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namespace CrupestApi.Commons.Crud;
public class TableInfo
{
public TableInfo(Type entityType)
{
EntityType = entityType;
var properties = entityType.GetProperties();
var columnInfos = new List<ColumnInfo>();
bool hasPrimaryKey = false;
bool hasId = false;
foreach (var property in properties)
{
var columnInfo = new ColumnInfo(entityType, property.Name);
columnInfos.Add(columnInfo);
if (columnInfo.IsPrimaryKey)
hasPrimaryKey = true;
if (columnInfo.SqlColumnName.Equals("id", StringComparison.OrdinalIgnoreCase))
{
hasId = true;
}
}
if (!hasPrimaryKey)
{
if (hasId) throw new Exception("A column named id already exists but is not primary key.");
var columnInfo = new ColumnInfo(entityType, "id", true, true, ColumnTypeInfoRegistry.Singleton.GetRequiredByDataType(typeof(int)));
columnInfos.Add(columnInfo);
}
ColumnInfos = columnInfos;
CheckValidity();
}
public Type EntityType { get; }
public IReadOnlyList<ColumnInfo> ColumnInfos { get; }
public void CheckValidity()
{
// Check if there is only one primary key.
bool hasPrimaryKey = false;
foreach (var column in ColumnInfos)
{
if (column.IsPrimaryKey)
{
if (hasPrimaryKey) throw new Exception("Two columns are primary key.");
hasPrimaryKey = true;
}
}
if (!hasPrimaryKey) throw new Exception("No column is primary key.");
// Check two columns have the same sql name.
HashSet<string> sqlNameSet = new HashSet<string>();
foreach (var column in ColumnInfos)
{
if (sqlNameSet.Contains(column.SqlColumnName))
throw new Exception($"Two columns have the same sql name '{column.SqlColumnName}'.");
sqlNameSet.Add(column.SqlColumnName);
}
}
public string GenerateCreateTableSql()
{
throw new NotImplementedException();
}
}
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