package liquibase.sqlgenerator.core;
import liquibase.database.Database;
import liquibase.database.core.*;
import liquibase.datatype.DataTypeFactory;
import liquibase.exception.ValidationErrors;
import liquibase.sql.Sql;
import liquibase.sql.UnparsedSql;
import liquibase.sqlgenerator.SqlGeneratorChain;
import liquibase.statement.core.RenameColumnStatement;
import liquibase.structure.core.Column;
import liquibase.structure.core.Table;
public class RenameColumnGenerator extends AbstractSqlGenerator<RenameColumnStatement> {
@Override
public boolean supports(RenameColumnStatement statement, Database database) {
return !(database instanceof SQLiteDatabase);
}
@Override
public ValidationErrors validate(RenameColumnStatement renameColumnStatement, Database database, SqlGeneratorChain sqlGeneratorChain) {
ValidationErrors validationErrors = new ValidationErrors();
validationErrors.checkRequiredField("tableName", renameColumnStatement.getTableName());
validationErrors.checkRequiredField("oldColumnName", renameColumnStatement.getOldColumnName());
validationErrors.checkRequiredField("newColumnName", renameColumnStatement.getNewColumnName());
if (database instanceof MySQLDatabase) {
validationErrors.checkRequiredField("columnDataType", renameColumnStatement.getColumnDataType());
}
return validationErrors;
}
@Override
public Sql[] generateSql(RenameColumnStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain) {
String sql;
if (database instanceof MSSQLDatabase) {
// do no escape the new column name. Otherwise it produce "exec sp_rename '[dbo].[person].[usernae]', '[username]'"
sql = "exec sp_rename '" + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + "." + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getOldColumnName()) + "', '" + statement.getNewColumnName() + "'";
} else if (database instanceof MySQLDatabase) {
sql ="ALTER TABLE " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + " CHANGE " + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getOldColumnName()) + " " + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getNewColumnName()) + " " + DataTypeFactory.getInstance().fromDescription(statement.getColumnDataType(), database).toDatabaseDataType(database);
} else if (database instanceof SybaseDatabase) {
sql = "exec sp_rename '" + statement.getTableName() + "." + statement.getOldColumnName() + "', '" + statement.getNewColumnName() + "'";
} 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.getOldColumnName()) + " RENAME TO " + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getNewColumnName());
} else if (database instanceof FirebirdDatabase) {
sql = "ALTER TABLE " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + " ALTER COLUMN " + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getOldColumnName()) + " TO " + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getNewColumnName());
} else if (
// supported in Derby from version 10.3.1.4 (see "http://issues.apache.org/jira/browse/DERBY-1490")
(database instanceof DerbyDatabase)
|| (database instanceof InformixDatabase)) {
sql = "RENAME COLUMN " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + "." + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getOldColumnName()) + " TO " + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getNewColumnName());
} else if (database instanceof SybaseASADatabase) {
sql = "ALTER TABLE " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + " RENAME " + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getOldColumnName()) + " TO " + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getNewColumnName());
} else if (database instanceof DB2Database) {
sql = "ALTER TABLE " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + " RENAME COLUMN " + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getOldColumnName()) + " TO " + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getNewColumnName());
} else {
sql = "ALTER TABLE " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + " RENAME COLUMN " + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getOldColumnName()) + " TO " + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getNewColumnName());
}
if( database instanceof MySQLDatabase && statement.getRemarks() != null ) {
sql += " COMMENT '" + statement.getRemarks() +"' ";
}
return new Sql[] {
new UnparsedSql(sql, getAffectedOldColumn(statement), getAffectedNewColumn(statement))
};
}
protected Column getAffectedOldColumn(RenameColumnStatement statement) {
return new Column().setName(statement.getOldColumnName()).setRelation(new Table().setName(statement.getTableName()).setSchema(statement.getCatalogName(), statement.getSchemaName()));
}
protected Column getAffectedNewColumn(RenameColumnStatement statement) {
return new Column().setName(statement.getNewColumnName()).setRelation(new Table().setName(statement.getTableName()).setSchema(statement.getCatalogName(), statement.getSchemaName()));
}
}