private void _alterColumn(APDatabase db, APGenTable table, APGenColumn column, columninfo info)
{
DbCommand dbCmd;
int totalCount, nullCount = 0;
dbCmd = db.CreateSqlCommand("select count(*) from {0}", table.TableName, column.ColumnName);
totalCount = Convert.ToInt32(dbCmd.ExecuteScalar());
if (totalCount > 0)
{
dbCmd = db.CreateSqlCommand("select count(*) from {0} where {1} is null", table.TableName, column.ColumnName);
nullCount = Convert.ToInt32(dbCmd.ExecuteScalar());
}
if (totalCount > 0)
{
if (!_sameType(DBTypeName(column), info.GetTypeFullName()) && nullCount != totalCount)
{
// change db type, the column value must be null
if (!info.isnullable)
{
dbCmd = db.CreateSqlCommand("alter table {0} modify {1} null",
table.TableName, column.ColumnName);
dbCmd.ExecuteNonQuery();
info.isnullable = true;
}
_tempSql(String.Format("update {0} set {1} = null where {1} is not null", table.TableName, column.ColumnName));
nullCount = totalCount;
}
}
string sqlPadding = "";
if (DBTypeName(column) != info.GetTypeFullName())
{
sqlPadding += " " + DBTypeName(column);
}
if (column.DBDefaultValue != info.dfvalue)
{
sqlPadding += " " + DF_constraint(table, column);
}
bool lazyNotNullable = false;
if (column.IsNullable != info.isnullable)
{
if (column.IsNullable || nullCount == 0)
{
sqlPadding += " " + IsNullableString(column);
}
else
{
lazyNotNullable = true;
}
}
if (sqlPadding != "")
{
dbCmd = db.CreateSqlCommand("alter table {0} modify {1}", table.TableName, column.ColumnName);
dbCmd.CommandText += sqlPadding;
dbCmd.ExecuteNonQuery();
}
if (lazyNotNullable)
{
string dfv = column.DBDefaultValue;
if (dfv == "")
{
dfv = "0";
}
_tempSql(String.Format("update {0} set {1} = {2} where {1} is null", table.TableName, column.ColumnName, dfv));
dbCmd = db.CreateSqlCommand("alter table {0} modify {1} not null", table.TableName, column.ColumnName);
dbCmd.ExecuteNonQuery();
}
// alter table table_nae modify column_name type_name default dfvalue [not] null
// go
}
private void ModifyTable(APDatabase db, APGenTable table)
{
Dictionary <string, columninfo> dbColumns = _getColumns(db, table);
Dictionary <string, indexinfo> dbIndexes = _getIndexes(db, table);
bool isTableEmpty = _isTableEmpty(db, table);
// analysis columns
List <APGenColumn> listCreateColumn = new List <APGenColumn>();
List <APGenColumn> listModifyColumn = new List <APGenColumn>();
Dictionary <string, columninfo> deleteColumns = new Dictionary <string, columninfo>(dbColumns, StringComparer.InvariantCultureIgnoreCase);
foreach (APGenColumn column in table.Columns)
{
_setScanColumn(column.ColumnName);
string colname = column.ColumnName;
if (!dbColumns.ContainsKey(colname))
{
// db has not this column, wait for create.
listCreateColumn.Add(column);
}
else
{
deleteColumns.Remove(colname);
columninfo colinfo = dbColumns[colname];
if (column.IsNullable != colinfo.isnullable ||
column.DBDefaultValue != colinfo.dfvalue ||
DBTypeName(column) != colinfo.GetTypeFullName()
// no safe mode to change identity, so ingone change this
// || (column.IdentityType == APColumnIdentityType.Database ^ colinfo.is_identity)
)
{
listModifyColumn.Add(column);
}
}
}
// analysis indexes
List <APGenIndex> listCreateIndex = new List <APGenIndex>();
foreach (APGenIndex index in table.Indexes)
{
string ix_name = index.Name;
if (!dbIndexes.ContainsKey(ix_name))
{
// db has not this index, wait for create.
listCreateIndex.Add(index);
}
else
{
// db has this index and columns according fitted, then to nothing.
// elsewise, wait fo modify this index.
// drop in db indexes residual in dbIndexes.
indexinfo info = dbIndexes[ix_name];
string ix_keys = IndKeys(table, index, false);
if (info.indkeys.Equals(ix_keys, StringComparison.InvariantCultureIgnoreCase))
{
bool maybe = false;
foreach (APGenColumn column in listModifyColumn)
{
if (info.columns.ContainsKey(column.ColumnName))
{
listCreateIndex.Add(index);
maybe = true;
break;
}
}
if (!maybe)
{
dbIndexes.Remove(ix_name);
}
}
else
{
listCreateIndex.Add(index);
}
}
}
// analysis uniques
List <APGenIndex> listCreateUnique = new List <APGenIndex>();
foreach (APGenIndex index in table.Uniques)
{
string ix_name = index.Name;
if (!dbIndexes.ContainsKey(ix_name))
{
// db has not this unique, wait for create.
listCreateUnique.Add(index);
}
else
{
// db has this unique, then to nothing.
