/// <summary>
/// Iterates a database one table at a time building the dependency tree for each table and outputing the tree to the screen.
/// </summary>
/// <param name="database"></param>
public void BuildDependencyTree(DatabaseContainer database)
{
Resolver resolver = new Resolver();
this._database = database;
List <DependencyTable> convertedTables = resolver.ConvertToDependencyTables(database);
string output = string.Empty;
Action <DependencyTable> recursivePrintTable = null;
int depth = 0;
recursivePrintTable = (t) =>
{
t.Columns.ForEach(c =>
{
string refersTo = string.Empty;
if (c.RefersTo != null)
{
refersTo += $" > {c.RefersTo.Table.Schema}.{ c.RefersTo.Table.Name}.{ c.RefersTo.Name}";
}
string tabs = "";
for (int i = 0; i < depth; i++)
{
tabs += "---";
}
string item = $"{tabs} {t.Schema }.{t.Name}.{c.Name} {refersTo}" + Environment.NewLine;
output += item;
if (c.RefersTo != null)
{
depth++;
recursivePrintTable(c.RefersTo.Table);
depth--;
}
});
};
string currentTable = string.Empty;
convertedTables.ForEach(t =>
{
if (t.Name != currentTable)
{
output += Environment.NewLine;
}
currentTable = t.Name;
resolver.ClearValues(t);
resolver.BuildDependsOnList(this._database.GetForeignKeys(), convertedTables, t);
recursivePrintTable(t);
});
textBoxOutput.Text = output;
}
public string GenerateInsertStatmentsForDatabase(DatabaseContainer database)
{
TestDataGenerator generator = new TestDataGenerator(new TestDataRepository());
Resolver resolver = new Resolver();
/* Convert the tables to a dependency table list is really just our database with dependency tables instead of table */
List <DependencyTable> convertedTables = resolver.ConvertToDependencyTables(database);
string output = string.Empty;
//This must be defined like this for the recursive call to work inside the action. It's a .NET quirk.
Action <DependencyTable> recursiveGenerateInsert = null;
/*
* primaryKeys tracks what the auto incremnted primary key is for each table while we're inserting
*
*/
Dictionary <Tuple <string, string>, int> primaryKeys = new Dictionary <Tuple <string, string>, int>(); //key is schema:table
/*
* fieldTypeIndex tracks the index in the test generator for unique indexes.
* So we have a list of unique guids in our test data array and we are inserting into a guid
* column that is unique. We can't insert the same quid twice. So we use this index which is keyed by schema:table:column
* to track which entry in the test data array we're on.
*
*/
Dictionary <Tuple <string, string, string>, int> fieldTypeIndex = new Dictionary <Tuple <string, string, string>, int>(); // keys is schema:tablecolumn
// this iterated the table columns and walks the tree using the RefersTo field on the table to find the next node.
// When it gets to the bottom leaf of the tree it generates the insert SQL and then returns
recursiveGenerateInsert = (t) =>
{
Dictionary <string, int> explicitForeignKeys = new Dictionary <string, int>();
t.Columns.ForEach(c =>
{
if (c.RefersTo != null) // if there is a table we reference
{
if (c.RefersTo.Table != t)
{
recursiveGenerateInsert(c.RefersTo.Table); // iterate all of the columns
}
else
{
// this is a hack. When we insert into a table with a foreign key to itself we need a value so
// we're just hard coding it to one for now
primaryKeys[Tuple.Create <string, string>(c.RefersTo.Table.Schema, c.RefersTo.Table.Name)] = 1;
}
/* Set the value for the column that is a foreign key explicit by looking for the current primaryKey for the referenced table
*
*/
explicitForeignKeys[c.Name] = primaryKeys[Tuple.Create <string, string>(c.RefersTo.Table.Schema, c.RefersTo.Table.Name)];
}
});
var schema = database.Schemas.First(x => x.Name.ToUpper() == t.Schema.ToUpper());
var table = schema.Tables.First(x => x.Name.ToUpper() == t.Name.ToUpper());
int primaryKey = 0;
if (primaryKeys.Keys.Any(k => k.Item1 == schema.Name && k.Item2 == table.Name)) // a primary key for this table exists
{
primaryKey = primaryKeys[Tuple.Create <string, string>(schema.Name, table.Name)] + 1; // increment it and return the new value
primaryKeys[Tuple.Create <string, string>(schema.Name, table.Name)] = primaryKey;
}
else
{
primaryKey = 1;// this table doesn't exist. Create a dictionary entry and set it to 1
primaryKeys[Tuple.Create <string, string>(schema.Name, table.Name)] = primaryKey;
}
output += generator.GeneratInsert(schema, table, primaryKey, fieldTypeIndex, explicitForeignKeys);
};
convertedTables.ForEach(t =>
{
resolver.ClearValues(t); // clear the RefersTo for all of the tables.
// Build the dependency tree for this table
resolver.BuildDependsOnList(database.GetForeignKeys(), convertedTables, t);
// Iterate this tables columns and any tables those columns reference
recursiveGenerateInsert(t);
});
return(output);
}
