/// <summary>
/// 条件比较
/// </summary>
private static bool GetTFilterOk(string where, int quoteIndex, string sign, Op op, MDataColumn mdc, out TFilter tFilter)
{
bool result = false;
tFilter = null;
int index = where.ToLower().IndexOf(sign, 0, quoteIndex > 0 ? quoteIndex : where.Length);
if (index > 0)
{
string columnAName = where.Substring(0, index).Trim();
int columnAIndex = mdc.GetIndex(columnAName);
string valueB = where.Substring(index + sign.Length).Trim(' ', '\'').Replace("''", "'");
if (op == Op.In || op == Op.NotIn)
{
valueB = ',' + valueB.TrimStart('(', ')').Replace("'", "") + ",";//去除单引号。
}
int columnBIndex = -1;
if (quoteIndex == 0 && mdc.Contains(valueB)) //判断右侧的是否列名。
{
columnBIndex = mdc.GetIndex(valueB);
}
tFilter = new TFilter(Ao.None, columnAName, columnAIndex, op, valueB, columnBIndex);
if (columnBIndex == -1 && !string.IsNullOrEmpty(Convert.ToString(valueB)))//右侧是值类型，转换值的类型。
{
if (columnAIndex > -1 && DataType.GetGroup(mdc[columnAIndex].SqlType) == 3)//bool型
{
switch (Convert.ToString(tFilter._valueB).ToLower())
{
case "true":
case "1":
case "on":
tFilter._valueB = true;
break;
case "false":
case "0":
case "":
tFilter._valueB = false;
break;
default:
tFilter._valueB = null;
break;
}
}
else
{
try
{
tFilter._valueB = StaticTool.ChangeType(tFilter._valueB, columnAIndex > -1 ? typeof(string) : mdc[columnAIndex].ValueType);
}
catch
{
}
}
}
result = true;
}
return result;
}
/// <summary>
/// 获取指定的表架构生成的SQL(Alter Table)语句
/// </summary>
public static List <string> AlterTableSql(string tableName, MDataColumn columns, string conn)
{
List <string> sql = new List <string>();
DbBase helper = DalCreate.CreateDal(conn);
helper.ChangeDatabaseWithCheck(tableName);//检测dbname.dbo.tablename的情况
if (!helper.TestConn())
{
helper.Dispose();
return(sql);
}
DalType dalType = helper.dalType;
string version = helper.Version;
MDataColumn dbColumn = TableSchema.GetColumns(tableName, ref helper);//获取数据库的列结构
helper.Dispose();
//开始比较异同
List <MCellStruct> primaryKeyList = new List <MCellStruct>();
string tbName = SqlFormat.Keyword(tableName, dalType);
string alterTable = "alter table " + tbName;
foreach (MCellStruct ms in columns)//遍历新的结构
{
string cName = SqlFormat.Keyword(ms.ColumnName, dalType);
if (ms.AlterOp != AlterOp.None)
{
bool isContains = dbColumn.Contains(ms.ColumnName);
if (ms.AlterOp == AlterOp.Drop)
{
#region MyRegion
if (isContains)
{
switch (dalType)
{
case DalType.MsSql:
case DalType.Access:
case DalType.MySql:
case DalType.Oracle:
if (dalType == DalType.MsSql)
{
sql.Add(@"declare @name varchar(50) select @name =b.name from sysobjects b join syscolumns a on b.id = a.cdefault
where a.id = object_id('" + tableName + "') and a.name ='" + ms.ColumnName + "'if(@name!='') begin EXEC('alter table Base_Button drop constraint '+ @name) end");
}
sql.Add(alterTable + " drop column " + cName);
break;
case DalType.Sybase:
sql.Add(alterTable + " drop " + cName);
break;
}
}
#endregion
}
else if (ms.AlterOp == AlterOp.Rename)
{
#region MyRegion
if (!string.IsNullOrEmpty(ms.OldName) && ms.OldName != ms.ColumnName && !isContains)
{
string oName = SqlFormat.Keyword(ms.OldName, dalType);
switch (dalType)
{
case DalType.MsSql:
sql.Add("exec sp_rename '" + tbName + "." + oName + "', '" + ms.ColumnName + "', 'column'");
break;
case DalType.Sybase:
sql.Add("exec sp_rename \"" + tableName + "." + ms.OldName + "\", " + ms.ColumnName);
break;
case DalType.MySql:
sql.Add(alterTable + " change " + oName + " " + GetKey(ms, dalType, ref primaryKeyList, version).TrimEnd(','));