// elsewise, wait fo modify this unique.
// drop in db uniques residual in dbIndexes.
indexinfo info = dbIndexes[ix_name];
string uq_keys = IndKeys(table, index, true);
if (info.indkeys.Equals(uq_keys, StringComparison.InvariantCultureIgnoreCase))
{
bool maybe = false;
foreach (APGenColumn column in listModifyColumn)
{
if (info.columns.ContainsKey(column.ColumnName))
{
listCreateUnique.Add(index);
maybe = true;
break;
}
}
if (!maybe)
{
dbIndexes.Remove(ix_name);
}
}
else
{
listCreateUnique.Add(index);
}
}
}
// 1. dbIndexes for 'drop', but PK_ index analysis columns.
// 2. listCreateIndex for 'create'.
// 2. listCreateUnique for 'create'.
// process
string pkKeys = "";
foreach (APGenColumn column in table.PrimaryKeyColumns)
{
if (pkKeys != "")
{
pkKeys += ",";
}
pkKeys += column.ColumnName;
}
// 1. drop indexes
bool needAddPrimary = true;
foreach (indexinfo info in dbIndexes.Values)
{
if (info.indtype == indexType.Primary && info.indkeys.Equals(pkKeys, StringComparison.InvariantCultureIgnoreCase))
{
needAddPrimary = false;
}
else
{
_dropIndex(db, table, info);
}
}
// 2. drop columns
foreach (columninfo info in deleteColumns.Values)
{
_dropColumn(db, table, info);
}
// 3. modify columns
foreach (APGenColumn column in listModifyColumn)
{
_alterColumn(db, table, column, dbColumns[column.ColumnName]);
}
// 4. create columns
foreach (APGenColumn column in listCreateColumn)
{
_createColumn(db, table, column, isTableEmpty);
}
// 5. mayby primary key
if (needAddPrimary)
{
_createPrimaryKey(db, table);
}
// 6. create indexes
foreach (APGenIndex index in listCreateIndex)
{
_createIndex(db, table, index);
}
// 7. create unique
foreach (APGenIndex unique in listCreateUnique)
{
_createUnique(db, table, unique);
}
}
private void _alterColumn(APDatabase db, APGenTable table, APGenColumn column, columninfo info)
{
DbCommand dbCmd;
int totalCount, nullCount = 0;
dbCmd = db.CreateSqlCommand("select count(*) from {0}", table.TableName, column.ColumnName);
totalCount = Convert.ToInt32(dbCmd.ExecuteScalar());
if (totalCount > 0)
{
dbCmd = db.CreateSqlCommand("select count(*) from {0} where {1} is null", table.TableName, column.ColumnName);
nullCount = Convert.ToInt32(dbCmd.ExecuteScalar());
}
if (totalCount > 0)
{
if (!_sameType(DBTypeName(column), info.GetTypeFullName()) && nullCount != totalCount)
{
// change db type, the column value must be null
if (!info.isnullable)
{
dbCmd = db.CreateSqlCommand("alter table {0} modify {1} null",
table.TableName, column.ColumnName);
dbCmd.ExecuteNonQuery();
info.isnullable = true;
}
_tempSql(String.Format("update {0} set {1} = null where {1} is not null", table.TableName, column.ColumnName));
nullCount = totalCount;
}
}
string sqlPadding = "";
if (DBTypeName(column) != info.GetTypeFullName())
sqlPadding += " " + DBTypeName(column);
if (column.DBDefaultValue != info.dfvalue)
sqlPadding += " " + DF_constraint(table, column);
bool lazyNotNullable = false;
if (column.IsNullable != info.isnullable)
{
if (column.IsNullable || nullCount == 0)
sqlPadding += " " + IsNullableString(column);
else
lazyNotNullable = true;
}
if (sqlPadding != "")
{
dbCmd = db.CreateSqlCommand("alter table {0} modify {1}", table.TableName, column.ColumnName);
dbCmd.CommandText += sqlPadding;
dbCmd.ExecuteNonQuery();
}
if (lazyNotNullable)
{
string dfv = column.DBDefaultValue;
if (dfv == "")
dfv = "0";
_tempSql(String.Format("update {0} set {1} = {2} where {1} is null", table.TableName, column.ColumnName, dfv));
dbCmd = db.CreateSqlCommand("alter table {0} modify {1} not null", table.TableName, column.ColumnName);
dbCmd.ExecuteNonQuery();
}
// alter table table_nae modify column_name type_name default dfvalue [not] null
// go
}