/// <summary>
/// Serializes the schema of a DataTable into to a Tiferix JsonTableSchema object which can then be stored in a JsonDataSetSchema file.
/// This version of the function will also be used internally to serialize a DataSet or DataTable into a JsonDataSetSchema/JsonTableSchema
/// object before writing the schema information to a data stream or file on disk.
/// </summary>
/// <param name="dtSchema">DataTable with schema to be serialized to JsonTableSchema object.</param>
/// <returns></returns>
public virtual JsonTableSchema SerializeTableSchema(DataTable dtSchema)
{
try
{
JsonTableSchema tblSchema = new Data.JsonTableSchema();
foreach (DataColumn column in dtSchema.Columns)
{
JsonColumnSchema colSchema = new JsonColumnSchema();
colSchema.ColumnName = column.ColumnName;
colSchema.DataType = column.DataType;
colSchema.Unique = column.Unique;
colSchema.MaxLength = column.MaxLength;
colSchema.AllowDBNull = column.AllowDBNull;
colSchema.AutoIncrement = column.AutoIncrement;
colSchema.AutoIncrementSeed = column.AutoIncrementSeed;
colSchema.AutoIncrementStep = column.AutoIncrementStep;
colSchema.Caption = column.Caption;
colSchema.DateTimeMode = column.DateTimeMode;
colSchema.DefaultValue = column.DefaultValue;
colSchema.Expression = column.Expression;
colSchema.ReadOnly = column.ReadOnly;
if (dtSchema.PrimaryKey != null)
{
if (dtSchema.PrimaryKey.Contains(column))
{
colSchema.PrimaryKey = true;
}
}//end if
tblSchema.Columns.Add(colSchema);
}//next colSchema
return(tblSchema);
}
catch (Exception err)
{
ErrorHandler.ShowErrorMessage(err, "Error in SerializeTableSchema Overload 1 function of JsonDataSetSchemaSerializer class.");
return(null);
}
}
/// <summary>
/// An internal function that will use a JsonDataWriter object to serialize the data stored in a JsonTableSchema object to a JsonDataSetSchema
/// data stream or file. The JsonTableSchema object will have been previously loaded before the function is called and the JsonDataWriter
/// will be positioned at the next table schema record in the data stream.
/// </summary>
/// <param name="jwrtSchema">JsonDataWriter object used for serializing the schema information of the DataTable to the JsonDataSetSchema
/// data stream.</param>
/// <param name="tblSchema">The JsonTableSchema object containing all the schema information of a DataTable to serialize to the JsonDataSetSchema
/// data stream.</param>
protected virtual void SerializeTableSchema(JsonDataWriter jwrtSchema, JsonTableSchema tblSchema)
{
try
{
//Writes opening '{' object bracket of either Tables schema array (of DataSet Schema file) or of the entire table schema file.
jwrtSchema.WriteBeginObject();
//"Table": "Table Name",
jwrtSchema.WritePropDataValue("Table", tblSchema.TableName, true);
//"Columns": [
jwrtSchema.WritePropertyName("Columns");
jwrtSchema.WriteBeginArray(true);
//Loops through each column of the table schema and serializes the data to the stream.
for (int iColIndex = 0; iColIndex < tblSchema.Columns.Count; iColIndex++)
{
JsonColumnSchema colSchema = tblSchema.Columns[iColIndex];
//Write opening '{' object bracket for the column schema.
jwrtSchema.WriteBeginObject();
jwrtSchema.WritePropDataValue("ColumnName", colSchema.ColumnName, true);
jwrtSchema.WritePropDataValue("DataType", JsonDataUtils.ConvertToJsonDataType(colSchema.DataType), true);
jwrtSchema.WritePropDataValue("PrimaryKey", colSchema.PrimaryKey, true);
jwrtSchema.WritePropDataValue("Unique", colSchema.Unique, true);
jwrtSchema.WritePropDataValue("MaxLength", colSchema.MaxLength, true);
jwrtSchema.WritePropDataValue("AllowDBNull", colSchema.AllowDBNull, true);
jwrtSchema.WritePropDataValue("AutoIncrement", colSchema.AutoIncrement, true);
jwrtSchema.WritePropDataValue("AutoIncrementSeed", colSchema.AutoIncrementSeed, true);
jwrtSchema.WritePropDataValue("AutoIncrementStep", colSchema.AutoIncrementStep, true);
jwrtSchema.WritePropDataValue("Caption", colSchema.Caption, true);
jwrtSchema.WritePropDataValue("DateTimeMode", colSchema.DateTimeMode.ToString(), true);
if (colSchema.DefaultValue != null)
{
jwrtSchema.WritePropDataValue("DefaultValue", colSchema.DefaultValue.ToString(), true);
}
else
{
jwrtSchema.WritePropDataNullValue("DefaultValue", true);
}
jwrtSchema.WritePropDataValue("ReadOnly", colSchema.ReadOnly);
//Write closing '}' object bracket for the column schema.
jwrtSchema.WriteEndObject();
if (iColIndex < tblSchema.Columns.Count - 1)
{
//Writes comma field delimiter after the column end object to separate each column record.
jwrtSchema.WriteFieldDelimiter();
}
else
{
//The final column record will have a closing object bracket without a comma.
jwrtSchema.WriteNewLine();
}
}//next iColIndex
//Writes closing ']' of columns array.
jwrtSchema.WriteEndArray();
//Writes closing '}' object bracket of either Tables schema array (of DataSet Schema file) or of the entire table schema file.
jwrtSchema.WriteEndObject();
}
catch (Exception err)
{
ErrorHandler.ShowErrorMessage(err, "Error in SerializeTableSchema Overload 2 function of JsonDataSetSchemaSerializer class.");
}
}
