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using System.Data;
using System.Text;
using System.Text.RegularExpressions;
using Dapper;
namespace CrupestApi.Commons.Crud.Migrations;
public class SqliteDatabaseMigrator : IDatabaseMigrator
{
private void CheckTableName(string name)
{
if (Regex.Match(name, @"^[_0-9a-zA-Z]+$").Success is false)
{
throw new ArgumentException("Fxxk, what have you passed as table name.");
}
}
public Table GetTable(IDbConnection dbConnection, string name)
{
CheckTableName(name);
var table = new Table(name);
var queryColumns = dbConnection.Query<dynamic>($"PRAGMA table_info({name})");
foreach (var column in queryColumns)
{
var columnName = (string)column.name;
var columnType = (string)column.type;
var isNullable = (bool)column.notnull;
var primaryKey = (long)column.pk;
table.Columns.Add(new TableColumn(columnName, columnType, isNullable, (int)primaryKey));
}
return table;
}
public Table ConvertTableInfoToTable(TableInfo tableInfo)
{
var table = new Table(tableInfo.TableName);
foreach (var columnInfo in tableInfo.Columns)
{
table.Columns.Add(new TableColumn(columnInfo.ColumnName, columnInfo.ColumnType.GetSqlTypeString(),
!columnInfo.IsNotNull, columnInfo.IsPrimaryKey ? 1 : 0));
}
return table;
}
public bool CanAutoMigrate(IDbConnection dbConnection, TableInfo tableInfo)
{
if (!TableExists(dbConnection, tableInfo.TableName)) return true;
var databaseTable = GetTable(dbConnection, tableInfo.TableName);
var wantedTable = ConvertTableInfoToTable(tableInfo);
var databaseTableColumns = new HashSet<TableColumn>(databaseTable.Columns);
var wantedTableColumns = new HashSet<TableColumn>(wantedTable.Columns);
if (databaseTableColumns.IsSubsetOf(wantedTableColumns))
{
var addColumns = wantedTableColumns.Except(databaseTableColumns);
foreach (var column in addColumns)
{
if (tableInfo.GetColumn(column.Name) is not null)
{
var columnInfo = tableInfo.GetColumn(column.Name);
if (!columnInfo.CanBeGenerated)
{
return false;
}
}
}
return true;
}
else
{
return false;
}
}
public string GenerateCreateTableSql(string tableName, IEnumerable<TableColumn> columns)
{
CheckTableName(tableName);
var columnSql = string.Join(",\n", columns.Select(GenerateCreateTableColumnSqlSegment));
var sql = $@"
CREATE TABLE {tableName}(
{columnSql}
);
";
return sql;
}
public void AutoMigrate(IDbConnection dbConnection, TableInfo tableInfo)
{
if (!CanAutoMigrate(dbConnection, tableInfo))
{
throw new Exception("The table can't be auto migrated.");
}
// We are sqlite, so it's a little bit difficult.
using var transaction = dbConnection.BeginTransaction();
var tableName = tableInfo.TableName;
var wantedTable = ConvertTableInfoToTable(tableInfo);
var wantedTableColumns = new HashSet<TableColumn>(wantedTable.Columns);
var exist = TableExists(dbConnection, tableName);
if (exist)
{
var databaseTable = GetTable(dbConnection, tableName);
var databaseTableColumns = new HashSet<TableColumn>(databaseTable.Columns);
var addColumns = wantedTableColumns.Except(databaseTableColumns);
var tempTableName = tableInfo.TableName + "_temp";
dbConnection.Execute($"ALTER TABLE {tableName} RENAME TO {tempTableName}", new { TableName = tableName, tempTableName });
var createTableSql = GenerateCreateTableSql(tableName, wantedTableColumns.ToList());
dbConnection.Execute(createTableSql);
// Copy old data to new table.
var originalRows = dbConnection.Query<dynamic>($"SELECT * FROM {tempTableName}").Cast<IDictionary<string, object?>>().ToList();
foreach (var originalRow in originalRows)
{
var parameters = new DynamicParameters();
var originalColumnNames = originalRow.Keys.ToList();
foreach (var columnName in originalColumnNames)
{
parameters.Add(columnName, originalRow[columnName]);
}
var addColumnNames = addColumns.Select(c => c.Name).ToList();
foreach (var columnName in addColumnNames)
{
parameters.Add(columnName, tableInfo.GetColumn(columnName).GenerateDefaultValue());
}
string columnSql = string.Join(", ", wantedTableColumns.Select(c => c.Name));
string valuesSql = string.Join(", ", wantedTableColumns.Select(c => "@" + c.Name));
string sql = $"INSERT INTO {tableName} ({columnSql}) VALUES {valuesSql})";
dbConnection.Execute(sql, parameters);
}
// Finally drop old table
dbConnection.Execute($"DROP TABLE {tempTableName}");
}
else
{
var createTableSql = GenerateCreateTableSql(tableName, wantedTableColumns.ToList());
dbConnection.Execute(createTableSql);
}
// Commit transaction.
transaction.Commit();
}
public string GenerateCreateTableColumnSqlSegment(TableColumn column)
{
StringBuilder result = new StringBuilder();
result.Append(column.Name);
result.Append(' ');
result.Append(column.Type);
if (column.PrimaryKey is not 0)
{
result.Append(" PRIMARY KEY AUTOINCREMENT");
}
else if (!column.IsNullable)
{
result.Append(" NOT NULL");
}
return result.ToString();
}
public bool NeedMigrate(IDbConnection dbConnection, TableInfo tableInfo)
{
if (!TableExists(dbConnection, tableInfo.TableName)) return true;
var tableName = tableInfo.TableName;
var databaseTable = GetTable(dbConnection, tableName);
var wantedTable = ConvertTableInfoToTable(tableInfo);
var databaseTableColumns = new HashSet<TableColumn>(databaseTable.Columns);
var wantedTableColumns = new HashSet<TableColumn>(wantedTable.Columns);
return databaseTableColumns != wantedTableColumns;
}
public bool TableExists(IDbConnection connection, string tableName)
{
var count = connection.QuerySingle<int>(
"SELECT count(*) FROM sqlite_schema WHERE type = 'table' AND tbl_name = @TableName;",
new { TableName = tableName });
if (count == 0)
{
return false;
}
else if (count > 1)
{
throw new Exception($"More than 1 table has name {tableName}. What happened?");
}
else
{
return true;
}
}
}
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