/// <summary>
///
/// </summary>
/// <param name="tableName"></param>
/// <param name="tempTableName"></param>
/// <param name="fields"></param>
/// <param name="qualifiers"></param>
/// <param name="primaryField"></param>
/// <param name="identityField"></param>
/// <param name="hints"></param>
/// <param name="dbSetting"></param>
/// <param name="isReturnIdentity"></param>
/// <returns></returns>
private static string GetBulkMergeSqlText(string tableName,
string tempTableName,
IEnumerable <Field> fields,
IEnumerable <Field> qualifiers,
Field primaryField,
Field identityField,
string hints,
IDbSetting dbSetting,
bool isReturnIdentity)
{
// Validate the presence
if (fields?.Any() != true)
{
throw new MissingFieldException("There are no field(s) defined.");
}
if (qualifiers?.Any() != true)
{
throw new MissingFieldException("There is no qualifier field(s) defined.");
}
// Variables needed
var builder = new QueryBuilder();
// Insertable fields
var insertableFields = fields
.Where(field => string.Equals(field.Name, identityField?.Name, StringComparison.OrdinalIgnoreCase) == false);
// Updatable fields
var updateableFields = fields
.Where(field => field != identityField && field != primaryField)
.Where(field =>
qualifiers.Any(
q => string.Equals(q.Name, field.Name, StringComparison.OrdinalIgnoreCase)) == false);
// Compose the statement
builder.Clear()
// MERGE T USING S
.Merge()
.TableNameFrom(tableName, dbSetting)
.HintsFrom(hints)
.As("T")
.Using()
.OpenParen()
.Select()
.Top()
.WriteText("100 PERCENT")
//.FieldsFrom(fields, dbSetting)
.WriteText("*") // Including the [__RepoDb_OrderColumn]
.From()
.TableNameFrom(tempTableName, dbSetting);
// Return Identity
if (isReturnIdentity && identityField != null)
{
builder
.OrderBy()
.WriteText("[__RepoDb_OrderColumn]")
.Ascending();
}
// Continuation
builder
.CloseParen()
.As("S")
// QUALIFIERS
.On()
.OpenParen()
.WriteText(qualifiers
.Select(
field => field.AsJoinQualifier("S", "T", dbSetting))
.Join(" AND "))
.CloseParen()
// WHEN NOT MATCHED THEN INSERT VALUES
.When()
.Not()
.Matched()
.Then()
.Insert()
.OpenParen()
.FieldsFrom(insertableFields, dbSetting)
.CloseParen()
.Values()
.OpenParen()
.AsAliasFieldsFrom(insertableFields, "S", dbSetting)
.CloseParen()
// WHEN MATCHED THEN UPDATE SET
.When()
.Matched()
.Then()
.Update()
.Set()
.FieldsAndAliasFieldsFrom(updateableFields, "T", "S", dbSetting);
// Set the output
if (isReturnIdentity == true && identityField != null)
{
builder
.WriteText(string.Concat("OUTPUT INSERTED.", identityField.Name.AsField(dbSetting)))
.As("[Result],")
.WriteText("S.[__RepoDb_OrderColumn]")
.As("[OrderColumn]");
}
// End the builder
builder.End();
// Return the sql
return(builder.ToString());
}
/// <summary>
/// Creates a SQL Statement for merge-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 merged.</param>
/// <param name="qualifiers">The list of the qualifier <see cref="Field"/> objects.</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 merge operation.</returns>
public string CreateMergeAll(QueryBuilder queryBuilder,
string tableName,
IEnumerable <Field> fields,
IEnumerable <Field> qualifiers = 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($"The list of fields cannot be null or empty.");
}
// Check the qualifiers
if (qualifiers?.Any() == true)
{
// Check if the qualifiers are present in the given fields
var unmatchesQualifiers = qualifiers.Where(field =>
fields.FirstOrDefault(f =>
field.UnquotedName.ToLower() == f.UnquotedName.ToLower()) == null);
// Throw an error we found any unmatches
if (unmatchesQualifiers?.Any() == true)
{
throw new InvalidQualifierFieldsException($"The qualifiers '{unmatchesQualifiers.Select(field => field.Name).Join(", ")}' are not " +
$"present at the given fields '{fields.Select(field => field.Name).Join(", ")}'.");
}
}
else
{
if (primaryField != null)
{
// Make sure that primary is present in the list of fields before qualifying to become a qualifier
var isPresent = fields?.FirstOrDefault(f => f.Name.ToLower() == primaryField.Name.ToLower()) != null;
// Throw if not present
if (isPresent == false)
{
throw new InvalidQualifierFieldsException($"There are no qualifier field objects found for '{tableName}'. Ensure that the " +
$"primary field is present at the given fields '{fields.Select(field => field.Name).Join(", ")}'.");
}
// The primary is present, use it as a default if there are no qualifiers given
qualifiers = primaryField.AsField().AsEnumerable();
}
else
{
// Throw exception, qualifiers are not defined
throw new NullReferenceException($"There are no qualifier field objects found for '{tableName}'.");
}
}
// Get the insertable and updateable fields
var insertableFields = fields
.Where(field => field.Name.ToLower() != identityField?.Name.ToLower());
var updateableFields = fields
.Where(field => field.Name.ToLower() != primaryField?.Name.ToLower() && field.Name.ToLower() != identityField?.Name.ToLower());
// Variables needed
var databaseType = (string)null;
// Check for the identity
if (identityField != null)
{
var dbType = new ClientTypeToSqlDbTypeResolver().Resolve(identityField.Type);
if (dbType != null)
{
databaseType = new SqlDbTypeToStringNameResolver().Resolve(dbType.Value);
}
}
else if (primaryField != null)
{
var dbType = new ClientTypeToSqlDbTypeResolver().Resolve(primaryField.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++)
{
// MERGE T USING S
queryBuilder.Merge()
.TableNameFrom(tableName)
.As("T")
.Using()
.OpenParen()
.Select()
.ParametersAsFieldsFrom(fields, index)
.CloseParen()
.As("S")
// QUALIFIERS
.On()
.OpenParen()
.WriteText(qualifiers?
.Select(
field => field.AsJoinQualifier("S", "T"))
.Join(" AND "))
.CloseParen()
// WHEN NOT MATCHED THEN INSERT VALUES
.When()
.Not()
.Matched()
.Then()
.Insert()
.OpenParen()
.FieldsFrom(insertableFields)
.CloseParen()
.Values()
.OpenParen()
.AsAliasFieldsFrom(insertableFields, "S")
.CloseParen()
// WHEN MATCHED THEN UPDATE SET
.When()
.Matched()
.Then()
.Update()
.Set()
.FieldsAndAliasFieldsFrom(updateableFields, "S");
// Set the output
var outputField = identityField ?? primaryField;
if (outputField != null)
{
queryBuilder
.WriteText(string.Concat("OUTPUT INSERTED.", outputField.Name))
.As("[Result]");
}
// End the builder
queryBuilder.End();
}
// Return the query
return(queryBuilder.GetString());
}
