/// <summary>
/// 获取表的约束条件
/// constraint_name - 约束名称
/// column_name - 约束的字段
/// constraint_type - 约束类型，P: 主键，U: 唯一键，R: 外键
/// </summary>
/// <param name="tableName"></param>
/// <returns></returns>
public ConstraintCollection GetTableConstraint(string tableName)
{
tableName = tableName.ToUpper();
string sql = "select col.constraint_name, col.column_name, c.constraint_type from user_cons_columns col, user_constraints c where col.constraint_name = c.constraint_name and c.constraint_type in ('P', 'U') and col.table_name = :table_name order by c.constraint_type, col.constraint_name, col.position";
try
{
DbParameter[] prams =
{
DbFactory <OracleConn, OracleFactory <OracleConn> > .MakeInParam(":table_name", OracleType.VarChar, 30, tableName),
};
IDbOperation db = new OracleExecute();
DataSet ds = db.FillDataset(sql, prams);
DataSet dsEmtpy = GetEmptyTable(tableName);
string prevType = "", prevColName = "";
List <DataColumn> cols = null;
foreach (DataRow dr in ds.Tables[0].Rows)
{
string constraintName = dr["constraint_name"].ToString();
string columnName = dr["column_name"].ToString();
string constraintType = dr["constraint_type"].ToString();
if (constraintType != prevType || constraintName != prevColName)
{
if (prevType.Length > 0)
{
UniqueConstraint uc = new UniqueConstraint(prevColName, cols.ToArray(), prevType == "P");
dsEmtpy.Tables[0].Constraints.Add(uc);
}
cols = new List <DataColumn>();
}
cols.Add(dsEmtpy.Tables[0].Columns[columnName]);
prevType = constraintType;
prevColName = constraintName;
}
if (prevType.Length > 0)
{
UniqueConstraint uc = new UniqueConstraint(prevColName, cols.ToArray(), prevType == "P");
dsEmtpy.Tables[0].Constraints.Add(uc);
}
return(dsEmtpy.Tables[0].Constraints);
}
catch (CustomDataException exdb)
{
throw exdb;
}
catch (System.Exception ex)
{
throw new CustomDataException(ex, sql);
}
}
public DataSet GetEmptyTable(string tableName)
{
string sql = "select * from " + tableName + " where 0 = 1";
try
{
IDbOperation db = new OracleExecute();
return(db.FillDataset(sql));
}
catch (System.Exception ex)
{
throw new CustomDataException(ex, sql);
}
}
/// <summary>
/// 获取某个表的信息
/// cname - 字段名
/// coltype - 字段类型
/// width - 字段长度
/// </summary>
/// <param name="tableName"></param>
/// <returns></returns>
public DataSet GetTableInfo(string tableName)
{
tableName = tableName.ToUpper();
string sql = "select cname, coltype, width from col where tname = :tname";
DbParameter[] dbParams =
{
DbFactory <OracleConn, OracleFactory <OracleConn> > .MakeInParam(":tname", OracleType.VarChar, 30, tableName),
};
IDbOperation db = new OracleExecute();
DataSet dataSet = db.FillDataset(sql, dbParams);
return(dataSet);
}
