public static DataTable ParseTableCreate(string statement)
{
try
{
List <string> warningMessages = new List <string>();
// Get first create statement
Match createRegexMatch = Regex.Match(statement, @"(?i)create[^;]+;");
if (!createRegexMatch.Success)
{
throw new Exception("Unable to parse create statement.");
}
// Get create statement parts
Match tableCreateRegexMatch = Regex.Match(createRegexMatch.Value, @"(?i)create[\s]+table[\s]+(?<TableSchema>[^.]+).(?<TableName>[^\s]+)\s*\((?<ColumnDefinitions>(?:.|\s)+)\);");
if (!tableCreateRegexMatch.Success)
{
throw new SqlScriptParsingException("Unable to parse table create statement.");
}
// Get table schema
Group matchSearch = tableCreateRegexMatch.Groups["TableSchema"];
if (!matchSearch.Success)
{
throw new SqlScriptParsingException("Unable to parse table create statement - TableSchema.");
}
string tableSchema = matchSearch.Value;
tableSchema = tableSchema.Replace("[", "").Replace("]", "");
// Get table name
matchSearch = tableCreateRegexMatch.Groups["TableName"];
if (!matchSearch.Success)
{
throw new SqlScriptParsingException("Unable to parse table create statement - TableName.");
}
string tableName = matchSearch.Value;
tableName = tableName.Replace("[", "").Replace("]", "");
// Get field definitions
matchSearch = tableCreateRegexMatch.Groups["ColumnDefinitions"];
if (!matchSearch.Success)
{
throw new SqlScriptParsingException("Unable to parse table create statement - ColumnDefinitions.");
}
string columnDefinitionsReplaceNewLine = matchSearch.Value.Replace("\r\n", "\n");
// Get individual column definitions
//MatchCollection columnDefinitionRegexMatch = Regex.Matches(matchSearch.Value, @"(?i)(?:(?<ColumnDefinition>[\s]*(?<ColumnName>[\S]+)[\s]+(?<DataType>[a-z2_]+)[\s]*(?<Precision>\((?:max|[0-9]+|[0-9]+,[\s]+[0-9])\))?[\s]+(?<Nullability>null|not[\s]null)?,?(?<ColumnConstraint>primary[\s]key|unique)?,?)|(?<ColumnConstraintDefinition>[\s]*constraint[\s]+[\S]+[\s]+(?:(?:(?:primary[\s]+key|unique|)[\s]+(?:clustered|non[\s]clustered)[\s]*(?:\([^\)]+\))?)|(?:foreign[\s]+key[\s]+[\S]+[\s]+references[\s]+[\S]+[\s]+\([^\)]+\))),?))");
//MatchCollection columnDefinitionRegexMatch = Regex.Matches(matchSearch.Value, @"(?i)(?:(?<ColumnDefinition>[\s]*(?<ColumnName>(?!constraint)[\S]+)[\s]+(?<DataType>[\[a-z2_\]]+)[\s]*(?<Precision>\((?:max|[0-9]+|[0-9]+,[\s]+[0-9])\))?[\s]+(?<Nullability>null|not[\s]null)?,?(?<ColumnConstraint>primary[\s]key|unique)?,?)|(?<ColumnConstraintDefinition>[\s]*constraint[\s]+(?<ConstraintName>[\S]+)[\s]+(?:(?:(?:(?<ConstraintType>primary[\s]+key)|unique|)[\s]+(?:clustered|non[\s]clustered)[\s]*(?:\((?<ConstraintColumnNames>[^\)]+)\))?)|(?:foreign[\s]+key[\s]+[\S]+[\s]+references[\s]+[\S]+[\s]+\([^\)]+\))),?))");
//MatchCollection columnDefinitionRegexMatch = Regex.Matches(matchSearch.Value, @"(?i)(?:(?<ColumnDefinition>\[?(?<ColumnName>(?!constraint)[^\s,\]]+)\]?[\s]+(?:\[?(?<ColumnDataType>[a-z2_]+)\]?)[\s]*(?:\((?<ColumnDataTypePrecision>(?:max|[0-9]+|[0-9]+,[\s]+[0-9]))\))?[\s]+(?<ColumnConstraint>(?:constraint[\s]+[\S]+[\s]+(?:default[\s]+[\S]+)?))?[\s]*(?<ColumnIdentity>identity[\s]*(?:\([0-9]+,[\s]*[0-9]+\))?)?[\s]*(?<ColumnNotForReplication>not[\s]+for[\s]+replication)?[\s]*(?<ColumnNullability>null|not[\s]null)?,?(?<TableConstraint>primary[\s]key|unique)?,?)|(?<TableConstraintDefinition>constraint[\s]+\[?(?<TableConstraintName>[^\s\]]+)\]?[\s]+(?:(?<TableConstraintUnique>(?<TableConstraintUniqueType>primary[\s]+key|unique)[\s]+(?:clustered|non[\s]clustered)[\s]*(?:\((?<TableConstraintColumnNames>[^\)]+)\))?)|(?<TableConstraintForeignKey>foreign[\s]+key[\s]+[\S]+[\s]+references[\s]+[\S]+[\s]+\([^\)]+\))),?))");
