruct.IsCanNull = Convert.ToBoolean(sdr["IsNullable"]);
mStruct.MaxSize = (int)maxLength;
mStruct.Scale = scale;
mStruct.Description = Convert.ToString(sdr["Description"]);
mStruct.DefaultValue = SqlFormat.FormatDefaultValue(dalType, sdr["DefaultValue"], 0, sqlType);
mStruct.IsPrimaryKey = Convert.ToString(sdr["IsPrimaryKey"]) == "1";
switch (dalType)
{
case DalType.MsSql:
case DalType.MySql:
case DalType.Oracle:
mStruct.IsUniqueKey = Convert.ToString(sdr["IsUniqueKey"]) == "1";
mStruct.IsForeignKey = Convert.ToString(sdr["IsForeignKey"]) == "1";
mStruct.FKTableName = Convert.ToString(sdr["FKTableName"]);
break;
}
mStruct.SqlTypeName = sqlTypeName;
mStruct.TableName = SqlFormat.NotKeyword(tableName);
mdcs.Add(mStruct);
}
sdr.Close();
if (dalType == DalType.Oracle && mdcs.Count > 0) //默认没有自增概念，只能根据情况判断。
{
MCellStruct firstColumn = mdcs[0];
if (firstColumn.IsPrimaryKey && firstColumn.ColumnName.ToLower().Contains("id") && firstColumn.Scale == 0 && DataType.GetGroup(firstColumn.SqlType) == 1 && mdcs.JointPrimary.Count == 1)
{
firstColumn.IsAutoIncrement = true;
}
}
}
#endregion
break;
case DalType.SQLite:
#region SQlite
if (helper.Con.State != ConnectionState.Open)
{
helper.Con.Open();
}
DataTable sqliteDt = helper.Con.GetSchema("Columns", new string[] { null, null, tableName });
if (!helper.isOpenTrans)
{
helper.Con.Close();
}
int size;
short sizeScale;
string dataTypeName = string.Empty;
foreach (DataRow row in sqliteDt.Rows)
{
object len = row["NUMERIC_PRECISION"];
if (len == null)
{
len = row["CHARACTER_MAXIMUM_LENGTH"];
}
short.TryParse(Convert.ToString(row["NUMERIC_SCALE"]), out sizeScale);
if (!int.TryParse(Convert.ToString(len), out size)) //mysql的长度可能大于int.MaxValue
{
size = -1;
}
dataTypeName = Convert.ToString(row["DATA_TYPE"]);
if (dataTypeName == "text" && size > 0)
{
sqlType = DataType.GetSqlType("varchar");
}
else
{
sqlType = DataType.GetSqlType(dataTypeName);
}
//COLUMN_NAME,DATA_TYPE,PRIMARY_KEY,IS_NULLABLE,CHARACTER_MAXIMUM_LENGTH AUTOINCREMENT
mStruct = new MCellStruct(row["COLUMN_NAME"].ToString(), sqlType, Convert.ToBoolean(row["AUTOINCREMENT"]), Convert.ToBoolean(row["IS_NULLABLE"]), size);
mStruct.Scale = sizeScale;
mStruct.Description = Convert.ToString(row["DESCRIPTION"]);
mStruct.DefaultValue = SqlFormat.FormatDefaultValue(dalType, row["COLUMN_DEFAULT"], 0, sqlType); //"COLUMN_DEFAULT"
mStruct.IsPrimaryKey = Convert.ToBoolean(row["PRIMARY_KEY"]);
mStruct.SqlTypeName = dataTypeName;
mStruct.TableName = SqlFormat.NotKeyword(tableName);
mdcs.Add(mStruct);
}
#endregion
break;
case DalType.Access:
#region Access
DataTable keyDt, valueDt;
string sqlText = SqlFormat.BuildSqlWithWhereOneEqualsTow(tableName);// string.Format("select * from {0} where 1=2", tableName);
OleDbConnection con = new OleDbConnection(helper.Con.ConnectionString);
OleDbCommand com = new OleDbCommand(sqlText, con);
con.Open();
keyDt = com.ExecuteReader(CommandBehavior.KeyInfo).GetSchemaTable();
valueDt = con.GetOleDbSchemaTable(OleDbSchemaGuid.Columns, new object[] { null, null, SqlFormat.NotKeyword(tableName) });
con.Close();
con.Dispose();
if (keyDt != null && valueDt != null)
{
string columnName = string.Empty, sqlTypeName = string.Empty;
bool isKey = false, isCanNull = true, isAutoIncrement = false;
int maxSize = -1;
short maxSizeScale = 0;
SqlDbType sqlDbType;
foreach (DataRow row in keyDt.Rows)
{
columnName = row["ColumnName"].ToString();
isKey = Convert.ToBoolean(row["IsKey"]); //IsKey
isCanNull = Convert.ToBoolean(row["AllowDBNull"]); //AllowDBNull
isAutoIncrement = Convert.ToBoolean(row["IsAutoIncrement"]);
sqlTypeName = Convert.ToString(row["DataType"]);
sqlDbType = DataType.GetSqlType(sqlTypeName);
short.TryParse(Convert.ToString(row["NumericScale"]), out maxSizeScale);
if (Convert.ToInt32(row["NumericPrecision"]) > 0) //NumericPrecision
{
maxSize = Convert.ToInt32(row["NumericPrecision"]);
}
else
{
long len = Convert.ToInt64(row["ColumnSize"]);
if (len > int.MaxValue)
{
maxSize = int.MaxValue;
}
else
{
maxSize = (int)len;
}
}
mStruct = new MCellStruct(columnName, sqlDbType, isAutoIncrement, isCanNull, maxSize);
mStruct.Scale = maxSizeScale;
mStruct.IsPrimaryKey = isKey;
mStruct.SqlTypeName = sqlTypeName;
mStruct.TableName = SqlFormat.NotKeyword(tableName);
foreach (DataRow item in valueDt.Rows)
{
if (columnName == item[3].ToString()) //COLUMN_NAME
{
if (item[8].ToString() != "")
{
mStruct.DefaultValue = SqlFormat.FormatDefaultValue(dalType, item[8], 0, sqlDbType); //"COLUMN_DEFAULT"
}
break;
}
}
mdcs.Add(mStruct);
}
}
#endregion
break;
}
}
helper.ClearParameters();
}
catch (Exception err)
{
helper.debugInfo.Append(err.Message);
}
finally
{
helper.IsAllowRecordSql = true;//恢复记录SQL表结构语句。
if (helper != dbHelper)
{
helper.Dispose();
}
}
if (mdcs.Count > 0)
{
//移除被标志的列：
string[] fields = AppConfig.DB.HiddenFields.Split(',');
foreach (string item in fields)
{
string field = item.Trim();
if (!string.IsNullOrEmpty(field) & mdcs.Contains(field))
{
mdcs.Remove(field);
}
}
}
if (!CacheManage.LocalInstance.Contains(key))
{
CacheManage.LocalInstance.Add(key, mdcs.Clone());
}
return(mdcs);
}