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using System.Data;
using System.Text;
using System.Text.Json;
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]+$").Success is false)
{
throw new ArgumentException("Fxxk, what have you passed as table name.");
}
}
private const string MigrationHistoryTableName = "migration_history";
private class MigrationRecordEntity
{
public string TableName { get; set; } = string.Empty;
public int Version { get; set; }
public string Structure { get; set; } = string.Empty;
}
private void EnsureHistoryDatabase(IDbConnection dbConnection)
{
var exist = dbConnection.Query<int>($"SELECT count(*) FROM sqlite_master WHERE type='table' AND name='{MigrationHistoryTableName}';").Single() == 1;
if (!exist)
{
dbConnection.Execute($@"
CREATE TABLE {MigrationHistoryTableName} (
Id INTEGER PRIMARY KEY AUTOINCREMENT,
TableName TEXT NOT NULL,
Version INT NOT NULL,
Structure TEXT NOT NULL
);
");
}
}
public List<MigrationRecord> GetRecords(IDbConnection dbConnection, string tableName)
{
CheckTableName(tableName);
EnsureHistoryDatabase(dbConnection);
var recordEntities = dbConnection.Query<MigrationRecordEntity>(
$"SELECT * FROM {MigrationHistoryTableName} WHERE TableName = @TableName ORDER BY Version ASC;",
new { TableName = tableName }
).ToList();
var records = recordEntities.Select(entity =>
{
var structure = JsonSerializer.Deserialize<Table>(entity.Structure);
if (structure is null) throw new Exception("Migration record is corrupted. Failed to convert structure.");
return new MigrationRecord
{
TableName = entity.TableName,
Version = entity.Version,
Structure = structure
};
}).ToList();
return records;
}
public Table? GetTable(IDbConnection dbConnection, string tableName)
{
CheckTableName(tableName);
var count = dbConnection.QuerySingle<int>(
"SELECT count(*) FROM sqlite_schema WHERE type = 'table' AND name = @TableName;",
new { TableName = tableName });
if (count == 0)
{
return null;
}
else if (count > 1)
{
throw new Exception($"More than 1 table has name {tableName}. What happened?");
}
else
{
var table = new Table(tableName);
var queryColumns = dbConnection.Query<dynamic>($"PRAGMA table_info({tableName})");
foreach (var column in queryColumns)
{
var columnName = (string)column.name;
var columnType = (string)column.type;
var isNullable = Convert.ToBoolean(column.notnull);
var primaryKey = Convert.ToInt32(column.pk);
table.Columns.Add(new TableColumn(columnName, columnType, isNullable, 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 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.NotNull)
{
result.Append(" NOT NULL");
}
return result.ToString();
}
public string GenerateCreateTableSql(string tableName, IEnumerable<TableColumn> columns)
{
CheckTableName(tableName);
var sql = $@"
CREATE TABLE {tableName} (
{string.Join(",\n ", columns.Select(GenerateCreateTableColumnSqlSegment))}
);
".Trim();
return sql;
}
public void AutoMigrate(IDbConnection dbConnection, TableInfo tableInfo)
{
var tableName = tableInfo.TableName;
var databaseTable = GetTable(dbConnection, tableName);
var wantedTable = ConvertTableInfoToTable(tableInfo);
var databaseTableColumnNames = databaseTable is null ? new List<string>() : databaseTable.Columns.Select(column => column.Name).ToList();
var wantedTableColumnNames = wantedTable.Columns.Select(column => column.Name).ToList();
var notChangeColumns = wantedTableColumnNames.Where(column => databaseTableColumnNames.Contains(column)).ToList();
var addColumns = wantedTableColumnNames.Where(column => !databaseTableColumnNames.Contains(column)).ToList();
if (databaseTable is not null && dbConnection.QuerySingle<int>($"SELECT count(*) FROM {tableName}") > 0)
{
foreach (var columnName in addColumns)
{
var columnInfo = tableInfo.GetColumn(columnName);
if (!columnInfo.CanBeGenerated)
{
throw new Exception($"Column {columnName} cannot be generated. So we can't auto-migrate.");
}
}
}
// We are sqlite, so it's a little bit difficult.
using var transaction = dbConnection.BeginTransaction();
if (databaseTable is not null)
{
var tempTableName = tableInfo.TableName + "_temp";
dbConnection.Execute($"ALTER TABLE {tableName} RENAME TO {tempTableName}", new { TableName = tableName, tempTableName });
var createTableSql = GenerateCreateTableSql(tableName, wantedTable.Columns);
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();
foreach (var columnName in notChangeColumns)
{
parameters.Add(columnName, originalRow[columnName]);
}
foreach (var columnName in addColumns)
{
parameters.Add(columnName, tableInfo.GetColumn(columnName).GenerateDefaultValue());
}
string columnSql = string.Join(", ", wantedTableColumnNames);
string valuesSql = string.Join(", ", wantedTableColumnNames.Select(c => "@" + c));
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, wantedTable.Columns);
dbConnection.Execute(createTableSql);
}
// Commit transaction.
transaction.Commit();
}
public bool NeedMigrate(IDbConnection dbConnection, TableInfo tableInfo)
{
var tableName = tableInfo.TableName;
var databaseTable = GetTable(dbConnection, tableName);
var wantedTable = ConvertTableInfoToTable(tableInfo);
var databaseTableColumns = databaseTable is null ? new HashSet<string>() : new HashSet<string>(databaseTable.Columns.Select(c => c.Name));
var wantedTableColumns = new HashSet<string>(wantedTable.Columns.Select(c => c.Name));
return !databaseTableColumns.SetEquals(wantedTableColumns);
}
}
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