MatchCollection columnDefinitionRegexMatch = Regex.Matches(columnDefinitionsReplaceNewLine, @"(?im)(?:(?<TableConstraintDefinition>^\s*(?:constraint\s+\[?(?<TableConstraintName>[^\s\]]+)\]?\s+)?(?:(?<TableConstraintUnique>(?<TableConstraintUniqueType>primary\s+key|unique)\s+(?:clustered|non\s*clustered)\s*(?:\((?<TableConstraintColumnNames>[^\)]+)\))?)|(?<TableConstraintForeignKey>foreign[\s]+key[\s]+[\S]+[\s]+references[\s]+[\S]+[\s]+\([^\)]+\))),?)|(?<ColumnDefinition>^\s*\[?(?<ColumnName>(?!constraint)[^\s,\]]+)\]?[\s]+(?:\[?(?<ColumnDataType>[a-z2_]+)\]?)[\s]*(?:\((?<ColumnDataTypePrecision>(?:max|[0-9]+|[0-9]+,[\s]+[0-9]))\))?[\s]+(?<ColumnConstraint>(?:constraint[\s]+[\S]+[\s]+(?:default[\s]+[\S]+)?))?[\s]*(?<ColumnIdentity>identity[\s]*(?:\([0-9]+,[\s]*[0-9]+\))?)?[\s]*(?<ColumnNotForReplication>not[\s]+for[\s]+replication)?[\s]*(?<ColumnNullability>null|not[\s]null)?,?\s*$(?<TableConstraint>primary[\s]key|unique)?,?))");
if (columnDefinitionRegexMatch.Count < 0)
{
throw new SqlScriptParsingException("Unable to parse table create statement - individual column definitions.");
}
DataTable dataTable = new DataTable($"{tableSchema}.{tableName}");
DataColumn dataColumn;
// Iterate through individual column definitions and create new data column objects
foreach (Match definition in columnDefinitionRegexMatch)
{
// Check whether definition is table constraint
if (definition.Groups["TableConstraintDefinition"].Success)
{
// Check if primary key
matchSearch = definition.Groups["TableConstraintUniqueType"];
if (matchSearch.Success && matchSearch.Value.ToLower().Contains("primary"))
{
matchSearch = definition.Groups["TableConstraintColumnNames"];
if (matchSearch.Success)
{
List <DataColumn> primaryKeyColumns = new List <DataColumn>();
MatchCollection primaryKeyColumnNameMatchCollection = Regex.Matches(matchSearch.Value, @"(?i)\[?(?<PrimaryKeyColumnName>[^\s\]]+)\]?[\s]+(?:asc|desc)");
foreach (Match primaryKeyColumnNameMatch in primaryKeyColumnNameMatchCollection)
{
// Get primary key column name
matchSearch = primaryKeyColumnNameMatch.Groups["PrimaryKeyColumnName"];
if (!matchSearch.Success)
{
throw new SqlScriptParsingException("Unable to parse table primary key - ColumnName.");
}
string primaryKeyColumnName = matchSearch.Value;
primaryKeyColumns.Add(dataTable.Columns[primaryKeyColumnName]);
}
dataTable.PrimaryKey = primaryKeyColumns.ToArray();
}
}
}
else
{
// Get column name
matchSearch = definition.Groups["ColumnName"];
if (!matchSearch.Success)
{
throw new SqlScriptParsingException("Unable to parse table create statement - individual column definitions - ColumnName.");
}
string columnName = matchSearch.Value;
// Get data type
matchSearch = definition.Groups["ColumnDataType"];
if (!matchSearch.Success)
{
throw new SqlScriptParsingException("Unable to parse table create statement - individual column definitions - DataType.");
}
string dataType = matchSearch.Value;
// Get precision
string precision = string.Empty;
matchSearch = definition.Groups["ColumnDataTypePrecision"];
if (matchSearch.Success)
{
precision = matchSearch.Value;
precision = precision.Replace("(", "").Replace(")", "");
}
else
{
warningMessages.Add($"Column definition parsing warning - Could not determine Precision for: \"{definition.Value}\".");
}
// Get nullability
string nullability = string.Empty;
matchSearch = definition.Groups["ColumnNullability"];
if (matchSearch.Success)
{
nullability = matchSearch.Value;
}
else
{
warningMessages.Add($"Could not determine - Nullability.");
}
Type nativeDataType = SqlStatementParser.SqlDbEngineTypeToNativeType(dataType);
// Create new data column
dataColumn = new DataColumn(columnName, nativeDataType);
dataColumn.ExtendedProperties.Add("SqlDbEngineType", $"{dataType}{(string.IsNullOrWhiteSpace(precision) ? string.Empty : $"({precision})")}");
if (nativeDataType == typeof(string) && precision.ToLower() != "max")
{
dataColumn.MaxLength = int.Parse(precision);
}
dataColumn.AllowDBNull = string.IsNullOrWhiteSpace(nullability) || nullability.ToLower() == "null";
dataTable.Columns.Add(dataColumn);
}
}
return(dataTable);
}