break;
case DalType.Oracle:
sql.Add(alterTable + " rename column " + oName + " to " + cName);
break;
}
}
#endregion
}
else if (ms.AlterOp == AlterOp.AddOrModify)
{
string alterSql = SqlFormat.Keyword(ms.ColumnName, dalType) + " " + DataType.GetDataType(ms, dalType, version);
//智能判断
if (isContains) // 存在，则修改
{
//检测是否相同
MCellStruct dbStruct = dbColumn[ms.ColumnName];
if (dbStruct.IsCanNull != ms.IsCanNull || dbStruct.SqlType != ms.SqlType || dbStruct.MaxSize != ms.MaxSize || dbStruct.Scale != ms.Scale)
{
string modify = "";
switch (dalType)
{
case DalType.Oracle:
case DalType.Sybase:
modify = " modify ";
break;
case DalType.MySql:
modify = " change " + cName + " ";
break;
case DalType.MsSql:
case DalType.Access:
modify = " alter column ";
break;
}
if (ms.IsCanNull != dbStruct.IsCanNull)
{
alterSql += (ms.IsCanNull ? " NULL" : " NOT NULL");
}
sql.Add(alterTable + modify + alterSql);
}
}
else //不在，则添加
{
sql.Add(alterTable + " add " + GetKey(ms, dalType, ref primaryKeyList, version).TrimEnd(','));
if (!string.IsNullOrEmpty(ms.Description))
{
string description = SqlCreateForSchema.GetTableDescriptionSql(tableName, ms, dalType, true);
if (!string.IsNullOrEmpty(description))
{
sql.Add(description);
}
}
}
}
}
}
return(sql);
}
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))//�������ȡ
{
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);//��ͼ�������.���ģ��������
string fileName = dbHelper.Con.DataSource + tableName + (dalType == DalType.Txt ? ".txt" : ".xml");
return MDataColumn.CreateFrom(fileName);
}
MDataColumn mdcs = new MDataColumn();
mdcs.dalType = dbHelper.dalType;
//���table��helper����ͬһ����
DbBase helper = dbHelper.ResetDbBase(tableName);
helper.IsAllowRecordSql = false;//�ڲ�ϵͳ������¼SQL��ṹ��䡣
try
{
bool isView = tableName.Contains(" ");//�Ƿ���ͼ��
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"))
{
//�Ȼ�ȡͬ��ʣ�����Ƿ���
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)//�����
{
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�ij��ȿ��ܴ���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)//Ĭ��û���������ֻ�ܸ�������жϡ�
{
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�ij��ȿ��ܴ���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;//�ָ���¼SQL��ṹ��䡣
if (helper != dbHelper)
{
helper.Dispose();
}
}
if (mdcs.Count > 0)
{
//�Ƴ�����־���У�
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;
}
public static MDataColumn GetColumns(string tableName, string conn)
{
string key = GetSchemaKey(tableName, conn);
if (_ColumnCache.ContainsKey(key))
{
return(_ColumnCache[key].Clone());
}
string fixName;
conn = CrossDB.GetConn(tableName, out fixName, conn ?? AppConfig.DB.DefaultConn);
tableName = fixName;
if (conn == null)
{
return(null);
}
MDataColumn mdcs = null;
using (DalBase dbHelper = DalCreate.CreateDal(conn))
{
DataBaseType dalType = dbHelper.DataBaseType;
#region 文本数据库处理。
if (dalType == DataBaseType.Txt || dalType == DataBaseType.Xml)
{
if (!tableName.Contains(" ")) // || tableName.IndexOfAny(Path.GetInvalidPathChars()) == -1
{
tableName = SqlFormat.NotKeyword(tableName); //处理database..tableName;
tableName = Path.GetFileNameWithoutExtension(tableName); //视图表，带“.“的，会出问题
string fileName = dbHelper.Con.DataSource + tableName + (dalType == DataBaseType.Txt ? ".txt" : ".xml");
mdcs = MDataColumn.CreateFrom(fileName);
mdcs.DataBaseType = dalType;
return(mdcs);
}
return(null);//处理视图
}
#endregion
mdcs = new MDataColumn();
mdcs.TableName = tableName;
