private async Task <string> GetTableHasRowsQueryAsyncCore(Identifier tableName)
{
var quotedTableName = Dialect.QuoteName(Identifier.CreateQualifiedIdentifier(tableName.Schema, tableName.LocalName));
var filterSql = "select 1 as dummy_col from " + quotedTableName;
var sql = $"select case when exists ({ filterSql }) then 1 else 0 end as dummy";
var suffix = await _fromQuerySuffixAsync.ConfigureAwait(false);
return(suffix.IsNullOrWhiteSpace()
? sql
: sql + " from " + suffix);
}
/// <summary>
/// Initializes a new instance of the <see cref="T:Ceen.Database.ColumnMapping"/> class.
/// </summary>
/// <param name="dialect">The database dialect.</param>
/// <param name="member">The member to map.</param>
/// <param name="memberType">The member type</param>
private ColumnMapping(IDatabaseDialect dialect, MemberInfo member, Type memberType)
{
Member = member ?? throw new ArgumentNullException(nameof(member));
MemberType = memberType;
ColumnName = dialect.GetName(member);
QuotedColumnName = dialect.QuoteName(ColumnName);
IsPrimaryKey = member.GetCustomAttributes <PrimaryKeyAttribute>(true).Any();
var sqlType = dialect.GetSqlColumnType(member);
SqlType = sqlType.Item1;
AutoGenerateAction = sqlType.Item2;
ValidationRules = member.GetCustomAttributes <ValidationBaseAttribute>(true).ToArray();
}
public static Task <ulong> GetRowCountAsync(this IDbConnectionFactory connection, IDatabaseDialect dialect, Identifier tableName, CancellationToken cancellationToken)
{
if (connection == null)
{
throw new ArgumentNullException(nameof(connection));
}
if (dialect == null)
{
throw new ArgumentNullException(nameof(dialect));
}
if (tableName == null)
{
throw new ArgumentNullException(nameof(tableName));
}
var name = Identifier.CreateQualifiedIdentifier(tableName.Schema, tableName.LocalName);
var quotedName = dialect.QuoteName(name);
var query = "SELECT COUNT(*) FROM " + quotedName;
return(connection.ExecuteScalarAsync <ulong>(query, cancellationToken));
}
/// <summary>
/// Returns the column name in quotes
/// </summary>
/// <param name="propertyname">The name of the property to get the column name for</param>
/// <returns>The quoted column name</returns>
public string QuotedColumnName(string propertyname)
{
return(Dialect.QuoteName(AllColumnsByMemberName[propertyname].ColumnName));
}
/// <summary>
/// Initializes a new instance of the <see cref="T:Ceen.Database.TableMapping"/> class.
/// </summary>
/// <param name="dialect">The database dialect.</param>
/// <param name="type">The type to mape.</param>
/// <param name="nameoverride">An optional name override for the table name</param>
/// <param name="ignorefields">An optional flag that removes all fields from the map</param>
public TableMapping(IDatabaseDialect dialect, Type type, string nameoverride = null, bool ignoreFields = false)
{
Dialect = dialect ?? throw new ArgumentNullException(nameof(dialect));
Type = type;
Name = nameoverride ?? dialect.GetName(type);
QuotedTableName = dialect.QuoteName(Name);
AllColumns = type
.GetProperties()
.Where(x => !x.GetCustomAttributes <IgnoreAttribute>(true).Any())
.Select(x => new ColumnMapping(dialect, x))
.Concat(
type
.GetFields()
.Where(x => !x.GetCustomAttributes <IgnoreAttribute>(true).Any() && !ignoreFields)
.Select(x => new ColumnMapping(dialect, x))
)
.ToArray();
var dbcreated = new[] { AutoGenerateAction.DatabaseAutoID, AutoGenerateAction.DatabaseChangeTimestamp, AutoGenerateAction.DatabaseCreateTimestamp };
InsertColumns = AllColumns.Where(x => !dbcreated.Contains(x.AutoGenerateAction)).ToArray();
ColumnsWithoutPrimaryKey = AllColumns.Where(x => !x.IsPrimaryKey).ToArray();
UpdateColumns = ColumnsWithoutPrimaryKey.Where(x => !dbcreated.Contains(x.AutoGenerateAction)).ToArray();
PrimaryKeys = AllColumns.Where(x => x.IsPrimaryKey).ToArray();
AllColumnsBySqlName = AllColumns.ToDictionary(x => x.ColumnName, x => x);
AllColumnsByMemberName = AllColumns.ToDictionary(x => x.Member.Name, x => x);
// Build the unique maps
var uniques = AllColumns
.Select(x => new Tuple <ColumnMapping, string[]>(x, x.Member.GetCustomAttributes <UniqueAttribute>().Select(y => y.Group).ToArray()))
.Where(x => x.Item2 != null && x.Item2.Length > 0);
var solos = uniques.Where(x => x.Item2.Contains(null));
var groups = uniques
.SelectMany(x =>
x.Item2
.Where(y => y != null)
.Select(y => new KeyValuePair <string, ColumnMapping>(y, x.Item1))
)
.GroupBy(x => x.Key);
Uniques =
solos
.Select(x => new UniqueMapping(null, new ColumnMapping[] { x.Item1 }))
.Concat(
groups.Select(x => new UniqueMapping(x.Key, x.Select(y => y.Value).ToArray()))
).ToArray();
ClientGenerated = new HashSet <ColumnMapping>(AllColumns
.Where(x =>
x.AutoGenerateAction == AutoGenerateAction.ClientGenerateGuid ||
x.AutoGenerateAction == AutoGenerateAction.ClientChangeTimestamp ||
x.AutoGenerateAction == AutoGenerateAction.ClientCreateTimestamp
)
);
DatabaseGenerated = new HashSet <ColumnMapping>(AllColumns
.Where(x =>
x.AutoGenerateAction == AutoGenerateAction.DatabaseAutoID ||
x.AutoGenerateAction == AutoGenerateAction.DatabaseChangeTimestamp ||
x.AutoGenerateAction == AutoGenerateAction.DatabaseCreateTimestamp
)
);
IsPrimaryKeyAutogenerated = PrimaryKeys.Any(x => x.AutoGenerateAction == AutoGenerateAction.DatabaseAutoID);
HasDatabaseGeneratedCreateTimestamp = ColumnsWithoutPrimaryKey.Any(x => x.AutoGenerateAction == AutoGenerateAction.DatabaseCreateTimestamp);
HasDatabaseGeneratedChangeTimestamp = ColumnsWithoutPrimaryKey.Any(x => x.AutoGenerateAction == AutoGenerateAction.DatabaseChangeTimestamp);
ValidationRules = type.GetCustomAttributes <ValidationBaseAttribute>(true).ToArray();
AllColumnsWithValidationRules = AllColumns.Where(x => x.ValidationRules.Length > 0).ToArray();
HasValidationRules = ValidationRules.Length + AllColumnsWithValidationRules.Length > 0;
}
