/// <summary>
/// Creates a SQL Statement for insert-all operation.
/// </summary>
/// <param name="queryBuilder">The query builder to be used.</param>
/// <param name="tableName">The name of the target table.</param>
/// <param name="fields">The list of fields to be inserted.</param>
/// <param name="batchSize">The batch size of the operation.</param>
/// <param name="primaryField">The primary field from the database.</param>
/// <param name="identityField">The identity field from the database.</param>
/// <returns>A sql statement for insert operation.</returns>
public string CreateInsertAll(QueryBuilder queryBuilder,
string tableName,
IEnumerable <Field> fields = null,
int batchSize = Constant.DefaultBatchOperationSize,
DbField primaryField = null,
DbField identityField = null)
{
// Ensure with guards
GuardTableName(tableName);
GuardPrimary(primaryField);
GuardIdentity(identityField);
// Verify the fields
if (fields?.Any() != true)
{
throw new NullReferenceException($"The list of fields cannot be null or empty.");
}
// Ensure the primary is on the list if it is not an identity
if (primaryField != null)
{
if (primaryField != identityField)
{
var isPresent = fields.FirstOrDefault(f => f.Name.ToLower() == primaryField.Name.ToLower()) != null;
if (isPresent == false)
{
throw new InvalidOperationException("The non-identity primary field must be present during insert operation.");
}
}
}
// Variables needed
var databaseType = (string)null;
var insertableFields = fields
.Where(f => f.Name.ToLower() != identityField?.Name.ToLower());
// Check for the identity
if (identityField != null)
{
var dbType = new ClientTypeToSqlDbTypeResolver().Resolve(identityField.Type);
if (dbType != null)
{
databaseType = new SqlDbTypeToStringNameResolver().Resolve(dbType.Value);
}
}
// Build the query
(queryBuilder ?? new QueryBuilder())
.Clear();
// Iterate the indexes
for (var index = 0; index < batchSize; index++)
{
queryBuilder.Insert()
.Into()
.TableNameFrom(tableName)
.OpenParen()
.FieldsFrom(insertableFields)
.CloseParen()
.Values()
.OpenParen()
.ParametersFrom(insertableFields, index)
.CloseParen()
.End();
// Set the return field
if (identityField != null)
{
var returnValue = string.Concat(identityField.UnquotedName.AsParameter(index), " = ",
string.IsNullOrEmpty(databaseType) ?
"SCOPE_IDENTITY()" :
"CONVERT(", databaseType, ", SCOPE_IDENTITY())");
queryBuilder
.Set()
.WriteText(returnValue)
.End();
}
}
// Return the query
return(queryBuilder.GetString());
}
