package liquibase.sqlgenerator.core;
import liquibase.database.Database;
import liquibase.database.core.HsqlDatabase;
import liquibase.datatype.LiquibaseDataType;
import liquibase.datatype.core.BooleanType;
import liquibase.datatype.core.CharType;
import liquibase.datatype.core.NumberType;
import liquibase.statement.DatabaseFunction;
import liquibase.statement.SequenceNextValueFunction;
import liquibase.structure.core.Schema;
import liquibase.datatype.DataTypeFactory;
import liquibase.structure.core.Column;
import liquibase.structure.core.Table;
import liquibase.exception.ValidationErrors;
import liquibase.sql.Sql;
import liquibase.sql.UnparsedSql;
import liquibase.sqlgenerator.SqlGeneratorChain;
import liquibase.statement.core.AddDefaultValueStatement;
import javax.management.Query;
public class AddDefaultValueGenerator extends AbstractSqlGenerator<AddDefaultValueStatement> {
@Override
public ValidationErrors validate(AddDefaultValueStatement addDefaultValueStatement, Database database, SqlGeneratorChain sqlGeneratorChain) {
Object defaultValue = addDefaultValueStatement.getDefaultValue();
ValidationErrors validationErrors = new ValidationErrors();
validationErrors.checkRequiredField("defaultValue", defaultValue);
validationErrors.checkRequiredField("columnName", addDefaultValueStatement.getColumnName());
validationErrors.checkRequiredField("tableName", addDefaultValueStatement.getTableName());
if (!database.supportsSequences() && defaultValue instanceof SequenceNextValueFunction) {
validationErrors.addError("Database "+database.getShortName()+" does not support sequences");
}
if (database instanceof HsqlDatabase) {
if (defaultValue instanceof SequenceNextValueFunction) {
validationErrors.addError("Database " + database.getShortName() + " does not support adding sequence-based default values");
} else if (defaultValue instanceof DatabaseFunction) {
validationErrors.addError("Database " + database.getShortName() + " does not support adding function-based default values");
}
}
String columnDataType = addDefaultValueStatement.getColumnDataType();
if (columnDataType != null) {
LiquibaseDataType dataType = DataTypeFactory.getInstance().fromDescription(columnDataType, database);
boolean typeMismatch = false;
if (dataType instanceof BooleanType) {
if (!(defaultValue instanceof Boolean)) {
typeMismatch = true;
}
} else if (dataType instanceof CharType) {
if (!(defaultValue instanceof String)) {
typeMismatch = true;
}
}
if (typeMismatch) {
validationErrors.addError("Default value of "+defaultValue+" does not match defined type of "+columnDataType);
}
}
return validationErrors;
}
@Override
public Sql[] generateSql(AddDefaultValueStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain) {
Object defaultValue = statement.getDefaultValue();
return new Sql[]{
new UnparsedSql("ALTER TABLE " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + " ALTER COLUMN " + database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getColumnName()) + " SET DEFAULT " + DataTypeFactory.getInstance().fromObject(defaultValue, database).objectToSql(defaultValue, database),
getAffectedColumn(statement))
};
}
protected Column getAffectedColumn(AddDefaultValueStatement statement) {
return new Column()
.setRelation(new Table().setName(statement.getTableName()).setSchema(new Schema(statement.getCatalogName(), statement.getSchemaName())))
.setName(statement.getColumnName());
}
}