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ModifyDataTypeGenerator.java
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ModifyDataTypeGenerator.java
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package liquibase.sqlgenerator.core;
import liquibase.database.Database;
import liquibase.database.core.*;
import liquibase.datatype.DataTypeFactory;
import liquibase.datatype.DatabaseDataType;
import liquibase.exception.ValidationErrors;
import liquibase.exception.Warnings;
import liquibase.sql.Sql;
import liquibase.sql.UnparsedSql;
import liquibase.sqlgenerator.SqlGeneratorChain;
import liquibase.statement.core.ModifyDataTypeStatement;
import liquibase.structure.core.Relation;
import liquibase.structure.core.Table;
public class ModifyDataTypeGenerator extends AbstractSqlGenerator<ModifyDataTypeStatement> {
@Override
public boolean supports(ModifyDataTypeStatement statement, Database database) {
if (database instanceof SQLiteDatabase || database instanceof Db2zDatabase) {
return false;
}
return super.supports(statement, database);
}
@Override
public Warnings warn(ModifyDataTypeStatement modifyDataTypeStatement, Database database, SqlGeneratorChain sqlGeneratorChain) {
Warnings warnings = super.warn(modifyDataTypeStatement, database, sqlGeneratorChain);
if (database instanceof MySQLDatabase) {
((MySQLDatabase) database).warnAboutAlterColumn("modifyDataType", warnings);
}
return warnings;
}
@Override
public ValidationErrors validate(ModifyDataTypeStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain) {
ValidationErrors validationErrors = new ValidationErrors();
validationErrors.checkRequiredField("tableName", statement.getTableName());
validationErrors.checkRequiredField("columnName", statement.getColumnName());
validationErrors.checkRequiredField("newDataType", statement.getNewDataType());
return validationErrors;
}
@Override
public Sql[] generateSql(ModifyDataTypeStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain) {
String alterTable = "ALTER TABLE " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName());
// add "MODIFY"
alterTable += " " + getModifyString(database) + " ";
// add column name
String columnName = database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getColumnName());
alterTable += columnName;
alterTable += getPreDataTypeString(database); // adds a space if nothing else
// add column type
DatabaseDataType newDataType = DataTypeFactory.getInstance().fromDescription(statement.getNewDataType(), database).toDatabaseDataType(database);
alterTable += newDataType;
if (database instanceof PostgresDatabase) {
alterTable += " USING ("+columnName+"::"+newDataType+")";
}
return new Sql[]{new UnparsedSql(alterTable, getAffectedTable(statement))};
}
protected Relation getAffectedTable(ModifyDataTypeStatement statement) {
return new Table().setName(statement.getTableName()).setSchema(statement.getCatalogName(), statement.getSchemaName());
}
/**
* @return either "MODIFY" or "ALTER COLUMN" depending on the current db
*/
protected String getModifyString(Database database) {
if ((database instanceof SybaseASADatabase) || (database instanceof SybaseDatabase) || (database instanceof
MySQLDatabase) || (database instanceof OracleDatabase) || (database instanceof InformixDatabase)
) {
return "MODIFY";
} else {
return "ALTER COLUMN";
}
}
/**
* @return the string that comes before the column type
* definition (like 'set data type' for derby or an open parentheses for Oracle)
*/
protected String getPreDataTypeString(Database database) {
if ((database instanceof DerbyDatabase) || (database instanceof AbstractDb2Database)) {
return " SET DATA TYPE ";
} else if ((database instanceof SybaseASADatabase) || (database instanceof SybaseDatabase) || (database
instanceof MSSQLDatabase) || (database instanceof MySQLDatabase) || (database instanceof HsqlDatabase) ||
(database instanceof H2Database) || (database instanceof OracleDatabase) || (database instanceof
InformixDatabase)) {
return " ";
} else {
return " TYPE ";
}
}
}