mdcs.DataBaseType = dalType;
tableName = SqlFormat.Keyword(tableName, dbHelper.DataBaseType);//加上关键字：引号
//如果table和helper不在同一个库
DalBase helper = dbHelper.ResetDalBase(tableName);
helper.IsRecordDebugInfo = 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 = CrossDB.Exists(tableName, "V", conn);
}
if (!isView)
{
TableInfo info = CrossDB.GetTableInfoByName(mdcs.TableName, conn);
if (info != null)
{
mdcs.Description = info.Description;
}
}
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 DataBaseType.MsSql:
case DataBaseType.Oracle:
case DataBaseType.MySql:
case DataBaseType.Sybase:
case DataBaseType.PostgreSQL:
#region Sql
string sql = string.Empty;
if (dalType == DataBaseType.MsSql)
{
#region 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(MSSQL_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.DataBaseName);
#endregion
}
else if (dalType == DataBaseType.MySql)
{
sql = GetMySqlColumns(helper.DataBaseName);
}
else if (dalType == DataBaseType.Oracle)
{
tableName = tableName.ToUpper(); //Oracle转大写。
//先获取同义词，不检测是否跨库
string realTableName = Convert.ToString(helper.ExeScalar(string.Format(Oracle_SynonymsName, SqlFormat.NotKeyword(tableName)), false));
if (!string.IsNullOrEmpty(realTableName))
{
tableName = realTableName;
}
sql = GetOracleColumns();
}
else if (dalType == DataBaseType.Sybase)
{
tableName = SqlFormat.NotKeyword(tableName);
sql = GetSybaseColumns();
}
else if (dalType == DataBaseType.PostgreSQL)
{
sql = GetPostgreColumns();
}
helper.AddParameters("TableName", SqlFormat.NotKeyword(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.DataBaseType);
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 DataBaseType.MsSql:
case DataBaseType.MySql:
case DataBaseType.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 == DataBaseType.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 DataBaseType.SQLite:
#region SQlite
if (helper.Con.State != ConnectionState.Open)
{
helper.Con.Open();
}
DataTable sqliteDt = helper.Con.GetSchema("Columns", new string[] { null, null, SqlFormat.NotKeyword(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 == DBNull.Value)
{
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 DataBaseType.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;
}
}
}
catch (Exception err)
{
helper.DebugInfo.Append(err.Message);
}
}
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 (!_ColumnCache.ContainsKey(key))
{
_ColumnCache.Add(key, mdcs.Clone());
}
return(mdcs);
}
/// <summary>
/// 进行列修正（只有移除 和 修正类型，若无主键列，则新增主键列）
/// </summary>
private void FixTable(MDataColumn column)
{
if (column.Count > 0)
{
bool tableIsChange = false;
for (int i = mdt.Columns.Count - 1; i >= 0; i--)
{
if (!column.Contains(mdt.Columns[i].ColumnName))//没有此列
{
if (!tableIsChange)
{
mdt = mdt.Clone();//列需要变化时，克隆一份，不变更原有数据。
tableIsChange = true;
}
mdt.Columns.RemoveAt(i);
}
else
{
MCellStruct ms = column[mdt.Columns[i].ColumnName];//新表的字段
Type valueType = mdt.Columns[i].ValueType;//存档的字段的值的原始类型。
bool isChangeType = mdt.Columns[i].SqlType != ms.SqlType;
mdt.Columns[i].Load(ms);
if (isChangeType)
{
//修正数据的数据类型。
foreach (MDataRow row in mdt.Rows)
{
row[i].FixValue();//重新自我赋值修正数据类型。
}
}
}
}
//主键检测，若没有，则补充主键
if (column.JointPrimary != null && column.JointPrimary.Count > 0)
{
if (!mdt.Columns.Contains(column[0].ColumnName) && (column[0].IsPrimaryKey || column[0].IsAutoIncrement))
{
MCellStruct ms = column[0].Clone();
mdt = mdt.Clone();//列需要变化时，克隆一份，不变更原有数据。
ms.MDataColumn = null;
mdt.Columns.Insert(0, ms);
}
}
}
}
