package liquibase.sqlgenerator.core;
import liquibase.database.Database;
import liquibase.database.core.*;
import liquibase.exception.ValidationErrors;
import liquibase.logging.LogFactory;
import liquibase.sql.Sql;
import liquibase.sql.UnparsedSql;
import liquibase.sqlgenerator.SqlGenerator;
import liquibase.sqlgenerator.SqlGeneratorChain;
import liquibase.statement.core.DropTableStatement;
import liquibase.structure.core.Relation;
import liquibase.structure.core.Table;
public class DropTableGenerator extends AbstractSqlGenerator<DropTableStatement> {
@Override
public ValidationErrors validate(DropTableStatement dropTableStatement, Database database, SqlGeneratorChain sqlGeneratorChain) {
ValidationErrors validationErrors = new ValidationErrors();
validationErrors.checkRequiredField("tableName", dropTableStatement.getTableName());
return validationErrors;
}
@Override
public Sql[] generateSql(DropTableStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain) {
StringBuffer buffer = new StringBuffer();
buffer.append("DROP TABLE ").append(database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()));
if (statement.isCascadeConstraints()) {
if (!database.supportsDropTableCascadeConstraints()) {
LogFactory.getLogger().warning("Database does not support drop with cascade");
} else if (database instanceof OracleDatabase) {
buffer.append(" CASCADE CONSTRAINTS");
} else {
buffer.append(" CASCADE");
}
}
return new Sql[]{
new UnparsedSql(buffer.toString(), getAffectedTable(statement))
};
}
protected Relation getAffectedTable(DropTableStatement statement) {
return new Table().setName(statement.getTableName()).setSchema(statement.getCatalogName(), statement.getSchemaName());
}
}