package liquibase.sqlgenerator.core;
import liquibase.change.ColumnConfig;
import liquibase.database.Database;
import liquibase.database.core.*;
import liquibase.exception.ValidationErrors;
import liquibase.sql.Sql;
import liquibase.sql.UnparsedSql;
import liquibase.sqlgenerator.SqlGenerator;
import liquibase.sqlgenerator.SqlGeneratorChain;
import liquibase.statement.core.DropUniqueConstraintStatement;
import liquibase.structure.core.Column;
import liquibase.structure.core.Table;
import liquibase.structure.core.UniqueConstraint;
import liquibase.util.StringUtils;
public class DropUniqueConstraintGenerator extends AbstractSqlGenerator<DropUniqueConstraintStatement> {
@Override
public boolean supports(DropUniqueConstraintStatement statement, Database database) {
return !(database instanceof SQLiteDatabase);
}
@Override
public ValidationErrors validate(DropUniqueConstraintStatement dropUniqueConstraintStatement, Database database, SqlGeneratorChain sqlGeneratorChain) {
ValidationErrors validationErrors = new ValidationErrors();
validationErrors.checkRequiredField("tableName", dropUniqueConstraintStatement.getTableName());
validationErrors.checkRequiredField("constraintName", dropUniqueConstraintStatement.getConstraintName());
return validationErrors;
}
@Override
public Sql[] generateSql(DropUniqueConstraintStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain) {
String sql;
if (database instanceof MySQLDatabase) {
sql = "ALTER TABLE " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + " DROP KEY " + database.escapeConstraintName(statement.getConstraintName());
} else if (database instanceof OracleDatabase) {
sql = "ALTER TABLE " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + " DROP CONSTRAINT " + database.escapeConstraintName(statement.getConstraintName()) + " DROP INDEX";
} else if (database instanceof SybaseASADatabase) {
sql = "ALTER TABLE " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + " DROP UNIQUE (" + statement.getUniqueColumns() + ")";
} else {
sql = "ALTER TABLE " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + " DROP CONSTRAINT " + database.escapeConstraintName(statement.getConstraintName());
}
return new Sql[] {
new UnparsedSql(sql, getAffectedUniqueConstraint(statement))
};
}
protected UniqueConstraint getAffectedUniqueConstraint(DropUniqueConstraintStatement statement) {
UniqueConstraint constraint = new UniqueConstraint().setName(statement.getConstraintName()).setTable((Table) new Table().setName(statement.getTableName()).setSchema(statement.getCatalogName(), statement.getSchemaName()));
if (statement.getUniqueColumns() != null) {
int i = 0;
for (ColumnConfig column : statement.getUniqueColumns()) {
constraint.addColumn(i++, new Column(column));
}
}
return constraint;
}
}