package liquibase.sqlgenerator.core;
import liquibase.database.Database;
import liquibase.database.core.*;
import liquibase.datatype.DataTypeFactory;
import liquibase.exception.DatabaseException;
import liquibase.exception.ValidationErrors;
import liquibase.sql.Sql;
import liquibase.sql.UnparsedSql;
import liquibase.sqlgenerator.SqlGeneratorChain;
import liquibase.sqlgenerator.SqlGeneratorFactory;
import liquibase.statement.core.SetNullableStatement;
import liquibase.statement.core.ReorganizeTableStatement;
import liquibase.structure.core.Column;
import liquibase.structure.core.Table;
import java.util.ArrayList;
import java.util.List;
import java.util.Arrays;
public class SetNullableGenerator extends AbstractSqlGenerator<SetNullableStatement> {
@Override
public boolean supports(SetNullableStatement statement, Database database) {
return !(database instanceof FirebirdDatabase ||
database instanceof SQLiteDatabase);
}
@Override
public ValidationErrors validate(SetNullableStatement setNullableStatement, Database database, SqlGeneratorChain sqlGeneratorChain) {
ValidationErrors validationErrors = new ValidationErrors();
validationErrors.checkRequiredField("tableName", setNullableStatement.getTableName());
validationErrors.checkRequiredField("columnName", setNullableStatement.getColumnName());
if (database instanceof MSSQLDatabase || database instanceof MySQLDatabase || database instanceof InformixDatabase || database instanceof H2Database) {
validationErrors.checkRequiredField("columnDataType", setNullableStatement.getColumnDataType());
}
try {
if ((database instanceof DB2Database) && (database.getDatabaseMajorVersion() > 0 && database.getDatabaseMajorVersion() < 9)) {
validationErrors.addError("DB2 versions less than 9 do not support modifying null constraints");
}
} catch (DatabaseException ignore) {
//cannot check
}
return validationErrors;
}
@Override
public Sql[] generateSql(SetNullableStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain) {
String sql;
String nullableString;
if (statement.isNullable()) {
nullableString = " NULL";
} else {
nullableString = " NOT NULL";
}
if (database instanceof OracleDatabase || database instanceof SybaseDatabase || database instanceof SybaseASADatabase) {
sql = "ALTER TABLE " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + " MODIFY " + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getColumnName()) + nullableString;
} else if (database instanceof MSSQLDatabase) {
sql = "ALTER TABLE " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + " ALTER COLUMN " + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getColumnName()) + " " + DataTypeFactory.getInstance().fromDescription(statement.getColumnDataType(), database).toDatabaseDataType(database) + nullableString;
} else if (database instanceof MySQLDatabase) {
sql = "ALTER TABLE " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + " MODIFY " + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getColumnName()) + " " + DataTypeFactory.getInstance().fromDescription(statement.getColumnDataType(), database).toDatabaseDataType(database) + nullableString;
} else if (database instanceof DerbyDatabase) {
sql = "ALTER TABLE " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + " ALTER COLUMN " + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getColumnName()) + nullableString;
} else if (database instanceof HsqlDatabase || database instanceof H2Database) {
sql = "ALTER TABLE " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + " ALTER COLUMN " + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getColumnName()) + " SET"+nullableString;
} else if (database instanceof InformixDatabase) {
// Informix simply omits the null for nullables
if (statement.isNullable()) {
nullableString = "";
}
sql = "ALTER TABLE " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + " MODIFY (" + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getColumnName()) + " " + DataTypeFactory.getInstance().fromDescription(statement.getColumnDataType(), database).toDatabaseDataType(database) + nullableString + ")";
} else {
sql = "ALTER TABLE " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + " ALTER COLUMN " + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getColumnName()) + (statement.isNullable() ? " DROP NOT NULL" : " SET NOT NULL");
}
List<Sql> returnList = new ArrayList<Sql>();
returnList.add(new UnparsedSql(sql, getAffectedColumn(statement)));
if (database instanceof DB2Database) {
Sql[] a = SqlGeneratorFactory.getInstance().generateSql(new ReorganizeTableStatement(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()), database);
if (a != null) {
returnList.addAll(Arrays.asList(a));
}
}
return returnList.toArray(new Sql[returnList.size()]);
}
protected Column getAffectedColumn(SetNullableStatement statement) {
return new Column().setName(statement.getColumnName()).setRelation(new Table().setName(statement.getTableName()).setSchema(statement.getCatalogName(), statement.getSchemaName()));
}
}