package liquibase.sqlgenerator.core;
import liquibase.database.Database;
import liquibase.database.core.MySQLDatabase;
import liquibase.database.core.SQLiteDatabase;
import liquibase.database.core.SybaseASADatabase;
import liquibase.exception.ValidationErrors;
import liquibase.sql.Sql;
import liquibase.sql.UnparsedSql;
import liquibase.sqlgenerator.SqlGeneratorChain;
import liquibase.statement.core.DropForeignKeyConstraintStatement;
import liquibase.structure.core.ForeignKey;
import liquibase.structure.core.Table;
public class DropForeignKeyConstraintGenerator extends AbstractSqlGenerator<DropForeignKeyConstraintStatement> {
@Override
public boolean supports(DropForeignKeyConstraintStatement statement, Database database) {
return (!(database instanceof SQLiteDatabase));
}
@Override
public ValidationErrors validate(DropForeignKeyConstraintStatement dropForeignKeyConstraintStatement, Database database, SqlGeneratorChain sqlGeneratorChain) {
ValidationErrors validationErrors = new ValidationErrors();
validationErrors.checkRequiredField("baseTableName", dropForeignKeyConstraintStatement.getBaseTableName());
validationErrors.checkRequiredField("constraintName", dropForeignKeyConstraintStatement.getConstraintName());
return validationErrors;
}
@Override
public Sql[] generateSql(DropForeignKeyConstraintStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain) {
if (database instanceof MySQLDatabase || database instanceof SybaseASADatabase) {
return new Sql[] { new UnparsedSql("ALTER TABLE " + database.escapeTableName(statement.getBaseTableCatalogName(), statement.getBaseTableSchemaName(), statement.getBaseTableName()) + " DROP FOREIGN KEY " + database.escapeConstraintName(statement.getConstraintName()), getAffectedForeignKey(statement)) };
} else {
return new Sql[] { new UnparsedSql("ALTER TABLE " + database.escapeTableName(statement.getBaseTableCatalogName(), statement.getBaseTableSchemaName(), statement.getBaseTableName()) + " DROP CONSTRAINT " + database.escapeConstraintName(statement.getConstraintName()), getAffectedForeignKey(statement)) };
}
}
protected ForeignKey getAffectedForeignKey(DropForeignKeyConstraintStatement statement) {
return new ForeignKey().setName(statement.getConstraintName()).setForeignKeyTable((Table) new Table().setName(statement.getBaseTableName()).setSchema(statement.getBaseTableCatalogName(), statement.getBaseTableSchemaName()));
}
}